aboutsummaryrefslogtreecommitdiff
path: root/set_matrix_zeroes.c
diff options
context:
space:
mode:
Diffstat (limited to 'set_matrix_zeroes.c')
-rw-r--r--set_matrix_zeroes.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/set_matrix_zeroes.c b/set_matrix_zeroes.c
new file mode 100644
index 0000000..be0e332
--- /dev/null
+++ b/set_matrix_zeroes.c
@@ -0,0 +1,44 @@
+// 73. Set Matrix Zeroes
+#include "leetcode.h"
+
+/*
+ * given an 'm x n' integer 'matrix', if an element is '0', set its entire row
+ * and columns to '0's. you must do it in place
+ */
+
+void setZeroes(int **matrix, int matrixSize, int *matrixColSize) {
+ bool *r = (bool *)calloc(matrixSize, sizeof(bool));
+ bool *c = (bool *)calloc(*matrixColSize, sizeof(bool));
+ for (int i = 0; i < matrixSize; ++i)
+ for (int j = 0; j < *matrixColSize; ++j)
+ if (!matrix[i][j]) {
+ r[i] = true;
+ r[j] = true;
+ }
+ for (int i = 0; i < matrixSize; ++i)
+ for (int j = 0; j < *matrixColSize; ++j)
+ if (r[i] || c[j])
+ matrix[i][j] = 0;
+}
+
+int main() {
+ int m1i[3][3] = {{1, 1, 1}, {1, 0, 1}, {1, 1, 1}},
+ m2i[3][4] = {{0, 1, 2, 0}, {3, 4, 5, 2}, {1, 3, 1, 5}};
+ struct two_d_arr m1, m2;
+ two_d_arr_init(&m1, ARRAY_SIZE(m1i), ARRAY_SIZE(m1i[0]), m1i);
+ two_d_arr_init(&m2, ARRAY_SIZE(m2i), ARRAY_SIZE(m2i[0]), m2i);
+ setZeroes(m1.arr, m1.row_size, m1.col_size);
+ setZeroes(m2.arr, m2.row_size, m2.col_size);
+ for (int i = 0; i < m1.row_size; i++) {
+ for (int j = 0; j < m1.col_size[i]; j++)
+ printf("%d ", m1i[i][j]); // expect: [[1,0,1],[0,0,0],[1,0,1]]
+ printf("\n");
+ }
+ for (int i = 0; i < m2.row_size; i++) {
+ for (int j = 0; j < m2.col_size[i]; j++)
+ printf("%d ", m2i[i][j]); // expect: [[0,0,0,0],[0,4,5,0],[0,3,1,0]]
+ printf("\n");
+ }
+ two_d_arr_free(&m1);
+ two_d_arr_free(&m2);
+}