题目：

题解：

int* findDisappearedNumbers(int* nums, int numsSize, int* returnSize) {for (int i = 0; i < numsSize; i++) {int x = (nums[i] - 1) % numsSize;nums[x] += numsSize;}int* ret = malloc(sizeof(int) * numsSize);*returnSize = 0;for (int i = 0; i < numsSize; i++) {if (nums[i] <= numsSize) {ret[(*returnSize)++] = i + 1;}}return ret;
}