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Ans
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
class Solution {
public:
int arrayPairSum(vector<int>& nums) {
sort(nums.begin(), nums.end());
int ans = 0;
for (int i = 0; i < nums.size(); i += 2) {
ans += nums[i];
}
return ans;
}
};