Create closest-node-to-path-in-tree.cpp

Author: kamyu104

C++/closest-node-to-path-in-tree.cpp

@@ -0,0 +1,10 @@
+// Time:  O(n)
+// Space: O(1)
+
+// string
+class Solution {
+public:
+    int percentageLetter(string s, char letter) {
+        return 100 * count(cbegin(s), cend(s), letter) / size(s);
+    }
+};