New C++ Solution "Largest Perimeter Triangle"

Author: yue2388253

algorithms/cpp/largestPerimeterTriagnle/largestPerimeterTriangle.cpp

@@ -0,0 +1,13 @@
+class Solution {
+public:
+    int largestPerimeter(vector<int>& A) {
+        if (A.size() < 3) return 0;
+        sort(A.begin(), A.end(), greater<int>());
+        for (auto it = A.begin(); it != A.end() - 2; ++it) {
+            if (*it < *(it + 1) + *(it + 2))
+                return *it + *(it + 1) + *(it + 2);            
+        }
+        return 0;
+    }
+};
+