1using System;
2
3public class RescueBoats {
4    public int NumRescueBoats(int[] people, int limit) {
5        Array.Sort(people);
6        int i = 0, j = people.Length - 1;
7        int boats = 0;
8        while (i <= j) {
9            if (people[i] + people[j] <= limit) i++;
10            j--;
11            boats++;
12        }
13        return boats;
14    }
15    public static void Main() {
16        int[] people = {3, 2, 2, 1};
17        int limit = 3;
18        RescueBoats rb = new RescueBoats();
19        Console.WriteLine(rb.NumRescueBoats(people, limit));
20    }
21}

1import