leetcode

0 class Solution {

1 public:

2 vector<int> findErrorNums(vector<int> &nums) const {

3 const int n = size(nums);

4 int dbl = 0, sum = 0;

5 for (int i = 0; i < n; i++) {

6 const int num = abs(nums[i]);

7 if (nums[num - 1] < 0) dbl = num;

8 nums[num - 1] = -nums[num - 1];

9 sum += num;

10 }

11 return {dbl, n * (n + 1) / 2 - (sum - dbl)};

12 }

13 };