foo.cc: In function 'int main()':
foo.cc:38:13: warning: unused variable 'j' [-Wunused-variable]
  int T,ti,i,j;
             ^
foo.cc:41:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&T);
  ~~~~~^~~~~~~~~
foo.cc:45:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d%d",&t[i].x,&t[i].y);
    ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。