View Compilation Error

0_0_37054346_26768.cpp: In function 'int main()':
0_0_37054346_26768.cpp:15:24: error: 'n' was not declared in this scope
         for(int i=1;i<=n;i++){
                        ^
0_0_37054346_26768.cpp:16:19: error: 'm' was not declared in this scope
    for(int j=1;j<=m;j++){
                   ^