Submission #402029

#	Time	Username	Problem	Language	Result	Execution time	Memory
402029		phathnv	Hotter Colder (IOI10_hottercolder)	C++11	81 / 100	736 ms	8100 KiB

hottercolder

#include "grader.h"
#include<iostream>

int HC(int n){
    if (n == 1)
        return 1;
    int l, r, mid = (n + 1) / 2, pre = mid + 1;
    Guess(mid);
    if (Guess(mid + 1) == 1)
        l = mid + 1, r = n;
    else
        l = 1, r = mid;
    while (l < r){
        //std::cerr << l << ' ' << r << ' ' << pre << std::endl;
        mid = (l + r + (pre <= l)) >> 1;
        int nxt = 2 * mid - pre;
        if (nxt < 1)
            nxt = 1;
        if (nxt > n)
            nxt = n;
        mid = (pre + nxt) / 2;
        int d = ((pre + nxt) % 2 == 0);
        //std::cerr << mid << ' ' << nxt << ' ' << d << std::endl;
        int x = Guess(nxt);
        if (x == 0)
            return mid;
        if (pre < nxt){
            if (x == 1)
                l = mid + d;
            else
                r = mid - d;
        } else {
            if (x == 1)
                r = mid - d;
            else
                l = mid + d;
        }
        pre = nxt;
    }
    return l;
}

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 6 / 25