Create counting-words-with-a-given-prefix.cpp

Author: kamyu104

C++/counting-words-with-a-given-prefix.cpp

@@ -0,0 +1,13 @@
+// Time:  O(n * p)
+// Space: O(1)
+
+// string
+class Solution {
+public:
+    int prefixCount(vector<string>& words, string pref) {
+        return count_if(cbegin(words), cend(words),
+                        [&pref](const auto& x) {
+                            return x.compare(0, size(pref), pref) == 0;
+                        });
+    }
+};