Submission #402152

#	Time	Username	Problem	Language	Result	Execution time	Memory
402152		IloveN	Hotter Colder (IOI10_hottercolder)	C++14	75 / 100	614 ms	12784 KiB

hottercolder

#include<bits/stdc++.h>
#include "grader.h"

using namespace std;
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define all(vr) vr.begin(),vr.end()
#define vi vector<int>
#define vll vector<ll>
namespace myrand
{
    mt19937 mt(chrono::system_clock::now().time_since_epoch() / chrono::microseconds(1));
    ll Int(ll l,ll r) {return uniform_int_distribution<ll> (l,r)(mt);}
}

using namespace myrand;
const int N = 1e5 + 10;

/*int ans, pv;

int Guess(int x)
{
    if (x < 0 || x > 500)
    {
        cout << "SS\n";
    }
    int val = abs(x - ans), res;
    if (pv == -1 || val == pv) res = 0;
    if (val < pv) res = 1;
    if (val > pv) res = -1;
    pv = val;
    return res;
}*/

int HC(int n){
    if (n == 1) return 1;
    Guess(1);
    int g = Guess(n);
    int prv = n;
    int side, l = 1, r = n; // 0 = left, 1 = right
    if (g == 0) return (n + 1) / 2;
    if (g == 1) side = 1, l = (n + 1) / 2 + 1;
    else side = 0, r = n / 2;
    if (side == 0)
        while (r - l + 1 > 3)
        {
            Guess(1);
            int mid = r / 4 + 1;
            g = Guess(mid * 2 - 1);
            if (g == 0) return mid;
            if (g == -1) r = mid - 1;
            else
            {
                l = mid + 1;
                for (int i = 1; i <= 2; ++i)
                {
                    Guess(l);
                    g = Guess(r);
                    prv = r;
                    if (g == 0) return (l + r) / 2;
                    if (g == 1) l = (l + r) / 2 + 1;
                    else r = (l + r - 1) / 2;
                }
                break;
            }
        }
    else
        while (r - l + 1 > 3)
        {
            Guess(n);
            int mid = n - (n - l + 1) / 4;
            g = Guess(mid * 2 - n);
            if (g == 0) return mid;
            if (g == -1) l = mid + 1;
            else
            {
                r = mid - 1;
                for (int i = 1; i <= 2; ++i)
                {
                    Guess(l);
                    g = Guess(r);
                    prv = r;
                    if (g == 0) return (l + r) / 2;
                    if (g == 1) l = (l + r) / 2 + 1;
                    else r = (l + r - 1) / 2;
                }
                break;
            }
        }
    if (r - l + 1 <= 3)
    {
        Guess(l);
        g = Guess(r);
        if (g == 0) return (l + r) / 2;
        if (g == 1) return r;
        return l;
    }
    while (l < r)
    {
        int mid = (l + r) / 2;
        if (prv <= l)
        {
            g = Guess(r + l - prv);
            prv = r + l - prv;
            if (g == 0) return mid;
            if (g == -1) r = mid;
            else l = mid + 1;
        }
        else
        {
            g = Guess(l - (prv - r));
            prv = l - (prv - r);
            if (g == 0) return mid;
            if (g == -1) l = mid + 1;
            else r = mid;
        }
    }
    return l;
}

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 0 / 25