Submission #550041

#	Time	Username	Problem	Language	Result	Execution time	Memory
550041		palilo	Cave (IOI13_cave)	C++17	0 / 100	295 ms	340 KiB

cave

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

void exploreCave(int n) {
    using namespace std;
    vector s(n, -1), d(n, -1), vec(n, 0);
    auto solve = [&](int door_id) {
        // determine [start, n)
        transform(s.begin(), s.end(), vec.begin(), [&](const auto& x) {
            return x == -1 ? 0 : x;
        });
        const int correct {tryCombination(vec.data()) == door_id};
        const auto wrong = !correct;
        // auto interval {views::iota(0, n) | views::filter([&](const auto& i) { return s[i] == -1; })};
        int lo = 0, hi = n - door_id;
        while (lo != hi) {
            const auto mid = (lo + hi) >> 1;
            int id = 0;
            for (int i = 0; i < n; ++i) {
                if (s[i] != -1) continue;
                vec[i] = id++ < mid ? correct : wrong;
            }
            // for (const auto& x : interval | views::take(mid)) {
            //     vec[x] = correct;
            // }
            // for (const auto& x : interval | views::drop(mid)) {
            //     vec[x] = wrong;
            // }
            tryCombination(vec.data()) == door_id ? hi = mid : lo = mid + 1;
        }
        s[lo] = correct;
        d[lo] = door_id;
    };
    for (int i = 0; i < n; ++i) {
        solve(i);
    }
    // for (const auto& i : views::iota(0, n)) {
    //         solve(i);
    // }
    answer(s.data(), d.data());
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 30
• Subtask 5: 0 / 24