Submission #127019

#	Time	Username	Problem	Language	Result	Execution time	Memory
127019		Vlatko	The Big Prize (IOI17_prize)	C++14	20 / 100	104 ms	508 KiB

prize

#include "prize.h"
// #include "grader.cpp"
#include <bits/stdc++.h>
using namespace std;

typedef pair<int, int> pii;


int find_best(int n) {
    vector<pii> cur, nxt;
    cur.emplace_back(0, n-1);
    while (!cur.empty()) {
        nxt.clear();
        sort(cur.begin(), cur.end(), [&] (pii& a, pii& b) {
            int sza = a.second-a.first;
            int szb = b.second-b.first;
            if (sza != szb) return sza < szb;
            return a.first < b.first;
        });
        for (auto& p : cur) {
            int l = p.first, r = p.second;
            if (l == r) {
                vector<int> res = ask(l);
                if (res[0] == 0 && res[1] == 0) {
                    return l;
                }
            } else {
                int m = (l + r) / 2;
                vector<int> res = ask(m);
                if (res[0] == 0 && res[1] == 0) {
                    return m;
                } else if (res[0] == 1 && res[1] == 0) {
                    nxt.emplace_back(l, m);
                } else if (res[0] == 0 && res[1] == 1) {
                    nxt.emplace_back(m+1, r);
                } else {
                    nxt.emplace_back(l, m);
                    nxt.emplace_back(m+1, r);
                }
            }
        }
        swap(cur, nxt);
    }
    return 0;
}

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