package learn;import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;public class RobRedPacket {// 发红包算法，金额参数以分为单位public static List<Integer> divideRedPacket(Integer totalAmount, Integer totalPeopleNum) {List<Integer> amountList = new ArrayList<>();// 剩余金额Integer restAmount = totalAmount;// 剩余没抢的人数Integer restPeopleNum = totalPeopleNum;Random random = new Random();for (int i = 0; i < totalPeopleNum - 1; i++) {// 随机范围：[1，剩余人均金额的两倍)，左闭右开int amount = random.nextInt(restAmount / restPeopleNum * 2 - 1) + 1;// 扣钱restAmount -= amount;// 修改人数restPeopleNum--;// 得到此次抢到的金额amountList.add(amount);}// 缺陷：最后一个人拿到的红包不是均分的amountList.add(restAmount);return amountList;}public static void main(String[] args) {List<Integer> amountList = divideRedPacket(5000, 30);for (Integer amount : amountList) {System.out.println("抢到金额：" +new BigDecimal(amount).divide(new BigDecimal(100)));}}
}