Leetcode 面试题 17.04 消失的数字

int missingNumber(int* nums, int numsSize)
{
    assert(nums);
    int ret = 0;
    for (int i = 0; i <= numsSize; i++)
    {
        ret ^= i;
    }
    for (int i = 0; i<numsSize; i++)
    {
        ret ^= nums[i];
    }
    return ret;
}