java相关的练手项目

package com.example.leetcode; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import com.alibaba.fastjson.JSON; /** * N2 * * @author ximu * @email chris.lyt@alibaba-inc.com * @date 2018/8/11 */ public class Question15 { public static void main(String[] args) { System.out.println(JSON.toJSONString(threeSum(new 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