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Co-authored-by: Utsav Khemka <utsav9125368000@gmail.com>
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LeetCode
========
# LeetCode
### LeetCode Algorithm
| # | Title | Solution | Difficulty |
|---| ----- | -------- | ---------- |
|1|[Two Sum](https://leetcode.com/problems/two-sum/) | [C](./src/1.c)|Easy|
|2|[Add Two Numbers](https://leetcode.com/problems/add-two-numbers/) | [C](./src/2.c)|Medium|
|3|[Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/) | [C](./src/3.c)|Medium|
|4|[Median of Two Sorted Arrays](https://leetcode.com/problems/median-of-two-sorted-arrays/) | [C](./src/4.c)|Hard|
|6|[ZigZag conversion](https://leetcode.com/problems/zigzag-conversion/) | [C](./src/4.c)|Medium|
|7|[Reverse Integer](https://leetcode.com/problems/reverse-integer/) | [C](./src/7.c)|Easy|
|8|[String to Integer (atoi)](https://leetcode.com/problems/string-to-integer-atoi) | [C](./src/8.c)|Medium|
|9|[Palindrome Number](https://leetcode.com/problems/palindrome-number/) | [C](./src/9.c)|Easy|
|11| [Container With Most Water](https://leetcode.com/problems/container-with-most-water/) | [C](./src/11.c)|Medium|
|12|[Integer to Roman](https://leetcode.com/problems/integer-to-roman) | [C](./src/12.c)|Medium|
|13|[Roman to Integer](https://leetcode.com/problems/roman-to-integer/) | [C](./src/13.c)|Easy|
|20|[Valid Parentheses](https://leetcode.com/problems/valid-parentheses/) | [C](./src/20.c)|Easy|
|21|[Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/) | [C](./src/21.c)|Easy|
|24|[Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs/) | [C](./src/24.c)|Medium|
|26|[Remove Duplicates from Sorted Array](https://leetcode.com/problems/remove-duplicates-from-sorted-array/) | [C](./src/26.c)|Easy|
|27|[Remove Element](https://leetcode.com/problems/remove-element/) | [C](./src/27.c)|Easy|
|28|[Implement strStr()](https://leetcode.com/problems/implement-strstr/) | [C](./src/28.c)|Easy|
|29|[Divide Two Integers](https://leetcode.com/problems/divide-two-integers/) | [C](./src/29.c)|Medium|
|35|[Search Insert Position](https://leetcode.com/problems/search-insert-position/) | [C](./src/35.c)|Easy|
|38|[Count and Say](https://leetcode.com/problems/count-and-say/) | [C](./src/38.c)|Easy|
|53|[Maximum Subarray](https://leetcode.com/problems/maximum-subarray/) | [C](./src/53.c)|Easy|
|66|[Plus One](https://leetcode.com/problems/plus-one/) | [C](./src/66.c)|Easy|
|82|[Remove Duplicates from Sorted List II](https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/) | [C](./src/82.c)|Medium|
|83|[Remove Duplicates from Sorted List](https://leetcode.com/problems/remove-duplicates-from-sorted-list/) | [C](./src/83.c)|Easy|
|94|[Binary Tree Inorder Traversal](https://leetcode.com/problems/binary-tree-inorder-traversal/) | [C](./src/94.c)|Medium|
|101|[Symmetric Tree](https://leetcode.com/problems/symmetric-tree/) | [C](./src/101.c)|Easy|
|104|[Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree/) | [C](./src/104.c)|Easy|
|108|[Convert Sorted Array to Binary Search Tree](https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/) | [C](./src/108.c)|Easy|
|109|[Convert Sorted List to Binary Search Tree](https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/) | [C](./src/109.c)|Medium|
|110|[Balanced Binary Tree](https://leetcode.com/problems/balanced-binary-tree/) | [C](./src/110.c)|Easy|
|112|[Path Sum](https://leetcode.com/problems/path-sum/) | [C](./src/112.c)|Easy|
|118|[Pascal's Triangle](https://leetcode.com/problems/pascals-triangle/) | [C](./src/118.c)|Easy|
|121|[Best Time to Buy and Sell Stock](https://leetcode.com/problems/best-time-to-buy-and-sell-stock/) | [C](./src/121.c)|Easy|
|125|[Valid Palindrome](https://leetcode.com/problems/valid-palindrome/) | [C](./src/125.c)|Easy|
|136|[Single Number](https://leetcode.com/problems/single-number/) | [C](./src/136.c)|Easy|
|141|[Linked List Cycle](https://leetcode.com/problems/linked-list-cycle/) | [C](./src/141.c)|Easy|
|142|[Linked List Cycle II](https://leetcode.com/problems/linked-list-cycle-ii/) | [C](./src/142.c)|Medium|
|153|[Find Minimum in Rotated Sorted Array](https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/) | [C](./src/153.c)|Medium|
|160|[Intersection of Two Linked Lists](https://leetcode.com/problems/intersection-of-two-linked-lists/) | [C](./src/160.c)|Easy|
|169|[Majority Element](https://leetcode.com/problems/majority-element/) | [C](./src/169.c)|Easy|
|173|[Binary Search Tree Iterator](https://leetcode.com/problems/binary-search-tree-iterator/) | [C](./src/173.c)|Medium|
|189|[Rotate Array](https://leetcode.com/problems/rotate-array) | [C](./src/189.c)|Easy|
|190|[Reverse Bits](https://leetcode.com/problems/reverse-bits/) | [C](./src/190.c)|Easy|
|191|[Number of 1 Bits](https://leetcode.com/problems/number-of-1-bits/) | [C](./src/191.c)|Easy|
|201|[Bitwise AND of Numbers Range](https://leetcode.com/problems/bitwise-and-of-numbers-range/) | [C](./src/201.c)|Medium|
|203|[Remove Linked List Elements](https://leetcode.com/problems/remove-linked-list-elements/) | [C](./src/203.c)|Easy|
|206|[Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/) | [C](./src/206.c)|Easy|
|215|[Kth Largest Element in an Array](https://leetcode.com/problems/kth-largest-element-in-an-array/) | [C](./src/215.c)|Medium|
|217|[Contains Duplicate](https://leetcode.com/problems/contains-duplicate/) | [C](./src/217.c)|Easy|
|226|[Invert Binary Tree](https://leetcode.com/problems/invert-binary-tree/) | [C](./src/226.c)|Easy|
|231|[Power of Two](https://leetcode.com/problems/power-of-two/) | [C](./src/231.c)|Easy|
|234|[Palindrome Linked List](https://leetcode.com/problems/palindrome-linked-list/) | [C](./src/234.c)|Easy|
|242|[Valid Anagram](https://leetcode.com/problems/valid-anagram/) | [C](./src/242.c)|Easy|
|268|[Missing Number](https://leetcode.com/problems/missing-number/) | [C](./src/268.c)|Easy|
|278|[First Bad Version](https://leetcode.com/problems/first-bad-version/) | [C](./src/278.c)|Easy|
|283|[Move Zeroes](https://leetcode.com/problems/move-zeroes/) | [C](./src/283.c)|Easy|
|287|[Find the Duplicate Number](https://leetcode.com/problems/find-the-duplicate-number/) | [C](./src/287.c)|Medium|
|344|[Reverse String](https://leetcode.com/problems/reverse-string/) | [C](./src/344.c)|Easy|
|367|[Valid Perfect Square](https://leetcode.com/problems/valid-perfect-square/) | [C](./src/367.c)|Easy|
|387|[First Unique Character in a String](https://leetcode.com/problems/first-unique-character-in-a-string/) | [C](./src/387.c)|Easy|
|389|[Find the Difference](https://leetcode.com/problems/find-the-difference/) | [C](./src/389.c)|Easy|
|404|[Sum of Left Leaves](https://leetcode.com/problems/sum-of-left-leaves/) | [C](./src/404.c)|Easy|
|442|[Find All Duplicates in an Array](https://leetcode.com/problems/find-all-duplicates-in-an-array/) | [C](./src/442.c)|Medium|
|461|[Hamming Distance](https://leetcode.com/problems/hamming-distance/) | [C](./src/461.c) |Easy|
|476|[Number Complement](https://leetcode.com/problems/number-complement/) | [C](./src/476.c)|Easy|
|509|[Fibonacci Number](https://leetcode.com/problems/fibonacci-number/) | [C](./src/509.c)|Easy|
|520|[Detect Capital](https://leetcode.com/problems/detect-capital/) | [C](./src/520.c)|Easy|
|561|[Array Partition I](https://leetcode.com/problems/array-partition-i/) | [C](./src/561.c)|Easy|
|617|[Merge Two Binary Trees](https://leetcode.com/problems/merge-two-binary-trees/) | [C](./src/617.c)|Easy|
|647|[Palindromic Substring](https://leetcode.com/problems/palindromic-substrings/) | [C](./src/647.c)|Medium|
|674|[Longest Continuous Increasing Subsequence](https://leetcode.com/problems/longest-continuous-increasing-subsequence/) | [C](./src/674.c)|Easy|
|700|[Search in a Binary Search Tree](https://leetcode.com/problems/search-in-a-binary-search-tree/) | [C](./src/700.c)|Easy|
|701|[Insert into a Binary Search Tree](https://leetcode.com/problems/insert-into-a-binary-search-tree/) | [C](./src/701.c)|Medium|
|704|[Binary Search](https://leetcode.com/problems/binary-search/) | [C](./src/704.c)|Easy|
|709|[To Lower Case](https://leetcode.com/problems/to-lower-case/) | [C](./src/709.c)|Easy|
|771|[Jewels and Stones](https://leetcode.com/problems/jewels-and-stones/) | [C](./src/771.c)|Easy|
|852|[Peak Index in a Mountain Array](https://leetcode.com/problems/peak-index-in-a-mountain-array/) | [C](./src/852.c)|Easy|
|876|[Middle of the Linked List](https://leetcode.com/problems/middle-of-the-linked-list/) | [C](./src/876.c)|Easy|
|905|[Sort Array By Parity](https://leetcode.com/problems/sort-array-by-parity/) | [C](./src/905.c)|Easy|
|917|[Reverse Only Letters](https://leetcode.com/problems/reverse-only-letters/) | [C](./src/917.c)|Easy|
|938|[Range Sum of BST](https://leetcode.com/problems/range-sum-of-bst/) | [C](./src/938.c)|Easy|
|965|[Univalued Binary Tree](https://leetcode.com/problems/univalued-binary-tree/) | [C](./src/965.c)|Easy|
|977|[Squares of a Sorted Array](https://leetcode.com/problems/squares-of-a-sorted-array/) | [C](./src/977.c)|Easy|
|1089|[Duplicate Zeros](https://leetcode.com/problems/duplicate-zeros/) | [C](./src/1089.c)|Easy|
|1184|[Distance Between Bus Stops](https://leetcode.com/problems/distance-between-bus-stops/) | [C](./src/1184.c)|Easy|
|1189|[Maximum Number of Balloons](https://leetcode.com/problems/maximum-number-of-balloons/) | [C](./src/1189.c)|Easy|
|1207|[Unique Number of Occurrences](https://leetcode.com/problems/unique-number-of-occurrences/) | [C](./src/1207.c)|Easy|
|2130|[Maximum Twin Sum of a Linked List](https://leetcode.com/problems/maximum-twin-sum-of-a-linked-list/) | [C](./src/2130.c)|Medium|
| # | Title | Solution | Difficulty |
| ---- | ------------------------------------------------------------------------------------------------------------------------------- | ----------------- | ---------- |
| 1 | [Two Sum](https://leetcode.com/problems/two-sum/) | [C](./src/1.c) | Easy |
| 2 | [Add Two Numbers](https://leetcode.com/problems/add-two-numbers/) | [C](./src/2.c) | Medium |
| 3 | [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/) | [C](./src/3.c) | Medium |
| 4 | [Median of Two Sorted Arrays](https://leetcode.com/problems/median-of-two-sorted-arrays/) | [C](./src/4.c) | Hard |
| 6 | [ZigZag conversion](https://leetcode.com/problems/zigzag-conversion/) | [C](./src/4.c) | Medium |
| 7 | [Reverse Integer](https://leetcode.com/problems/reverse-integer/) | [C](./src/7.c) | Easy |
| 8 | [String to Integer (atoi)](https://leetcode.com/problems/string-to-integer-atoi) | [C](./src/8.c) | Medium |
| 9 | [Palindrome Number](https://leetcode.com/problems/palindrome-number/) | [C](./src/9.c) | Easy |
| 11 | [Container With Most Water](https://leetcode.com/problems/container-with-most-water/) | [C](./src/11.c) | Medium |
| 12 | [Integer to Roman](https://leetcode.com/problems/integer-to-roman) | [C](./src/12.c) | Medium |
| 13 | [Roman to Integer](https://leetcode.com/problems/roman-to-integer/) | [C](./src/13.c) | Easy |
| 20 | [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/) | [C](./src/20.c) | Easy |
| 21 | [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/) | [C](./src/21.c) | Easy |
| 24 | [Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs/) | [C](./src/24.c) | Medium |
| 26 | [Remove Duplicates from Sorted Array](https://leetcode.com/problems/remove-duplicates-from-sorted-array/) | [C](./src/26.c) | Easy |
| 27 | [Remove Element](https://leetcode.com/problems/remove-element/) | [C](./src/27.c) | Easy |
| 28 | [Implement strStr()](https://leetcode.com/problems/implement-strstr/) | [C](./src/28.c) | Easy |
| 29 | [Divide Two Integers](https://leetcode.com/problems/divide-two-integers/) | [C](./src/29.c) | Medium |
| 35 | [Search Insert Position](https://leetcode.com/problems/search-insert-position/) | [C](./src/35.c) | Easy |
| 38 | [Count and Say](https://leetcode.com/problems/count-and-say/) | [C](./src/38.c) | Easy |
| 53 | [Maximum Subarray](https://leetcode.com/problems/maximum-subarray/) | [C](./src/53.c) | Easy |
| 62 | [Unique Paths](https://leetcode.com/problems/unique-paths/description/) | Medium |
| 66 | [Plus One](https://leetcode.com/problems/plus-one/) | [C](./src/66.c) | Easy |
| 82 | [Remove Duplicates from Sorted List II](https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/) | [C](./src/82.c) | Medium |
| 83 | [Remove Duplicates from Sorted List](https://leetcode.com/problems/remove-duplicates-from-sorted-list/) | [C](./src/83.c) | Easy |
| 94 | [Binary Tree Inorder Traversal](https://leetcode.com/problems/binary-tree-inorder-traversal/) | [C](./src/94.c) | Medium |
| 101 | [Symmetric Tree](https://leetcode.com/problems/symmetric-tree/) | [C](./src/101.c) | Easy |
| 104 | [Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree/) | [C](./src/104.c) | Easy |
| 108 | [Convert Sorted Array to Binary Search Tree](https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/) | [C](./src/108.c) | Easy |
| 109 | [Convert Sorted List to Binary Search Tree](https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/) | [C](./src/109.c) | Medium |
| 110 | [Balanced Binary Tree](https://leetcode.com/problems/balanced-binary-tree/) | [C](./src/110.c) | Easy |
| 112 | [Path Sum](https://leetcode.com/problems/path-sum/) | [C](./src/112.c) | Easy |
| 118 | [Pascal's Triangle](https://leetcode.com/problems/pascals-triangle/) | [C](./src/118.c) | Easy |
| 121 | [Best Time to Buy and Sell Stock](https://leetcode.com/problems/best-time-to-buy-and-sell-stock/) | [C](./src/121.c) | Easy |
| 125 | [Valid Palindrome](https://leetcode.com/problems/valid-palindrome/) | [C](./src/125.c) | Easy |
| 136 | [Single Number](https://leetcode.com/problems/single-number/) | [C](./src/136.c) | Easy |
| 141 | [Linked List Cycle](https://leetcode.com/problems/linked-list-cycle/) | [C](./src/141.c) | Easy |
| 142 | [Linked List Cycle II](https://leetcode.com/problems/linked-list-cycle-ii/) | [C](./src/142.c) | Medium |
| 153 | [Find Minimum in Rotated Sorted Array](https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/) | [C](./src/153.c) | Medium |
| 160 | [Intersection of Two Linked Lists](https://leetcode.com/problems/intersection-of-two-linked-lists/) | [C](./src/160.c) | Easy |
| 169 | [Majority Element](https://leetcode.com/problems/majority-element/) | [C](./src/169.c) | Easy |
| 173 | [Binary Search Tree Iterator](https://leetcode.com/problems/binary-search-tree-iterator/) | [C](./src/173.c) | Medium |
| 189 | [Rotate Array](https://leetcode.com/problems/rotate-array) | [C](./src/189.c) | Easy |
| 190 | [Reverse Bits](https://leetcode.com/problems/reverse-bits/) | [C](./src/190.c) | Easy |
| 191 | [Number of 1 Bits](https://leetcode.com/problems/number-of-1-bits/) | [C](./src/191.c) | Easy |
| 201 | [Bitwise AND of Numbers Range](https://leetcode.com/problems/bitwise-and-of-numbers-range/) | [C](./src/201.c) | Medium |
| 203 | [Remove Linked List Elements](https://leetcode.com/problems/remove-linked-list-elements/) | [C](./src/203.c) | Easy |
| 206 | [Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/) | [C](./src/206.c) | Easy |
| 215 | [Kth Largest Element in an Array](https://leetcode.com/problems/kth-largest-element-in-an-array/) | [C](./src/215.c) | Medium |
| 217 | [Contains Duplicate](https://leetcode.com/problems/contains-duplicate/) | [C](./src/217.c) | Easy |
| 226 | [Invert Binary Tree](https://leetcode.com/problems/invert-binary-tree/) | [C](./src/226.c) | Easy |
| 231 | [Power of Two](https://leetcode.com/problems/power-of-two/) | [C](./src/231.c) | Easy |
| 234 | [Palindrome Linked List](https://leetcode.com/problems/palindrome-linked-list/) | [C](./src/234.c) | Easy |
| 242 | [Valid Anagram](https://leetcode.com/problems/valid-anagram/) | [C](./src/242.c) | Easy |
| 268 | [Missing Number](https://leetcode.com/problems/missing-number/) | [C](./src/268.c) | Easy |
| 278 | [First Bad Version](https://leetcode.com/problems/first-bad-version/) | [C](./src/278.c) | Easy |
| 283 | [Move Zeroes](https://leetcode.com/problems/move-zeroes/) | [C](./src/283.c) | Easy |
| 287 | [Find the Duplicate Number](https://leetcode.com/problems/find-the-duplicate-number/) | [C](./src/287.c) | Medium |
| 344 | [Reverse String](https://leetcode.com/problems/reverse-string/) | [C](./src/344.c) | Easy |
| 367 | [Valid Perfect Square](https://leetcode.com/problems/valid-perfect-square/) | [C](./src/367.c) | Easy |
| 387 | [First Unique Character in a String](https://leetcode.com/problems/first-unique-character-in-a-string/) | [C](./src/387.c) | Easy |
| 389 | [Find the Difference](https://leetcode.com/problems/find-the-difference/) | [C](./src/389.c) | Easy |
| 404 | [Sum of Left Leaves](https://leetcode.com/problems/sum-of-left-leaves/) | [C](./src/404.c) | Easy |
| 442 | [Find All Duplicates in an Array](https://leetcode.com/problems/find-all-duplicates-in-an-array/) | [C](./src/442.c) | Medium |
| 461 | [Hamming Distance](https://leetcode.com/problems/hamming-distance/) | [C](./src/461.c) | Easy |
| 476 | [Number Complement](https://leetcode.com/problems/number-complement/) | [C](./src/476.c) | Easy |
| 509 | [Fibonacci Number](https://leetcode.com/problems/fibonacci-number/) | [C](./src/509.c) | Easy |
| 520 | [Detect Capital](https://leetcode.com/problems/detect-capital/) | [C](./src/520.c) | Easy |
| 561 | [Array Partition I](https://leetcode.com/problems/array-partition-i/) | [C](./src/561.c) | Easy |
| 617 | [Merge Two Binary Trees](https://leetcode.com/problems/merge-two-binary-trees/) | [C](./src/617.c) | Easy |
| 647 | [Palindromic Substring](https://leetcode.com/problems/palindromic-substrings/) | [C](./src/647.c) | Medium |
| 674 | [Longest Continuous Increasing Subsequence](https://leetcode.com/problems/longest-continuous-increasing-subsequence/) | [C](./src/674.c) | Easy |
| 700 | [Search in a Binary Search Tree](https://leetcode.com/problems/search-in-a-binary-search-tree/) | [C](./src/700.c) | Easy |
| 701 | [Insert into a Binary Search Tree](https://leetcode.com/problems/insert-into-a-binary-search-tree/) | [C](./src/701.c) | Medium |
| 704 | [Binary Search](https://leetcode.com/problems/binary-search/) | [C](./src/704.c) | Easy |
| 709 | [To Lower Case](https://leetcode.com/problems/to-lower-case/) | [C](./src/709.c) | Easy |
| 771 | [Jewels and Stones](https://leetcode.com/problems/jewels-and-stones/) | [C](./src/771.c) | Easy |
| 852 | [Peak Index in a Mountain Array](https://leetcode.com/problems/peak-index-in-a-mountain-array/) | [C](./src/852.c) | Easy |
| 876 | [Middle of the Linked List](https://leetcode.com/problems/middle-of-the-linked-list/) | [C](./src/876.c) | Easy |
| 905 | [Sort Array By Parity](https://leetcode.com/problems/sort-array-by-parity/) | [C](./src/905.c) | Easy |
| 917 | [Reverse Only Letters](https://leetcode.com/problems/reverse-only-letters/) | [C](./src/917.c) | Easy |
| 938 | [Range Sum of BST](https://leetcode.com/problems/range-sum-of-bst/) | [C](./src/938.c) | Easy |
| 965 | [Univalued Binary Tree](https://leetcode.com/problems/univalued-binary-tree/) | [C](./src/965.c) | Easy |
| 977 | [Squares of a Sorted Array](https://leetcode.com/problems/squares-of-a-sorted-array/) | [C](./src/977.c) | Easy |
| 1089 | [Duplicate Zeros](https://leetcode.com/problems/duplicate-zeros/) | [C](./src/1089.c) | Easy |
| 1184 | [Distance Between Bus Stops](https://leetcode.com/problems/distance-between-bus-stops/) | [C](./src/1184.c) | Easy |
| 1189 | [Maximum Number of Balloons](https://leetcode.com/problems/maximum-number-of-balloons/) | [C](./src/1189.c) | Easy |
| 1207 | [Unique Number of Occurrences](https://leetcode.com/problems/unique-number-of-occurrences/) | [C](./src/1207.c) | Easy |
| 2130 | [Maximum Twin Sum of a Linked List](https://leetcode.com/problems/maximum-twin-sum-of-a-linked-list/) | [C](./src/2130.c) | Medium |

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leetcode/src/62.c Normal file
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// Dynamic programming can be applied here, because every solved sub-problem has
// an optimal sub-solution
// Searching backwards from end to start, we can incrementally calculate number
// of paths to destination. i.e. start from bottom-right, and calculate
// leftwards (lowest row should all be 1). then go to second-last-row, rightmost
// column, and calculate leftwards the last cell to be calculated is the start
// location (0, 0). The iteration ordering is intentional: the inner loop
// iterates the contents of each vector, the outer loop iterates each vector.
// This is more cache-friendly.
// Example below, calculated from right-to-left, bottom-to-top.
// 7 by 3 grid
// 28 21 15 10 6 3 1
// 7 6 5 4 3 2 1
// 1 1 1 1 1 1 1
int uniquePaths(int m, int n)
{
int dp[m][n];
for (int column = 0; column < n; column++)
{
dp[0][column] = 1;
}
for (int row = 1; row < m; row++)
{
dp[row][0] = 1;
}
for (int row = 1; row < m; row++)
{
for (int column = 1; column < n; column++)
{
dp[row][column] = dp[row - 1][column] + dp[row][column - 1];
}
}
return dp[m - 1][n - 1];
}