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题目：

题解：

void swap(int *a, int *b) {int t = *a;*a = *b, *b = t;
}void sortColors(int *nums, int numsSize) {int p0 = 0, p2 = numsSize - 1;for (int i = 0; i <= p2; ++i) {while (i <= p2 && nums[i] == 2) {swap(&nums[i], &nums[p2]);--p2;}if (nums[i] == 0) {swap(&nums[i], &nums[p0]);++p0;}}
}