881. Boats to Save People
class Solution { public: int numRescueBoats(vector<int>& people, int limit) { sort(people.begin(), people.end()); int res = 0; for (int i = 0, j = people.size()-1; i <= j; ) { if (people[i] + people[j] <= limit) { i++; j--; } else j--; res++; } return res; } };
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