Submission #860501

#	Time	Username	Problem	Language	Result	Execution time	Memory
860501		The_Samurai	Toll (BOI17_toll)	C++17	0 / 100	3052 ms	6076 KiB

toll

#include "bits/stdc++.h"

using namespace std;
using ll = long long;
const int inf = 1e9;

int main() {
    cin.tie(0)->sync_with_stdio(false);
#ifdef sunnatov
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    int n, m, k, q;
    cin >> k >> n >> m >> q;
    vector queries(n, vector<pair<int, int>>());
    vector<int> ans(q);
    vector<vector<pair<int, int>>> out(n);
    while (m--) {
        int u, v, t;
        cin >> u >> v >> t;
        out[u].emplace_back(v, t);
    }
    for (int i = 0; i < q; i++) {
        int u, v;
        cin >> u >> v;
        queries[u].emplace_back(v, i);
    }
    vector dist(k, vector(n, inf));
    for (int i = n - 1; i / k == (n - 1) / k; i--) dist[i % k][i] = 0;
    for (int i = (n - 1) / k; i >= 0; i--) {
        int left = k * i, right = min(n - 1, k * (i + 1) - 1);
        vector new_dist(k, vector(n, inf));
        for (int u = left; u <= right; u++) {
            new_dist[u % k][u] = 0;
            for (auto [v, t]: out[u]) {
                for (int j = u; j < n; j++) {
                    new_dist[u % k][j] = min(new_dist[u % k][j], dist[v % k][j] + t);
                }
            }
            for (auto [v, j]: queries[u]) {
                ans[j] = new_dist[u % k][v];
            }
        }
        dist = new_dist;
    }
    for (int i = 0; i < q; i++) cout << (ans[i] == inf ? -1 : ans[i]) << '\n';
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 31
• Subtask 5: 0 / 44