如果發總金額為 m mm 的 n nn 個紅包，先用一個長度為 n nn 的臨時數組 a aa 存放 n nn 個隨機雙精度小數 ，然后用 s u m sumsum 表示數組 a aa 的和，每個紅包的金額

import java.util.Arrays;import java.util.Random;import java.math.*;import java.util.Scanner;public class Main { public static long now_time; public static long seed; public static int[] get_red_packets(int money, int num) { Random random = new Random(seed); seed = random.nextLong(); int[] res = new int[num]; double[] temp=new double[num]; double sum = 0; int sum2 = 0; for (int i = 0; i < num; i++) { temp[i] = random.nextDouble(); sum += temp[i]; } for (int i = 0; i < num; i++) { res[i] = 1+ (int)(temp[i] / sum * (money-num)); sum2 += res[i]-1; } res[random.nextInt(num)]+=money-sum2-num; return res; } public static void show(int[] red_packet){ System.out.println('紅包 : ' + Arrays.toString(red_packet)); } public static void main(String[] args) { int num, money; Scanner scanner = new Scanner(System.in); now_time = System.currentTimeMillis(); Random init_random = new Random(now_time); seed = init_random.nextLong(); System.out.println('請輸入要分發的紅包數量:'); num = scanner.nextInt(); System.out.println('請輸入要分發的紅包總金額(分):'); money = scanner.nextInt(); int a[] = get_red_packets(money,num); show(a); }}

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