// 3355. Zero Array Transformation I #include "leetcode.h" /* * you are given an integer array 'nums' of length 'n' and a 2d array 'queries' * where 'queries[i] = [li, ri]'. for each 'queries[i]' select a subset of * indices within the range '[li, ri]' in 'nums' and decrement the values at the * selected indices by 1. a zero array is an array where all elements are equal * to 0. return true if it is possible to transform 'nums' into a zero array * after processing all the queries sequentially, otherwise return false. */ bool isZeroArray(int *nums, int numsSize, int **queries, int queriesSize, int *queriesColSize) { int *freq = (int *)calloc(numsSize + 1, sizeof(int)); for (int i = 0; i < queriesSize; i++) { int l = queries[i][0], r = queries[i][1]; freq[l]++; freq[r + 1]--; } int cnt = 0; for (int i = 0; i < numsSize; i++) { cnt += freq[i]; if (nums[i] > cnt) { free(freq); return false; } } free(freq); return true; } int main() { int n1[] = {1, 0, 1}, q1i[1][2] = {{0, 2}}; int n2[] = {4, 3, 2, 1}, q2i[2][2] = {{1, 3}, {0, 2}}; struct two_d_arr q1, q2; two_d_arr_init(&q1, ARRAY_SIZE(q1i), ARRAY_SIZE(q1i[0]), q1i); two_d_arr_init(&q2, ARRAY_SIZE(q2i), ARRAY_SIZE(q2i[0]), q2i); printf("%d\n", isZeroArray(n1, ARRAY_SIZE(n1), q1.arr, q1.row_size, q1.col_size)); // expect: 1 printf("%d\n", isZeroArray(n2, ARRAY_SIZE(n2), q2.arr, q2.row_size, q2.col_size)); // expect: 0 two_d_arr_free(&q1); two_d_arr_free(&q2); }