Java实现 洛谷 P2141 珠心算测验

import java.util.LinkedList;
import java.util.Scanner;

public class Main {
    private static Scanner cin;

    public static void main(String args[]) throws Exception {
        cin = new Scanner(System.in);
        int n = cin.nextInt();
        int ret = 0;
        LinkedList<Integer> list = new LinkedList<Integer>();
        for (int i = 0; i < n; i++) {
            list.add(cin.nextInt());
        }
        Integer[] array = new Integer[list.size()];
        list.toArray(array);
        for (int i = 0; i < array.length; i++) {
            for (int j = 0; j < array.length; j++) {
                if (j != i) {
                    for (int k = j + 1; k < array.length; k++) {
                        if (k != i && array[j] + array[k] == array[i]) {
                            ret++;
                            k = array.length;
                            j = k;
                        }
                    }
                }
            }
        }
        System.out.println(ret);
    }
}