s4553711
8/24/2017 - 2:35 PM

561.cpp

class Solution {
public:
    int arrayPairSum(vector<int>& nums) {
        sort(nums.begin(), nums.end());
        int sum = 0;
        for(int i = 0; i < nums.size(); i+=2) {
            sum += nums[i];
        }
        return sum;
    }
};