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package ch07;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

import java.util.List;

public class P10_1 {

public int arrayPairSum(int[] nums) {

int sum = 0;

List<Integer> pair = new ArrayList<>();

Arrays.sort(nums);

// 앞에서부터 오름차순으로 반복

for (int n : nums) {

pair.add(n);

// 페어 변수에 값이 2개 채워지면 min()을 합산하고 변수 초기화

if (pair.size() == 2) {

sum += Collections.min(pair);

pair.clear();

}

}

return sum;

}

}