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feat: leetcode zigzag solution (#897)
* perf: faster implementation of the TwoSum problem
* doc: fixed typos on comments
* updating DIRECTORY.md
* feat: leetcode ZigZag conversion solution
* doc: leetcode README added ZigZag conversion solution
* fix: clang-tidy linter corrections
* doc: fixed typo on leetcode README
* Update leetcode/src/6.c
@file does not want parameters
Co-authored-by: David Leal <halfpacho@gmail.com>
* Update leetcode/src/6.c
Co-authored-by: David Leal <halfpacho@gmail.com>
* fix: unsigned int and include comments
* fix: comments on includes. Doxygen file. static test function
* fix: add missing headers
* Delete 1.c
* Revert "Merge branch 'master' into leetcode/zigzag"
This reverts commit b46a6afd52
.
* fix: revert 1.c
* updating DIRECTORY.md
* Empty commit to test the CI
* Update leetcode/src/6.c
Co-authored-by: David Leal <halfpacho@gmail.com>
* Update leetcode/src/6.c
Co-authored-by: David Leal <halfpacho@gmail.com>
* fix: missing main
* updating DIRECTORY.md
* doc: added missing comment
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: David Leal <halfpacho@gmail.com>
This commit is contained in:
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@ -222,6 +222,7 @@
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* [520](https://github.com/TheAlgorithms/C/blob/master/leetcode/src/520.c)
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* [53](https://github.com/TheAlgorithms/C/blob/master/leetcode/src/53.c)
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* [561](https://github.com/TheAlgorithms/C/blob/master/leetcode/src/561.c)
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* [6](https://github.com/TheAlgorithms/C/blob/master/leetcode/src/6.c)
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* [617](https://github.com/TheAlgorithms/C/blob/master/leetcode/src/617.c)
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* [647](https://github.com/TheAlgorithms/C/blob/master/leetcode/src/647.c)
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* [66](https://github.com/TheAlgorithms/C/blob/master/leetcode/src/66.c)
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@ -10,6 +10,7 @@ LeetCode
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|2|[Add Two Numbers](https://leetcode.com/problems/add-two-numbers/) | [C](./src/2.c)|Medium|
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|3|[Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/) | [C](./src/3.c)|Medium|
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|4|[Median of Two Sorted Arrays](https://leetcode.com/problems/median-of-two-sorted-arrays/) | [C](./src/4.c)|Hard|
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|6|[ZigZag conversion](https://leetcode.com/problems/zigzag-conversion/) | [C](./src/4.c)|Medium|
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|7|[Reverse Integer](https://leetcode.com/problems/reverse-integer/) | [C](./src/7.c)|Easy|
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|8|[String to Integer (atoi)](https://leetcode.com/problems/string-to-integer-atoi) | [C](./src/8.c)|Medium|
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|9|[Palindrome Number](https://leetcode.com/problems/palindrome-number/) | [C](./src/9.c)|Easy|
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151
leetcode/src/6.c
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151
leetcode/src/6.c
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@ -0,0 +1,151 @@
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/**
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* @file
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* @brief Implementation of the [ZigZag
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* Conversion](https://leetcode.com/problems/zigzag-conversion/) Leetcode
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* problem
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* @details
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* A decent solution to the ZigZag conversion problem.
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* Take advantage of the fact that the maximum gap between the chars is 2 times
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* the depth(the number of rows).
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* The actual gap between the two first chars of a rows depends on the depth of
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* the row. The gaps between successives chars on the same row is the complement
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* of the first gap to the maximum gap.
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* @author [straight_into_the_wall](https://github.com/straight-into-the-wall)
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*/
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#include <assert.h> /// for assert
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#include <stdint.h> /// for unsigned int with fixed size
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#include <stdio.h> /// for IO operations
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#include <stdlib.h> /// for malloc
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#include <string.h> /// for string tools
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/**
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* @brief Convert a string to the it's zigzag equivalent on a given number of
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* rows.
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* @param in the string in input.
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* @param numRows the desired number of rows.
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* @returns the converted new (malloced) string.
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*/
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char* convert(char* in, uint16_t numRows)
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{
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uint16_t len = strlen(in);
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if (len < numRows)
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{
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numRows = len;
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}
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char* out = calloc(len + 1, sizeof(char));
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if (numRows < 2)
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{
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memcpy(out, in, len + 1);
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return out;
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}
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uint16_t max = numRows - 1;
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uint16_t rr = 2 * max;
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uint16_t i = 0;
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uint16_t o = 0;
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uint16_t delta = 0;
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// first row
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while (i < len)
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{
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out[o++] = in[i];
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i += rr;
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}
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// middle rows
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for (uint16_t l = 1; l < max; l++)
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{
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i = l;
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delta = 2 * l;
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while (i < len)
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{
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out[o++] = in[i];
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delta = rr - delta;
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i += delta;
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}
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}
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// last row
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i = max;
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while (i < len)
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{
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out[o++] = in[i];
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i += rr;
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}
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return out;
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}
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/**
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* @brief Self-test implementations
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* @returns void
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*/
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static void testZigZag(char* s, int numRows, char* expected)
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{
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char* ret = convert(s, numRows);
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int len = strlen(s);
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int cmp = strncmp(ret, expected, len);
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assert(!cmp);
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free(ret);
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}
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/**
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* @brief Self-test implementations
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* @returns void
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*/
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static void test()
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{
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char* s01 = "PAYPALISHIRING";
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char* r01 = "PINALSIGYAHRPI";
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testZigZag(s01, 4, r01);
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char* r02 = "PAHNAPLSIIGYIR";
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testZigZag(s01, 3, r02);
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char* s03 = "A";
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testZigZag(s03, 1, s03);
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testZigZag(s03, 3, s03);
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char* s04 =
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"cbxdwjccgtdoqiscyspqzvuqivzptlpvooynyapgvswoaosaghrffnxnjyeeltzaiznicc"
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"ozwknwyhzgpqlwfkjqipuu"
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"jvwtxlbznryjdohbvghmyuiggtyqjtmuqinntqmihntkddnalwnmsxsatqqeldacnnpjfe"
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"rmrnyuqnwbjjpdjhdeavkn"
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"ykpoxhxclqqedqavdwzoiorrwwxyrhlsrdgqkduvtmzzczufvtvfioygkvedervvudnegh"
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"bctcbxdxezrzgbpfhzanff"
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"eccbgqfmzjqtlrsppxqiywjobspefujlxnmddurddiyobqfspvcoulcvdrzkmkwlyiqdch"
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"ghrgytzdnobqcvdeqjystm"
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"epxcaniewqmoxkjwpymqorluxedvywhcoghotpusfgiestckrpaigocfufbubiyrrffmwa"
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"eeimidfnnzcphkflpbqsvt"
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"dwludsgaungfzoihbxifoprwcjzsdxngtacw";
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char* r04 =
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"cbxdwjccgtdoqiscyspqzvuqivzptlpvooynyapgvswoaosaghrffnxnjyeeltzaiznicc"
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"ozwknwyhzgpqlwfkjqipuu"
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"jvwtxlbznryjdohbvghmyuiggtyqjtmuqinntqmihntkddnalwnmsxsatqqeldacnnpjfe"
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"rmrnyuqnwbjjpdjhdeavkn"
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"ykpoxhxclqqedqavdwzoiorrwwxyrhlsrdgqkduvtmzzczufvtvfioygkvedervvudnegh"
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"bctcbxdxezrzgbpfhzanff"
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"eccbgqfmzjqtlrsppxqiywjobspefujlxnmddurddiyobqfspvcoulcvdrzkmkwlyiqdch"
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"ghrgytzdnobqcvdeqjystm"
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"epxcaniewqmoxkjwpymqorluxedvywhcoghotpusfgiestckrpaigocfufbubiyrrffmwa"
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"eeimidfnnzwccpahtkgfnl"
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"xpdbsqzsjvctwdrwploufdisxgbahuinogzf";
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testZigZag(s04, 472, r04);
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}
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/**
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* @brief Main function
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* @returns 0 on exit
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*/
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int main(void)
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{
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test(); // run self-test implementations
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return 0;
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}
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