/in/foo.cc: In function 'int main()':
/in/foo.cc:110:6: warning: variable 'temp' set but not used [-Wunused-but-set-variable]
  int temp=0,ans=0;
      ^~~~
/in/foo.cc:80:8: warning: iteration 100000 invokes undefined behavior [-Waggressive-loop-optimizations]
   ok[i]=1;
   ~~~~~^~
/in/foo.cc:78:16: note: within this loop
  for (int i=1;i<=100001;++i)
               ~^~~~~~~~
/in/foo.cc:51:9: warning: iteration 100000 invokes undefined behavior [-Waggressive-loop-optimizations]
   pre[i]=0;
   ~~~~~~^~
/in/foo.cc:49:16: note: within this loop
  for (int i=1;i<=100001;++i)
               ~^~~~~~~~
/in/foo.cc:21:8: warning: iteration 100000 invokes undefined behavior [-Waggressive-loop-optimizations]
   ok[i]=1;
   ~~~~~^~
/in/foo.cc:19:16: note: within this loop
  for (int i=1;i<=100001;++i)
               ~^~~~~~~~