Submission #511523

#	Time	Username	Problem	Language	Result	Execution time	Memory
511523		KoD	Bajka (COCI20_bajka)	C++17	70 / 70	258 ms	3776 KiB

bajka

#include <bits/stdc++.h>

using std::vector;
using std::array;
using std::pair;
using std::tuple;

template <class F> struct RecLambda : private F {
    explicit RecLambda(F&& f) : F(std::forward<F>(f)) {}
    template <class... Args> decltype(auto) operator()(Args&&... args) const {
        return F::operator()(*this, std::forward<Args>(args)...);
    }
};

template <class T> using Heap = std::priority_queue<T, vector<T>, std::greater<>>;

constexpr int inf = std::numeric_limits<int>::max() / 2;

bool setmin(int& x, const int y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int N, M;
    std::cin >> N >> M;
    vector<char> S(N), T(M);
    for (auto& x : S) {
        std::cin >> x;
    }
    for (auto& x : T) {
        std::cin >> x;
    }
    vector dp(M, vector(N, inf));
    Heap<tuple<int, int, int>> que;
    const auto push = [&](const int m, const int i, const int d) {
        if (setmin(dp[m][i], d)) {
            que.emplace(d, m, i);
        }
    };
    for (int i = 0; i < N; ++i) {
        push(M - 1, i, 0);
    }
    while (!que.empty()) {
        const auto [d, m, i] = que.top();
        que.pop();
        if (d > dp[m][i]) {
            continue;
        }
        if (m > 0 and T[m] == S[i]) {
            if (i > 0) {
                push(m - 1, i - 1, d + 1);
            }
            if (i + 1 < N) {
                push(m - 1, i + 1, d + 1);
            }
        }
        for (int j = 0; j < N; ++j) {
            if (S[i] == S[j]) {
                push(m, j, d + std::abs(i - j));
            }
        }
    }
    int ans = inf;
    for (int i = 0; i < N; ++i) {
        if (T[0] == S[i]) {
            setmin(ans, dp[0][i]);
        }
    }
    std::cout << (ans == inf ? -1 : ans) << '\n';
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 50 / 50