largestperimeter.cpp

class Solution {
public:
    int largestPerimeter(vector<int>& A) {
        sort(A.begin(), A.end());
        for (int i = A.size() - 1 ; i > 1; --i)
            if (A[i] < A[i - 1] + A[i - 2])
                return A[i] + A[i - 1] + A[i - 2];
        return 0;
        
    }
};