View Compilation Error

0_0_21837992_21590.cpp: In function 'int main()':
0_0_21837992_21590.cpp:13:14: error: 'n' was not declared in this scope
         cin>>n>>m>>len;
              ^
0_0_21837992_21590.cpp:13:17: error: 'm' was not declared in this scope
         cin>>n>>m>>len;
                 ^
0_0_21837992_21590.cpp:40:13: error: expected '}' at end of input
     return 0;
             ^