View Compilation Error

0_0_39124697_24622.cpp: In function 'int main()':
0_0_39124697_24622.cpp:9:15: error: 'n' was not declared in this scope
    9 |    while(cin>>n>>m)
      |               ^
0_0_39124697_24622.cpp:9:18: error: 'm' was not declared in this scope
    9 |    while(cin>>n>>m)
      |                  ^