foo.cc: In function 'void work_1(int)':
foo.cc:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0;i<s[now].size();i++)
                  ~^~~~~~~~~~~~~~
foo.cc: In function 'void work_2(int)':
foo.cc:63:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0;i<s[now].size();i++)
                  ~^~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:77:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d%d",&x,&y);
             ~~~~~^~~~~~~~~~~~~~

正在同步测试数据，请稍后
自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。