运行 ID: 435282

Main.cc: In function ‘int main()’:
Main.cc:7:7: error: ‘s1’ was not declared in this scope
  cin>>s1>>s2;
       ^~
Main.cc:7:7: note: suggested alternative: ‘l1’
  cin>>s1>>s2;
       ^~
       l1
Main.cc:7:11: error: ‘s2’ was not declared in this scope
  cin>>s1>>s2;
           ^~
Main.cc:7:11: note: suggested alternative: ‘s’
  cin>>s1>>s2;
           ^~
           s
Main.cc:11:5: warning: statement has no effect [-Wunused-value]
    n-i;
    ~^~