运行 ID: 75561

Main.cc: In function ‘int main()’:
Main.cc:7:20: error: ‘n’ was not declared in this scope
     for(int i=1;i<=n;++i){
                    ^
Main.cc:11:20: error: ‘n’ was not declared in this scope
     for(int i=1;i<=n;++i) {
                    ^