Main.cc: In function 'int main()':
Main.cc:4:6: error: 'n' was not declared in this scope
cin>>n>>m;
^
Main.cc:4:9: error: 'm' was not declared in this scope
cin>>n>>m;
^
Main.cc:8:13: error: 'a' was not declared in this scope
cin>>a[j][i];
^
Main.cc:13:14: error: 'a' was not declared in this scope
cout<