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feat: add Difference Between Ones and Zeros in Row and Column (#1183)
* add leetcode Difference Between Ones and Zeros in Row and Column * Update leetcode/DIRECTORY.md Co-authored-by: David Leal <halfpacho@gmail.com>
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| 2256 | [Minimum Average Difference](https://leetcode.com/problems/minimum-average-difference/) | [C](./src/2256.c) | Medium |
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| 2270 | [Number of Ways to Split Array](https://leetcode.com/problems/number-of-ways-to-split-array/) | [C](./src/2270.c) | Medium |
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| 2304 | [Minimum Path Cost in a Grid](https://leetcode.com/problems/minimum-path-cost-in-a-grid/) | [C](./src/2304.c) | Medium |
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| 2482 | [Difference Between Ones and Zeros in Row and Column](https://leetcode.com/problems/difference-between-ones-and-zeros-in-row-and-column/description/) | [C](./src/2482.c) | Medium |
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| 2501 | [Longest Square Streak in an Array](https://leetcode.com/problems/longest-square-streak-in-an-array/description/) | [C](./src/2501.c) | Medium |
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leetcode/src/2482.c
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leetcode/src/2482.c
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/**
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* Return an array of arrays of size *returnSize.
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* The sizes of the arrays are returned as *returnColumnSizes array.
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* Note: Both returned array and *columnSizes array must be malloced, assume caller calls free().
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*/
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// Calculating ones on each row and column.
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// Runtime: O(n * m)
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// Space: O(n + m)
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int** onesMinusZeros(int** grid, int gridSize, int* gridColSize, int* returnSize, int** returnColumnSizes){
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int n = gridSize;
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int m = gridColSize[0];
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int** result = malloc(gridSize * sizeof(int*));
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for (int i = 0; i < n; i++){
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result[i] = malloc(m * sizeof(int));
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}
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int* onesRows = calloc(n, sizeof(int));
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int* onesCols = calloc(m, sizeof(int));
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for (int i = 0; i < n; i++){
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for (int j = 0; j < m; j++){
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if (grid[i][j] == 1){
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onesRows[i] += 1;
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onesCols[j] += 1;
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}
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}
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}
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for (int i = 0; i < gridSize; i++){
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for (int j = 0; j < gridColSize[i]; j++){
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result[i][j] = onesRows[i] + onesCols[j] - (m - onesRows[i]) - (n - onesCols[j]);
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}
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}
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free(onesRows);
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free(onesCols);
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*returnSize = gridSize;
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*returnColumnSizes = gridColSize;
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return result;
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}
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