class Solution {
public:
int getMissingNumber(vector[HTML_REMOVED]& nums) {
unsigned int i;
set [HTML_REMOVED]hash;
int s[1001],index=0;
for (i = 0; i < nums.size(); i)
{
hash.insert(nums[i]);
}
for (i = 0; i <= nums.size(); i)
{
if (hash.find(i) == hash.end())s[index++] = i;
}
return *s;
}
};