foo.cc: In function 'int pdxt(int*, int)':
foo.cc:26:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   if(tp[n-1]=tp[n])
      ~~~~~~~^~~~~~
foo.cc: In function 'int main()':
foo.cc:35:36: warning: variable 'tmp' set but not used [-Wunused-but-set-variable]
  int a[1000000];int b[1000000];int tmp[10000000];
                                    ^~~
foo.cc:36:6: warning: variable 'ta' set but not used [-Wunused-but-set-variable]
  int ta[1000000];
      ^~
foo.cc:45:6: warning: unused variable 'pxwd' [-Wunused-variable]
  int pxwd=paixu(b,k);//先排完序
      ^~~~

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