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#include "leetcode.h"
class Solution {
public:
int missingNumber(vector<int> &nums) {
int sum = 0, n = nums.size();
int total = n * (n + 1) / 2;
for (auto number : nums)
sum += number;
return total - sum;
}
};
int main() {
Solution obj;
vector<int> nums = {9, 6, 4, 2, 3, 5, 7, 0, 1};
cout << obj.missingNumber(nums);
}
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