881. Boats to Save People

class Solution {
public:
    int numRescueBoats(vector<int>& people, int limit) {
        sort(people.begin(),people.end());
        int l=0;
        int h=people.size()-1;
    int cnt=0;
        while(l<=h)
        {
            if(people[l]+people[h]<=limit)
            {
                l++;
                h--;
            }
            else
            {
                h--;
            }
            cnt++;
        }
        return cnt;
    }
};