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+/*
+Challenge 207
+
+Task 1: Keyboard Word
+Submitted by: Mohammad S Anwar
+
+You are given an array of words.
+
+Write a script to print all the words in the given array that can be types
+using alphabet on only one row of the keyboard.
+
+Let us assume the keys are arranged as below:
+
+Row 1: qwertyuiop
+Row 2: asdfghjkl
+Row 3: zxcvbnm
+
+Example 1
+
+Input: @words = ("Hello","Alaska","Dad","Peace")
+Output: ("Alaska","Dad")
+
+Example 2
+
+Input: @array = ("OMG","Bye")
+Output: ()
+*/
+
+#include <algorithm>
+#include <cctype>
+#include <iostream>
+#include <string>
+
+void remove_char(std::string& word, int ch) {
+    word.erase(std::remove(word.begin(), word.end(), tolower(ch)), word.end());
+}
+
+bool can_type_word(const std::string& keys, const std::string& word_) {
+    std::string word;
+    for (auto& ch : word_)
+        word.push_back(tolower(ch));
+    for (auto& ch : keys)
+        remove_char(word, tolower(ch));
+    return word.size() == 0;
+}
+
+bool can_type(const std::string& word) {
+    return can_type_word("qwertyuiop", word) ||
+           can_type_word("asdfghjkl", word) ||
+           can_type_word("zxcvbnm", word);
+}
+
+int main(int argc, char* argv[]) {
+    argv++; argc--;
+    for (int i = 0; i < argc; i++)
+        if (can_type(argv[i]))
+            std::cout << argv[i];
+    std::cout << std::endl;
+}