View Compilation Error

0_0_36206398_21344.cpp: In function 'int main()':
0_0_36206398_21344.cpp:41:23: error: 'n' was not declared in this scope
         scanf("%d%d",&n,&m);
                       ^
0_0_36206398_21344.cpp:41:26: error: 'm' was not declared in this scope
         scanf("%d%d",&n,&m);
                          ^