diff options
Diffstat (limited to 'sort_matrix_by_diagonals.c')
-rw-r--r-- | sort_matrix_by_diagonals.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/sort_matrix_by_diagonals.c b/sort_matrix_by_diagonals.c new file mode 100644 index 0000000..2da8ad3 --- /dev/null +++ b/sort_matrix_by_diagonals.c @@ -0,0 +1,93 @@ +// 3446. Sort Matrix by Diagonals +#include "leetcode.h" + +/* + * you are given an 'n x n' square matrix of integers 'grid'. return the matrix + * such that the diagonals in the bottom left triangle including the middle are + * sorted in non-increasing order. the diagonals in the top-right triangle are + * sorted in non-decreasing order. + */ + +int cmp1(const void *a, const void *b) { return (*(int *)a - *(int *)b); } + +int cmp2(const void *a, const void *b) { return (*(int *)b - *(int *)a); } + +int **sortMatrix(int **grid, int gridSize, int *gridColSize, int *returnSize, + int **returnColumnSizes) { + *returnSize = gridSize; + *returnColumnSizes = gridColSize; + int n = gridSize, m = gridColSize[0]; + int diag_cnt = n + m - 1; + int *sizes = (int *)calloc(diag_cnt, sizeof(int)); + int **diags = (int **)malloc(diag_cnt * sizeof(int *)); + for (int i = 0; i < n; i++) + for (int j = 0; j < m; j++) + sizes[i - j + m - 1]++; + for (int k = 0; k < diag_cnt; k++) { + diags[k] = (int *)malloc(sizes[k] * sizeof(int)); + sizes[k] = 0; + } + for (int i = 0; i < n; i++) + for (int j = 0; j < m; j++) + diags[i - j + m - 1][sizes[i - j + m - 1]++] = grid[i][j]; + for (int k = 0; k < diag_cnt; k++) { + if (k < m - 1) + qsort(diags[k], sizes[k], sizeof(int), cmp1); + else + qsort(diags[k], sizes[k], sizeof(int), cmp2); + sizes[k] = 0; + } + for (int i = 0; i < n; i++) + for (int j = 0; j < m; j++) + grid[i][j] = diags[i - j + m - 1][sizes[i - j + m - 1]++]; + for (int i = 0; i < diag_cnt; i++) + free(diags[i]); + free(diags); + free(sizes); + return grid; +} + +int main() { + int g1i[3][3] = {{1, 7, 3}, {9, 8, 2}, {4, 5, 6}}, rs1, *rcs1; + int g2i[2][2] = {{0, 1}, {1, 2}}, rs2, *rcs2; + int g3i[1][1] = {{1}}, rs3, *rcs3; + struct two_d_arr *g1 = + two_d_arr_init(ARRAY_SIZE(g1i), ARRAY_SIZE(g1i[0]), g1i); + struct two_d_arr *g2 = + two_d_arr_init(ARRAY_SIZE(g2i), ARRAY_SIZE(g2i[0]), g2i); + struct two_d_arr *g3 = + two_d_arr_init(ARRAY_SIZE(g3i), ARRAY_SIZE(g3i[0]), g3i); + int **sm1 = sortMatrix(g1->arr, g1->row_size, g1->col_size, &rs1, &rcs1); + int **sm2 = sortMatrix(g2->arr, g2->row_size, g2->col_size, &rs2, &rcs2); + int **sm3 = sortMatrix(g3->arr, g3->row_size, g3->col_size, &rs3, &rcs3); + for (int i = 0; i < rs1; i++) { + for (int j = 0; j < rcs1[i]; j++) + printf("%d ", sm1[i][j]); // expect: [[8,2,3],[9,6,7],[4,5,1]] + printf("\n"); + } + for (int i = 0; i < rs2; i++) { + for (int j = 0; j < rcs2[i]; j++) + printf("%d ", sm2[i][j]); // expect: [[2,1],[1,0]] + printf("\n"); + } + for (int i = 0; i < rs3; i++) { + for (int j = 0; j < rcs3[i]; j++) + printf("%d ", sm3[i][j]); // expect: [[1]] + printf("\n"); + } + for (int i = 0; i < rs1; i++) + free(sm1[i]); + free(sm1); + for (int i = 0; i < rs2; i++) + free(sm2[i]); + free(sm2); + for (int i = 0; i < rs3; i++) + free(sm3[i]); + free(sm3); + free(rcs1); + free(rcs2); + free(rcs3); + two_d_arr_free(g1); + two_d_arr_free(g2); + two_d_arr_free(g3); +} |