Submission #642107

#	Time	Username	Problem	Language	Result	Execution time	Memory
642107		piOOE	The Big Prize (IOI17_prize)	C++17	20 / 100	72 ms	2120 KiB

prize

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

using namespace std;
using ll = long long;

int find_best(int n) {
    int i = 0;
    map<int, vector<int>> mp;
    int Q = 0;
    auto  my_ask = [&](int i) {
        if (mp.count(i)) {
            return mp[i];
        } else {
            ++Q;
            if (Q > 8000) {
                assert(false);
            }
            mp[i] = ask(i);
            return mp[i];
        }
    };
    map<int, int> cnt;
    for (; i < n;) {
        auto a = my_ask(i);
        int sum = a[0] + a[1];
        if (sum == 0) {
            return i;
        } else {
            ++cnt[sum];
            if (cnt[sum] > 100) {
                for (int j = __lg(n) + 1; j > -1; --j) {
                    if (i + (1 << j) < n && my_ask(i + (1 << j)) == a) {
                        i += 1 << j;
                    }
                }
                ++i;
            } else {
                i += 1;
            }
        }
    }
    assert(false);
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 80