title: Nth Even Length Palindrome
signature: string nthEvenLengthPalindrome(string n) {
test_code: #include <algorithm>
  #include <assert.h>
  #include <cstdlib>
  #include <iostream>
  #include <map>
  #include <set>
  #include <string>
  #include <tuple> 
  #include <unordered_map>
  #include <vector>
  #include <math.h>
  #include <cmath>
  #include <bits/stdc++.h>
  #include <numeric>
  #include <functional>
  
  using namespace std;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  bool validateSolution(string actual, string expected){
      return actual == expected;
  }
  
  string driver(string n, string expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(n), expected)){
              return "PASSED";
          }
          return "FAILED";
      }
      catch (const std::overflow_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::runtime_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::exception& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (...)
      {
          return "UNK_ERROR";
      }
  }
  
  int main() {
      string result = "";
  
      result = driver("lSUhEvxcgfI", "lSUhEvxcgfIIfgcxvEhUSl"); 
      cout << "TEST-" << 0 << "..."
           <<  result
           << "\n";
  
      result = driver("77329283", "7732928338292377"); 
      cout << "TEST-" << 1 << "..."
           <<  result
           << "\n";
  
      result = driver("010111111", "010111111111111010"); 
      cout << "TEST-" << 2 << "..."
           <<  result
           << "\n";
  
      result = driver("Stazb", "StazbbzatS"); 
      cout << "TEST-" << 3 << "..."
           <<  result
           << "\n";
  
      result = driver("0702", "07022070"); 
      cout << "TEST-" << 4 << "..."
           <<  result
           << "\n";
  
      result = driver("01111111", "0111111111111110"); 
      cout << "TEST-" << 5 << "..."
           <<  result
           << "\n";
  
      result = driver("a", "aa"); 
      cout << "TEST-" << 6 << "..."
           <<  result
           << "\n";
  
      result = driver("rznb", "rznbbnzr"); 
      cout << "TEST-" << 7 << "..."
           <<  result
           << "\n";
  
      return 0;
  }
source_py: def nth_even_length_palindrome(n):
      res = n
      for j in range((len(n) - 1), (- 1), (- 1)):
          res += n[j]
      return res
source_cpp: string nth_even_length_palindrome(string n) {
    string res = n;
    for ( int j = n . length ( ) - 1;
    j >= 0;
    -- j ) res += n [ j ];
    return res;
  }