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Submission #402029

# Submission time Handle Problem Language Result Execution time Memory
402029 2021-05-11T08:19:24 Z phathnv Hotter Colder (IOI10_hottercolder) C++11
81 / 100
 736 ms 8100 KB 
#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
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 1228 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 1292 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 1228 KB Output is correct

Subtask #4
6.0 / 25.0

# Verdict Execution time Memory Grader output
1 Partially correct 736 ms 8100 KB Output is partially correct - alpha = 0.250000000000