title: Ways Remove One Element Binary String Xor Becomes Zero
signature: function ways_remove_one_element_binary_string_xor_becomes_zero(str)
test_code: using Printf
  
  # SOLUTION CODE
  # ============================================
  PLACEHOLDER_CODE_BODY
  
  # TESTING CODE 
  # ============================================
  function validate_solution(actual, expected)
      return actual == expected
  end
  
  function driver(str, expected)
      try
  
          if validate_solution(PLACEHOLDER_FN_NAME(str), expected)
              return "PASSED";
          end
          return "FAILED";
      catch exception_obj
          return string(Base.typename(typeof(exception_obj)).wrapper);
      end
  end
  
  function main()
      
      result = driver("KfcTJNP", 7);
      @printf("TEST-0...%s\n",result);
      
      result = driver("05312505872", 1);
      @printf("TEST-1...%s\n",result);
      
      result = driver("100111", 2);
      @printf("TEST-2...%s\n",result);
      
      result = driver("tDEEhKxrQ", 9);
      @printf("TEST-3...%s\n",result);
      
      result = driver("50824233019", 1);
      @printf("TEST-4...%s\n",result);
      
      result = driver("10001110010", 5);
      @printf("TEST-5...%s\n",result);
      
      result = driver("T SEZaNm MYQ", 12);
      @printf("TEST-6...%s\n",result);
      
      result = driver("838415739", 1);
      @printf("TEST-7...%s\n",result);
      
      result = driver("01110100", 4);
      @printf("TEST-8...%s\n",result);
      
      result = driver("WYQiAey H", 9);
      @printf("TEST-9...%s\n",result);
      
  end
  
  main()
source_py: def ways_remove_one_element_binary_string_xor_becomes_zero(str):
      one_count = 0
      zero_count = 0
      n = len(str)
      for i in range(0, n, 1):
          if (str[i] == '1'):
              one_count += 1
          else:
              zero_count += 1
      if ((one_count % 2) == 0):
          return zero_count
      return one_count
source_cpp: int ways_remove_one_element_binary_string_xor_becomes_zero(string str) {
    int one_count = 0, zero_count = 0;
    int n = str . length ( );
    for ( int i = 0;
    i < n;
    i ++ ) if ( str [ i ] == '1' ) one_count ++;
    else zero_count ++;
    if ( one_count % 2 == 0 ) return zero_count;
    return one_count;
  }