Main.cc: In function ‘int main()’: Main.cc:12:7: error: ‘n1’ was not declared in this scope cin>>n1>>m1; ^~ Main.cc:12:7: note: suggested alternative: ‘n’ cin>>n1>>m1; ^~ n Main.cc:12:11: error: ‘m1’ was not declared in this scope cin>>n1>>m1; ^~ Main.cc:12:11: note: suggested alternative: ‘m’ cin>>n1>>m1; ^~ m