Run id: 139521

Main.cc: In function 'int a(int)':
Main.cc:9:20: error: 'n' was not declared in this scope
     for(int i=2;i<=n;i++){
                    ^
Main.cc:20:5: warning: no return statement in function returning non-void [-Wreturn-type]
     }
     ^
Main.cc: In function 'int main()':
Main.cc:25:11: error: 'b' was not declared in this scope
     cout<