Create count-good-triplets.cpp

Author: kamyu104

C++/count-good-triplets.cpp

@@ -0,0 +1,21 @@
+// Time:  O(n^3)
+// Space: O(1)
+
+class Solution {
+public:
+    int countGoodTriplets(vector<int>& arr, int a, int b, int c) {
+        int result = 0;
+        for (int i = 0; i + 2 < arr.size(); ++i) {
+            for (int j = i + 1; j + 1 < arr.size(); ++j) {
+                for (int k = j + 1; k < arr.size(); ++k) {
+                    if (abs(arr[i] - arr[j]) <= a &&
+                        abs(arr[j] - arr[k]) <= b &&
+                        abs(arr[k] - arr[i]) <= c) {
+                        ++result;
+                    }
+                }
+            }
+        }
+        return result;
+    }
+};