Submission #895245

#	Time	Username	Problem	Language	Result	Execution time	Memory
895245		Irate	Hotter Colder (IOI10_hottercolder)	C++14	79 / 100	607 ms	8020 KiB

hottercolder

#include<bits/stdc++.h>
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int Guess(int n);
// int lastG = -1, X;
// int cnt = 0;
// int Guess(int n){
//     cnt++;
//     // cout << "GUESS: " << lastG << ", " << n << '\n';
//     if(lastG == -1 || abs(X - lastG) == abs(X - n)){
//         lastG = n;
//         return 0;
//     }
//     if(abs(X - lastG) > abs(X - n)){
//         lastG = n;
//         return 1;
//     }
//     lastG = n;
//     return -1;
// }
int HC(int n){
    int l = 1, r = n;
    int last = 1;
    int R = rng() % 2;
    if(R % 2 == 0){
        last = 1;
        Guess(1);
    }
    else{
        last = n;
        Guess(n);
    }
    while(l < r){
        int mid = (l + r) >> 1;
        // cout << l << ", " << r << ": " << last << '\n';
        if(last == l){
            int num = Guess(r);
            last = r;
            // cout << "NUM: " << num << '\n';
            if(num == -1){
                if((l + r) % 2)r = mid;
                else r = mid - 1;
                if(l == r)return l;
                int R = rng() % 2;
                if(R == 0){
                    Guess(l);
                    last = l;
                }
                else{
                    Guess(r);
                    last = r;
                }
                
            }
            else if(num == 1){
                l = mid + 1;
                if(l == r)return l;
            }
            else{
                return (l + r) >> 1;
            }
        }
        else{
            int num = Guess(l);
            last = l;
            // cout << "NUM: " << num << '\n';
            if(num == 1){
                if((l + r) % 2)r = mid;
                else r = mid - 1;
                if(l == r)return l;
            }
            else if(num == -1){
                l = mid + 1;
                if(l == r)return l;
                int R = rng() % 2;
                if(R == 0){
                    Guess(r);
                    last = r;
                }
                else{
                    Guess(l);
                    last = l;
                }
            }
            else return (l + r) >> 1;
        }
    }
    return l;
}
// int main(){
//     int COUNTER = 0;
//     for(int i = 1;i <= 500;++i){
//         for(int j = 1;j <= i;++j){
//             X = j;
//             cnt = 0;
//             lastG = -1;
//             int found_num = HC(i);
//             if(found_num != j){
//                 cout << "Wrong Answer: " << i << ", " << j << '\n';
//                 cout << "FOUND: " << found_num << '\n';
//                 break;
//             }
//             else if(cnt > 15){
//                 COUNTER++;
//                 cout << i << ", " << j << ": " << cnt << '\n';
//             }
//         }
//     }
//     cout << COUNTER;
// }

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