Leetcode_881_救生艇_双指针

import java.util.Arrays;

class Solution {
    public int numRescueBoats(int[] people, int limit) {
        int len = people.length;
        int ans = 0;
        Arrays.sort(people);
        int l = 0;
        int r = len - 1;
        while (l <= r) {
            if (people[l] + people[r] <= limit) {
                l++;
            }
            r--;
            ans++;
        }
        return ans;
    }
}