View Compilation Error

0_0_28237811_24503.cpp: In function 'int main()':
0_0_28237811_24503.cpp:21:3: error: 'else' without a previous 'if'
   else 
   ^
0_0_28237811_24503.cpp:23:2: error: expected primary-expression before '}' token
  }
  ^