/in/foo.cc: In function 'int main()':
/in/foo.cc:71:16: warning: iteration 3000 invokes undefined behavior [-Waggressive-loop-optimizations]
   if(dp[1][1][i])minx = min(minx,abs(p - i));
      ~~~~~~~~~~^
/in/foo.cc:70:18: note: within this loop
  for(int i = 0;i < MAXN;i ++){
                ~~^~~~~~