View Compilation Error

0_0_34382218_19286.cpp: In function 'int main()':
0_0_34382218_19286.cpp:22:6: error: 'n' was not declared in this scope
   if(n==0 && m==0 && t==0)
      ^
0_0_34382218_19286.cpp:22:14: error: 'm' was not declared in this scope
   if(n==0 && m==0 && t==0)
              ^