[LeetCode C++] 881. Boats to Save People

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