题解 | #数组中重复的数字#

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param numbers int整型一维数组 
     * @return int整型
     */
    public int duplicate (int[] numbers) {
        // write code here
        int index_a = 0;
        int index_b = 0;
        int result = -1;
        for(int a = index_a;a<numbers.length;a++){
            boolean flag = false;
            while(index_b<numbers.length){
                if(numbers[a]==numbers[index_b] && a!=index_b){
                    flag = true;
                    result = numbers[a];
                    break;
                }
                index_b++;
            }
            if(flag){
                break;
            }
            index_b = 0;
        }
        return result;
    }
}