Submission #54019

#	Time	Username	Problem	Language	Result	Execution time	Memory
54019		chpipis	The Big Prize (IOI17_prize)	C++11	20 / 100	46 ms	1636 KiB

prize

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

using namespace std;

typedef vector<int> vi;

int num_q;
map<int, vi> memo;

vi query(int x) {
    if (memo.count(x)) return memo[x];
    num_q++;
    vi ret = ask(x);
    return memo[x] = ret;
}

int find_best(int n) {
    memo.clear();
    num_q = 0;
    for (int i = 0, j; i < n; i = j + 1) {
        if (i == n - 1) return i;
        j = i;
        vi cur = query(i);
        if (cur[0] + cur[1] == 0) return i;
        int lo = i + 1, hi = n - 1;
        while (lo <= hi) {
            int mid = (lo + hi) >> 1;
            if (query(mid) == cur) {
                lo = mid + 1;
                j = mid;
            } else {
                hi = mid - 1;
            }
        }
    }
    return -1;
}

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