运行 ID: 41565

Main.cc: In function ‘void pingxuan()’:
Main.cc:35:6: error: ‘sum’ was not declared in this scope
   if(sum==1) return;
      ^~~
Main.cc: In function ‘int main()’:
Main.cc:45:10: warning: right operand of comma operator has no effect [-Wunused-value]
  cin>>m,n;
          ^
Main.cc:49:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0;j<=str.size();j++){
               ~^~~~~~~~~~~~