Submission #1018486

#	Time	Username	Problem	Language	Result	Execution time	Memory
1018486		socpite	Hotter Colder (IOI10_hottercolder)	C++14	91.67 / 100	437 ms	8048 KiB

hottercolder

#include "grader.h"
#include <bits/stdc++.h>
using namespace std;

mt19937 rng(69420);

int n;

int solve(int l, int r, int prv){
   // cout << l << " " << r << " " << prv << endl;
   if(l == r)return l;
   if(l == 1){
      if(r <= 3){
         int tmp = Guess(1);
         if(tmp == 1)return 1;
         if(tmp == 0)return 2;
         return r;
      }
      int dist = (r - l + 1)/4, g = max(1, dist - 2);
      int tmp = Guess(g);
      if(tmp == -1)return solve((g+r)/2 + 1, r, g);
      if(tmp == 0)return (g+r)/2;
      tmp = Guess(g+2);
      if(tmp == 0)return g+1;
      if(tmp == -1)return solve(1, g+2, g+2);
      return solve(g+2, (g+r-1)/2, g+2);
   }
   else if(r == n){
      if(r - l + 1 <= 3){
         int tmp = Guess(n);
         if(tmp == 1)return n;
         if(tmp == 0)return n-1;
         return l;
      }
      int dist = (r - l + 1)/4, g = min(n, r - dist + 3);
      int tmp = Guess(g);
      if(tmp == -1)return solve(l, (l+g-1)/2, g);
      if(tmp == 0)return (l+g)/2;
      tmp = Guess(g-2);
      if(tmp == 0)return g-1;
      if(tmp == -1)return solve(g-2, r, g-2);
      return solve((g+l)/2 + 1, g-2, g-2);
   }
   else {
      int mid = (l+r)>>1;
      if(prv == mid){
         int tmp = Guess(prv + 2);
         if(tmp == -1)return solve(l, prv, prv+2);
         if(tmp == 0)return prv+1;
         if(tmp == 1)return solve(prv+2, r, prv+2);
      }
      int qq = max(1, 2*mid - prv);
      qq = min(qq, n);
      int tmp = Guess(qq);
      if(prv < mid)tmp*=-1;
      if(tmp == -1)return solve((qq + prv)/2 + 1, r, qq);
      if(tmp == 0)return (qq+prv)/2;
      return solve(l, (qq+prv-1)/2, qq);
   }
}

int HC(int N){
   n = N;
   if(n <= 3){
      Guess(n);
      return solve(1, n, 1);
   }
   else {
      int mid = n/2;
      Guess(mid-1);
      int tmp = Guess(mid+1);
      if(tmp == 0)return mid;
      if(tmp == 1)return solve(mid+1, n, mid+1);
      return solve(1, mid+1, mid+1);
   }
}

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 16.6666666675 / 25