class Solution {
public:
int missingNumber(vector<int>& nums) {
int sum1 = 0;
for(int i = 0; i < nums.size() + 1; i++){
sum1 = sum1 + i;
}
int sum2 = 0;
for(int i = 0; i < nums.size(); i++){
sum2 = sum2 + nums[i];
}
return sum1 - sum2;
}
};
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