Submission #530759

#	Time	Username	Problem	Language	Result	Execution time	Memory
530759		Cyanmond	Roller Coaster Railroad (IOI16_railroad)	C++17	0 / 100	155 ms	13580 KiB

railroad

#include <bits/stdc++.h>

using i64 = long long;
template <typename T> using Vec = std::vector<T>;

constexpr int inf = 1100000000;
constexpr i64 inf64 = 2000000000000000000;

template <typename T> bool setmin(T &a, const T v) {
    if (a > v) {
        a = v;
        return true;
    }
    return false;
}

long long plan_roller_coaster(std::vector<int> S, std::vector<int> T) {
    const int N = (int)S.size();
    std::vector<int> order(N);
    std::iota(order.begin(), order.end(), 0);
    const int min_id = *std::min_element(order.begin(), order.end(), [&](const int a, const int b) {
        if (S[a] != S[b])
            return S[a] < S[b];
        else
            return T[a] < T[b];
    });

    std::multiset<std::pair<int, int>> set;
    for (int i = 0; i < N; ++i)
        if (i != min_id) set.insert({S[i], T[i]});
    bool answer = true;
    int now_t = T[min_id];
    assert((int)set.size() == N - 1);
    while (not set.empty()) {
        auto itr = set.lower_bound({now_t, -inf});
        if (itr != set.end()) {
            now_t = itr->second;
            set.erase(itr);
        } else {
            answer = false;
            break;
        }
    }

    // subtask 3
    return answer ? 0 : 1;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 23
• Subtask 3: 0 / 30
• Subtask 4: 0 / 36