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< div class = "headertitle" > < div class = "title" > Sudoku solver< / div > < / div >
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Data Structures< / h2 > < / td > < / tr >
< tr class = "memitem:" > < td class = "memItemLeft" align = "right" valign = "top" > struct   < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > < / td > < / tr >
< tr class = "memdesc:" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Structure to hold the matrix and dimensions. < a href = "../../dc/d18/structsudoku.html#details" > More...< / a > < br / > < / td > < / tr >
< tr class = "separator:" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< / table > < table class = "memberdecls" >
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Functions< / h2 > < / td > < / tr >
< tr class = "memitem:ga85d25d3b40017436f264a103685e4c55" > < td class = "memItemLeft" align = "right" valign = "top" > bool  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../d5/df4/group__sudoku.html#ga85d25d3b40017436f264a103685e4c55" > OKrow< / a > (const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *a, int x, int y, int v)< / td > < / tr >
< tr class = "memdesc:ga85d25d3b40017436f264a103685e4c55" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Check if < code > x< / code > ^th row is valid. < a href = "../../d5/df4/group__sudoku.html#ga85d25d3b40017436f264a103685e4c55" > More...< / a > < br / > < / td > < / tr >
< tr class = "separator:ga85d25d3b40017436f264a103685e4c55" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< tr class = "memitem:ga6503128d4f5ce0a0826f72f73f9e0b2a" > < td class = "memItemLeft" align = "right" valign = "top" > bool  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../d5/df4/group__sudoku.html#ga6503128d4f5ce0a0826f72f73f9e0b2a" > OKcol< / a > (const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *a, int x, int y, int v)< / td > < / tr >
< tr class = "memdesc:ga6503128d4f5ce0a0826f72f73f9e0b2a" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Check if < code > y< / code > ^th column is valid. < a href = "../../d5/df4/group__sudoku.html#ga6503128d4f5ce0a0826f72f73f9e0b2a" > More...< / a > < br / > < / td > < / tr >
< tr class = "separator:ga6503128d4f5ce0a0826f72f73f9e0b2a" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< tr class = "memitem:ga1cd43df3f4187845ce186042fe53e6f1" > < td class = "memItemLeft" align = "right" valign = "top" > bool  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../d5/df4/group__sudoku.html#ga1cd43df3f4187845ce186042fe53e6f1" > OKbox< / a > (const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *a, int x, int y, int v)< / td > < / tr >
< tr class = "memdesc:ga1cd43df3f4187845ce186042fe53e6f1" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Check if a 3x3 box is valid. < a href = "../../d5/df4/group__sudoku.html#ga1cd43df3f4187845ce186042fe53e6f1" > More...< / a > < br / > < / td > < / tr >
< tr class = "separator:ga1cd43df3f4187845ce186042fe53e6f1" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< tr class = "memitem:ga3a0ec150ac9d0cb6b28279d36d95d72f" > < td class = "memItemLeft" align = "right" valign = "top" > bool  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../d5/df4/group__sudoku.html#ga3a0ec150ac9d0cb6b28279d36d95d72f" > OK< / a > (const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *a, int x, int y, int v)< / td > < / tr >
< tr class = "memdesc:ga3a0ec150ac9d0cb6b28279d36d95d72f" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Check if element < code > v< / code > is valid to place at (x,y) location. < a href = "../../d5/df4/group__sudoku.html#ga3a0ec150ac9d0cb6b28279d36d95d72f" > More...< / a > < br / > < / td > < / tr >
< tr class = "separator:ga3a0ec150ac9d0cb6b28279d36d95d72f" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< tr class = "memitem:ga702ff4f95dde780c7d04fcdd1021b6c1" > < td class = "memItemLeft" align = "right" valign = "top" > void  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../d5/df4/group__sudoku.html#ga702ff4f95dde780c7d04fcdd1021b6c1" > print< / a > (const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *a)< / td > < / tr >
< tr class = "memdesc:ga702ff4f95dde780c7d04fcdd1021b6c1" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Print the matrix to stdout. < a href = "../../d5/df4/group__sudoku.html#ga702ff4f95dde780c7d04fcdd1021b6c1" > More...< / a > < br / > < / td > < / tr >
< tr class = "separator:ga702ff4f95dde780c7d04fcdd1021b6c1" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< tr class = "memitem:ga62e94fc39f116e2c81daed8f5437431b" > < td class = "memItemLeft" align = "right" valign = "top" > bool  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../d5/df4/group__sudoku.html#ga62e94fc39f116e2c81daed8f5437431b" > get_next_unknown< / a > (const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *a, int *x, int *y)< / td > < / tr >
< tr class = "memdesc:ga62e94fc39f116e2c81daed8f5437431b" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Find and get the location for next empty cell. < a href = "../../d5/df4/group__sudoku.html#ga62e94fc39f116e2c81daed8f5437431b" > More...< / a > < br / > < / td > < / tr >
< tr class = "separator:ga62e94fc39f116e2c81daed8f5437431b" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< tr class = "memitem:gadfe0ed5085b4775d8fa00b434cc0fdfc" > < td class = "memItemLeft" align = "right" valign = "top" > bool  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../d5/df4/group__sudoku.html#gadfe0ed5085b4775d8fa00b434cc0fdfc" > solve< / a > (struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *a)< / td > < / tr >
< tr class = "memdesc:gadfe0ed5085b4775d8fa00b434cc0fdfc" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Function to solve a partially filled sudoku matrix. < a href = "../../d5/df4/group__sudoku.html#gadfe0ed5085b4775d8fa00b434cc0fdfc" > More...< / a > < br / > < / td > < / tr >
< tr class = "separator:gadfe0ed5085b4775d8fa00b434cc0fdfc" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< / table >
< a name = "details" id = "details" > < / a > < h2 class = "groupheader" > Detailed Description< / h2 >
< h2 class = "groupheader" > Function Documentation< / h2 >
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< a id = "ga62e94fc39f116e2c81daed8f5437431b" name = "ga62e94fc39f116e2c81daed8f5437431b" > < / a >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ga62e94fc39f116e2c81daed8f5437431b" > ◆   < / a > < / span > get_next_unknown()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > bool get_next_unknown < / td >
< td > (< / td >
< td class = "paramtype" > const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *  < / td >
< td class = "paramname" > < em > a< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int *  < / td >
< td class = "paramname" > < em > x< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int *  < / td >
< td class = "paramname" > < em > y< / em >   < / td >
< / tr >
< tr >
< td > < / td >
< td > )< / td >
< td > < / td > < td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
< p > Find and get the location for next empty cell. < / p >
< dl class = "params" > < dt > Parameters< / dt > < dd >
< table class = "params" >
< tr > < td class = "paramdir" > [in]< / td > < td class = "paramname" > a< / td > < td > pointer to sudoku instance < / td > < / tr >
< tr > < td class = "paramdir" > [out]< / td > < td class = "paramname" > x< / td > < td > pointer to row index of next unknown < / td > < / tr >
< tr > < td class = "paramdir" > [out]< / td > < td class = "paramname" > y< / td > < td > pointer to column index of next unknown < / td > < / tr >
< / table >
< / dd >
< / dl >
< dl class = "section return" > < dt > Returns< / dt > < dd > < code > true< / code > if an empty location was found < / dd >
< dd >
< code > false< / code > if no more empty locations found < / dd > < / dl >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 145< / span > {< / div >
< div class = "line" > < span class = "lineno" > 146< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < a-> N; i++)< / div >
< div class = "line" > < span class = "lineno" > 147< / span > {< / div >
< div class = "line" > < span class = "lineno" > 148< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > j = 0; j < a-> N; j++)< / div >
< div class = "line" > < span class = "lineno" > 149< / span > {< / div >
< div class = "line" > < span class = "lineno" > 150< / span > < span class = "keywordflow" > if< / span > (a-> a[i * a-> N + j] == 0)< / div >
< div class = "line" > < span class = "lineno" > 151< / span > {< / div >
< div class = "line" > < span class = "lineno" > 152< / span > *x = i;< / div >
< div class = "line" > < span class = "lineno" > 153< / span > *y = j;< / div >
< div class = "line" > < span class = "lineno" > 154< / span > < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 155< / span > }< / div >
< div class = "line" > < span class = "lineno" > 156< / span > }< / div >
< div class = "line" > < span class = "lineno" > 157< / span > }< / div >
< div class = "line" > < span class = "lineno" > 158< / span > < / div >
< div class = "line" > < span class = "lineno" > 159< / span > < span class = "comment" > /* no unknown locations found */< / span > < / div >
< div class = "line" > < span class = "lineno" > 160< / span > < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 161< / span > }< / div >
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< / div > <!-- fragment -->
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< / div >
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< a id = "ga3a0ec150ac9d0cb6b28279d36d95d72f" name = "ga3a0ec150ac9d0cb6b28279d36d95d72f" > < / a >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ga3a0ec150ac9d0cb6b28279d36d95d72f" > ◆   < / a > < / span > OK()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > bool OK < / td >
< td > (< / td >
< td class = "paramtype" > const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *  < / td >
< td class = "paramname" > < em > a< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > x< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > y< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > v< / em >   < / td >
< / tr >
< tr >
< td > < / td >
< td > )< / td >
< td > < / td > < td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
< p > Check if element < code > v< / code > is valid to place at (x,y) location. < / p >
< dl class = "params" > < dt > Parameters< / dt > < dd >
< table class = "params" >
< tr > < td class = "paramname" > a< / td > < td > < a class = "el" href = "../../dc/d18/structsudoku.html" title = "Structure to hold the matrix and dimensions." > sudoku< / a > to check < / td > < / tr >
< tr > < td class = "paramname" > x< / td > < td > row to place value < / td > < / tr >
< tr > < td class = "paramname" > y< / td > < td > column to place value < / td > < / tr >
< tr > < td class = "paramname" > v< / td > < td > value to check if it is valid < / td > < / tr >
< / table >
< / dd >
< / dl >
< dl class = "section return" > < dt > Returns< / dt > < dd > < code > true< / code > if valid < / dd >
< dd >
< code > false< / code > if in-valid < / dd > < / dl >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 112< / span > {< / div >
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< div class = "line" > < span class = "lineno" > 114< / span > < span class = "keywordflow" > if< / span > (result)< / div >
< div class = "line" > < span class = "lineno" > 115< / span > result = < a class = "code hl_function" href = "../../d5/df4/group__sudoku.html#ga6503128d4f5ce0a0826f72f73f9e0b2a" > OKcol< / a > (a, x, y, v);< / div >
< div class = "line" > < span class = "lineno" > 116< / span > < span class = "keywordflow" > if< / span > (result)< / div >
< div class = "line" > < span class = "lineno" > 117< / span > result = < a class = "code hl_function" href = "../../d5/df4/group__sudoku.html#ga1cd43df3f4187845ce186042fe53e6f1" > OKbox< / a > (a, x, y, v);< / div >
< div class = "line" > < span class = "lineno" > 118< / span > < / div >
< div class = "line" > < span class = "lineno" > 119< / span > < span class = "keywordflow" > return< / span > result;< / div >
< div class = "line" > < span class = "lineno" > 120< / span > }< / div >
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< div class = "ttc" id = "agroup__sudoku_html_ga1cd43df3f4187845ce186042fe53e6f1" > < div class = "ttname" > < a href = "../../d5/df4/group__sudoku.html#ga1cd43df3f4187845ce186042fe53e6f1" > OKbox< / a > < / div > < div class = "ttdeci" > bool OKbox(const struct sudoku *a, int x, int y, int v)< / div > < div class = "ttdoc" > Check if a 3x3 box is valid.< / div > < div class = "ttdef" > < b > Definition:< / b > sudoku_solver.c:85< / div > < / div >
< div class = "ttc" id = "agroup__sudoku_html_ga6503128d4f5ce0a0826f72f73f9e0b2a" > < div class = "ttname" > < a href = "../../d5/df4/group__sudoku.html#ga6503128d4f5ce0a0826f72f73f9e0b2a" > OKcol< / a > < / div > < div class = "ttdeci" > bool OKcol(const struct sudoku *a, int x, int y, int v)< / div > < div class = "ttdoc" > Check if y^th column is valid.< / div > < div class = "ttdef" > < b > Definition:< / b > sudoku_solver.c:67< / div > < / div >
< div class = "ttc" id = "agroup__sudoku_html_ga85d25d3b40017436f264a103685e4c55" > < div class = "ttname" > < a href = "../../d5/df4/group__sudoku.html#ga85d25d3b40017436f264a103685e4c55" > OKrow< / a > < / div > < div class = "ttdeci" > bool OKrow(const struct sudoku *a, int x, int y, int v)< / div > < div class = "ttdoc" > Check if x^th row is valid.< / div > < div class = "ttdef" > < b > Definition:< / b > sudoku_solver.c:48< / div > < / div >
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< / div > <!-- fragment --> < div class = "dynheader" >
Here is the call graph for this function:< / div >
< div class = "dyncontent" >
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< div class = "center" > < iframe scrolling = "no" frameborder = "0" src = "../../d5/df4/group__sudoku_ga3a0ec150ac9d0cb6b28279d36d95d72f_cgraph.svg" width = "163" height = "135" > < p > < b > This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.< / b > < / p > < / iframe >
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< / div >
< / div >
< / div >
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< a id = "ga1cd43df3f4187845ce186042fe53e6f1" name = "ga1cd43df3f4187845ce186042fe53e6f1" > < / a >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ga1cd43df3f4187845ce186042fe53e6f1" > ◆   < / a > < / span > OKbox()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > bool OKbox < / td >
< td > (< / td >
< td class = "paramtype" > const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *  < / td >
< td class = "paramname" > < em > a< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > x< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > y< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > v< / em >   < / td >
< / tr >
< tr >
< td > < / td >
< td > )< / td >
< td > < / td > < td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
< p > Check if a 3x3 box is valid. < / p >
< dl class = "params" > < dt > Parameters< / dt > < dd >
< table class = "params" >
< tr > < td class = "paramname" > a< / td > < td > matrix to check < / td > < / tr >
< tr > < td class = "paramname" > x< / td > < td > row index of the element to check < / td > < / tr >
< tr > < td class = "paramname" > y< / td > < td > column index of the element to check < / td > < / tr >
< tr > < td class = "paramname" > v< / td > < td > value to check if it repeats < / td > < / tr >
< / table >
< / dd >
< / dl >
< dl class = "section return" > < dt > Returns< / dt > < dd > < code > true< / code > if valid < / dd >
< dd >
< code > false< / code > if in-valid < / dd > < / dl >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 86< / span > {< / div >
< div class = "line" > < span class = "lineno" > 87< / span > < span class = "comment" > /* get start indices of the box that the current (x,y) lies in< / span > < / div >
< div class = "line" > < span class = "lineno" > 88< / span > < span class = "comment" > remember that in C/C++, division operation always rounds towards< / span > < / div >
< div class = "line" > < span class = "lineno" > 89< / span > < span class = "comment" > -infinity for signed integers and towards 0 for unsigned integers< / span > < / div >
< div class = "line" > < span class = "lineno" > 90< / span > < span class = "comment" > */< / span > < / div >
< div class = "line" > < span class = "lineno" > 91< / span > < span class = "keywordtype" > int< / span > bi = x - x % a-> N2, bj = y - y % a-> N2;< / div >
< div class = "line" > < span class = "lineno" > 92< / span > < span class = "comment" > // printf(" Checking box: (%d,%d)\n" , bi, bj);< / span > < / div >
< div class = "line" > < span class = "lineno" > 93< / span > < / div >
< div class = "line" > < span class = "lineno" > 94< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = bi; i < (bi + a-> N2); i++)< / div >
< div class = "line" > < span class = "lineno" > 95< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > j = bj; j < (bj + a-> N2); j++)< / div >
< div class = "line" > < span class = "lineno" > 96< / span > < span class = "keywordflow" > if< / span > (a-> a[i * a-> N + j] == v)< / div >
< div class = "line" > < span class = "lineno" > 97< / span > < span class = "comment" > // if the value is found in the box< / span > < / div >
< div class = "line" > < span class = "lineno" > 98< / span > < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 99< / span > < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 100< / span > }< / div >
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< / div > <!-- fragment -->
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< a id = "ga6503128d4f5ce0a0826f72f73f9e0b2a" name = "ga6503128d4f5ce0a0826f72f73f9e0b2a" > < / a >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ga6503128d4f5ce0a0826f72f73f9e0b2a" > ◆   < / a > < / span > OKcol()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > bool OKcol < / td >
< td > (< / td >
< td class = "paramtype" > const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *  < / td >
< td class = "paramname" > < em > a< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > x< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > y< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > v< / em >   < / td >
< / tr >
< tr >
< td > < / td >
< td > )< / td >
< td > < / td > < td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
< p > Check if < code > y< / code > ^th column is valid. < / p >
< dl class = "params" > < dt > Parameters< / dt > < dd >
< table class = "params" >
< tr > < td class = "paramname" > a< / td > < td > < a class = "el" href = "../../dc/d18/structsudoku.html" title = "Structure to hold the matrix and dimensions." > sudoku< / a > to check < / td > < / tr >
< tr > < td class = "paramname" > x< / td > < td > ignored row < / td > < / tr >
< tr > < td class = "paramname" > y< / td > < td > column to check < / td > < / tr >
< tr > < td class = "paramname" > v< / td > < td > value to check if it repeats < / td > < / tr >
< / table >
< / dd >
< / dl >
< dl class = "section return" > < dt > Returns< / dt > < dd > < code > true< / code > if valid < / dd >
< dd >
< code > false< / code > if in-valid < / dd > < / dl >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 68< / span > {< / div >
< div class = "line" > < span class = "lineno" > 69< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < a-> N; i++)< / div >
< div class = "line" > < span class = "lineno" > 70< / span > < span class = "keywordflow" > if< / span > (a-> a[i * a-> N + y] == v)< / div >
< div class = "line" > < span class = "lineno" > 71< / span > < span class = "comment" > // if the value is found in the column< / span > < / div >
< div class = "line" > < span class = "lineno" > 72< / span > < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 73< / span > < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 74< / span > }< / div >
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< a id = "ga85d25d3b40017436f264a103685e4c55" name = "ga85d25d3b40017436f264a103685e4c55" > < / a >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ga85d25d3b40017436f264a103685e4c55" > ◆   < / a > < / span > OKrow()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > bool OKrow < / td >
< td > (< / td >
< td class = "paramtype" > const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *  < / td >
< td class = "paramname" > < em > a< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > x< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > y< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > v< / em >   < / td >
< / tr >
< tr >
< td > < / td >
< td > )< / td >
< td > < / td > < td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
< p > Check if < code > x< / code > ^th row is valid. < / p >
< dl class = "params" > < dt > Parameters< / dt > < dd >
< table class = "params" >
< tr > < td class = "paramname" > a< / td > < td > < a class = "el" href = "../../dc/d18/structsudoku.html" title = "Structure to hold the matrix and dimensions." > sudoku< / a > to check < / td > < / tr >
< tr > < td class = "paramname" > x< / td > < td > row to check < / td > < / tr >
< tr > < td class = "paramname" > y< / td > < td > ignored column < / td > < / tr >
< tr > < td class = "paramname" > v< / td > < td > value to check if it repeats < / td > < / tr >
< / table >
< / dd >
< / dl >
< dl class = "section return" > < dt > Returns< / dt > < dd > < code > true< / code > if valid < / dd >
< dd >
< code > false< / code > if in-valid < / dd > < / dl >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 49< / span > {< / div >
< div class = "line" > < span class = "lineno" > 50< / span > < span class = "keywordtype" > int< / span > offset = x * a-> N;< / div >
< div class = "line" > < span class = "lineno" > 51< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > j = 0; j < a-> N; j++)< / div >
< div class = "line" > < span class = "lineno" > 52< / span > < span class = "keywordflow" > if< / span > (a-> a[offset + j] == v)< / div >
< div class = "line" > < span class = "lineno" > 53< / span > < span class = "comment" > // if the value is found in the row< / span > < / div >
< div class = "line" > < span class = "lineno" > 54< / span > < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 55< / span > < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 56< / span > }< / div >
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< a id = "ga702ff4f95dde780c7d04fcdd1021b6c1" name = "ga702ff4f95dde780c7d04fcdd1021b6c1" > < / a >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ga702ff4f95dde780c7d04fcdd1021b6c1" > ◆   < / a > < / span > print()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > void print < / td >
< td > (< / td >
< td class = "paramtype" > const struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *  < / td >
< td class = "paramname" > < em > a< / em > < / td > < td > )< / td >
< td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
< p > Print the matrix to stdout. < / p >
< dl class = "params" > < dt > Parameters< / dt > < dd >
< table class = "params" >
< tr > < td class = "paramdir" > [in]< / td > < td class = "paramname" > a< / td > < td > array to print < / td > < / tr >
< / table >
< / dd >
< / dl >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 127< / span > {< / div >
< div class = "line" > < span class = "lineno" > 128< / span > < span class = "keywordtype" > int< / span > i, j;< / div >
< div class = "line" > < span class = "lineno" > 129< / span > < span class = "keywordflow" > for< / span > (i = 0; i < a-> N; i++)< / div >
< div class = "line" > < span class = "lineno" > 130< / span > < span class = "keywordflow" > for< / span > (j = 0; j < a-> N; j++)< / div >
< div class = "line" > < span class = "lineno" > 131< / span > printf(< span class = "stringliteral" > " %" < / span > SCNu8 < span class = "stringliteral" > " %c" < / span > , a-> a[i * a-> N + j],< / div >
< div class = "line" > < span class = "lineno" > 132< / span > (j == a-> N - 1 ? < span class = "charliteral" > ' \n' < / span > : < span class = "charliteral" > ' ' < / span > ));< / div >
< div class = "line" > < span class = "lineno" > 133< / span > }< / div >
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< / div >
< / div >
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< a id = "gadfe0ed5085b4775d8fa00b434cc0fdfc" name = "gadfe0ed5085b4775d8fa00b434cc0fdfc" > < / a >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#gadfe0ed5085b4775d8fa00b434cc0fdfc" > ◆   < / a > < / span > solve()< / h2 >
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< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > bool solve < / td >
< td > (< / td >
< td class = "paramtype" > struct < a class = "el" href = "../../dc/d18/structsudoku.html" > sudoku< / a > *  < / td >
< td class = "paramname" > < em > a< / em > < / td > < td > )< / td >
< td > < / td >
< / tr >
< / table >
< / div > < div class = "memdoc" >
< p > Function to solve a partially filled sudoku matrix. < / p >
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< p > For each unknown value (0), the function fills a possible value and calls the function again to check forvalid solution.< / p >
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< dl class = "params" > < dt > Parameters< / dt > < dd >
< table class = "params" >
< tr > < td class = "paramdir" > [in,out]< / td > < td class = "paramname" > a< / td > < td > sudoku matrix to solve < / td > < / tr >
< / table >
< / dd >
< / dl >
< dl class = "section return" > < dt > Returns< / dt > < dd > < code > true< / code > if solution found < / dd >
< dd >
< code > false< / code > if no solution found < / dd > < / dl >
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< div class = "fragment" > < div class = "line" > < span class = "lineno" > 173< / span > {< / div >
< div class = "line" > < span class = "lineno" > 174< / span > < span class = "keyword" > static< / span > uint32_t counter = 0;< / div >
< div class = "line" > < span class = "lineno" > 175< / span > < span class = "keywordtype" > int< / span > i, j;< / div >
< div class = "line" > < span class = "lineno" > 176< / span > < span class = "keyword" > static< / span > < span class = "keywordtype" > char< / span > prefix[100] = < span class = "stringliteral" > " " < / span > ; < span class = "comment" > // enough memory< / span > < / div >
< div class = "line" > < span class = "lineno" > 177< / span > < / div >
< div class = "line" > < span class = "lineno" > 178< / span > < span class = "keywordflow" > if< / span > (!< a class = "code hl_function" href = "../../d5/df4/group__sudoku.html#ga62e94fc39f116e2c81daed8f5437431b" > get_next_unknown< / a > (a, & i, & j))< / div >
< div class = "line" > < span class = "lineno" > 179< / span > {< / div >
< div class = "line" > < span class = "lineno" > 180< / span > < span class = "comment" > /* no more empty location found< / span > < / div >
< div class = "line" > < span class = "lineno" > 181< / span > < span class = "comment" > implies all good in the matrix< / span > < / div >
< div class = "line" > < span class = "lineno" > 182< / span > < span class = "comment" > */< / span > < / div >
< div class = "line" > < span class = "lineno" > 183< / span > < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 184< / span > }< / div >
< div class = "line" > < span class = "lineno" > 185< / span > < / div >
< div class = "line" > < span class = "lineno" > 186< / span > < span class = "comment" > /* try all possible values for the unknown */< / span > < / div >
< div class = "line" > < span class = "lineno" > 187< / span > < span class = "keywordflow" > for< / span > (uint8_t v = 1; v < = a-> N; v++)< / div >
< div class = "line" > < span class = "lineno" > 188< / span > { < span class = "comment" > /* try all possible values 1 thru N */< / span > < / div >
< div class = "line" > < span class = "lineno" > 189< / span > printf(< span class = "stringliteral" > " %sTry (%d,%d) = %" < / span > SCNu8 < span class = "stringliteral" > " ... " < / span > , prefix, i, j, v);< / div >
< div class = "line" > < span class = "lineno" > 190< / span > counter++;< / div >
< div class = "line" > < span class = "lineno" > 191< / span > < span class = "keywordflow" > if< / span > (< a class = "code hl_function" href = "../../d5/df4/group__sudoku.html#ga3a0ec150ac9d0cb6b28279d36d95d72f" > OK< / a > (a, i, j, v))< / div >
< div class = "line" > < span class = "lineno" > 192< / span > {< / div >
< div class = "line" > < span class = "lineno" > 193< / span > < span class = "comment" > /* if assignment checks satisfy, set the value and< / span > < / div >
< div class = "line" > < span class = "lineno" > 194< / span > < span class = "comment" > continue with remaining elements */< / span > < / div >
< div class = "line" > < span class = "lineno" > 195< / span > printf(< span class = "stringliteral" > " passed (counter=%" < / span > SCNu32 < span class = "stringliteral" > " )\n" < / span > , counter);< / div >
< div class = "line" > < span class = "lineno" > 196< / span > a-> a[i * a-> N + j] = v;< / div >
< div class = "line" > < span class = "lineno" > 197< / span > strcat(prefix, < span class = "stringliteral" > " " < / span > );< / div >
< div class = "line" > < span class = "lineno" > 198< / span > < span class = "keywordflow" > if< / span > (< a class = "code hl_function" href = "../../d5/df4/group__sudoku.html#gadfe0ed5085b4775d8fa00b434cc0fdfc" > solve< / a > (a))< / div >
< div class = "line" > < span class = "lineno" > 199< / span > {< / div >
< div class = "line" > < span class = "lineno" > 200< / span > < span class = "comment" > /* solution found */< / span > < / div >
< div class = "line" > < span class = "lineno" > 201< / span > < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 202< / span > }< / div >
< div class = "line" > < span class = "lineno" > 203< / span > < / div >
< div class = "line" > < span class = "lineno" > 204< / span > printf(< span class = "stringliteral" > " %sBacktrack (%d,%d) < - %" < / span > SCNu8 < span class = "stringliteral" > " (counter=%" < / span > SCNu32 < span class = "stringliteral" > " )\n" < / span > ,< / div >
< div class = "line" > < span class = "lineno" > 205< / span > prefix, i, j, a-> a[i * a-> N + j], counter);< / div >
< div class = "line" > < span class = "lineno" > 206< / span > < / div >
< div class = "line" > < span class = "lineno" > 207< / span > prefix[strlen(prefix) - 2] = < span class = "charliteral" > ' \0' < / span > ; < span class = "comment" > // truncate the prefix< / span > < / div >
< div class = "line" > < span class = "lineno" > 208< / span > a-> a[i * a-> N + j] = 0;< / div >
< div class = "line" > < span class = "lineno" > 209< / span > }< / div >
< div class = "line" > < span class = "lineno" > 210< / span > < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < span class = "lineno" > 211< / span > {< / div >
< div class = "line" > < span class = "lineno" > 212< / span > printf(< span class = "stringliteral" > " \r" < / span > );< / div >
< div class = "line" > < span class = "lineno" > 213< / span > }< / div >
< div class = "line" > < span class = "lineno" > 214< / span > }< / div >
< div class = "line" > < span class = "lineno" > 215< / span > < / div >
< div class = "line" > < span class = "lineno" > 216< / span > < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < span class = "lineno" > 217< / span > }< / div >
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< div class = "ttc" id = "agroup__sudoku_html_ga3a0ec150ac9d0cb6b28279d36d95d72f" > < div class = "ttname" > < a href = "../../d5/df4/group__sudoku.html#ga3a0ec150ac9d0cb6b28279d36d95d72f" > OK< / a > < / div > < div class = "ttdeci" > bool OK(const struct sudoku *a, int x, int y, int v)< / div > < div class = "ttdoc" > Check if element v is valid to place at (x,y) location.< / div > < div class = "ttdef" > < b > Definition:< / b > sudoku_solver.c:111< / div > < / div >
< div class = "ttc" id = "agroup__sudoku_html_ga62e94fc39f116e2c81daed8f5437431b" > < div class = "ttname" > < a href = "../../d5/df4/group__sudoku.html#ga62e94fc39f116e2c81daed8f5437431b" > get_next_unknown< / a > < / div > < div class = "ttdeci" > bool get_next_unknown(const struct sudoku *a, int *x, int *y)< / div > < div class = "ttdoc" > Find and get the location for next empty cell.< / div > < div class = "ttdef" > < b > Definition:< / b > sudoku_solver.c:144< / div > < / div >
< div class = "ttc" id = "agroup__sudoku_html_gadfe0ed5085b4775d8fa00b434cc0fdfc" > < div class = "ttname" > < a href = "../../d5/df4/group__sudoku.html#gadfe0ed5085b4775d8fa00b434cc0fdfc" > solve< / a > < / div > < div class = "ttdeci" > bool solve(struct sudoku *a)< / div > < div class = "ttdoc" > Function to solve a partially filled sudoku matrix.< / div > < div class = "ttdef" > < b > Definition:< / b > sudoku_solver.c:172< / div > < / div >
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< / div > <!-- fragment --> < div class = "dynheader" >
Here is the call graph for this function:< / div >
< div class = "dyncontent" >
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< div class = "center" > < iframe scrolling = "no" frameborder = "0" src = "../../d5/df4/group__sudoku_gadfe0ed5085b4775d8fa00b434cc0fdfc_cgraph.svg" width = "354" height = "135" > < p > < b > This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.< / b > < / p > < / iframe >
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< / div >
< / div >
< / div >
< / div >
< / div > <!-- contents -->
< / div > <!-- doc - content -->
<!-- start footer part -->
< div id = "nav-path" class = "navpath" > <!-- id is needed for treeview function! -->
< ul >
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< li class = "footer" > Generated by < a href = "https://www.doxygen.org/index.html" > < img class = "footer" src = "../../doxygen.svg" width = "104" height = "31" alt = "doxygen" / > < / a > 1.9.5 < / li >
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< / ul >
< / div >
< / body >
< / html >
