Submission #1306301

#	Time	Username	Problem	Language	Result	Execution time	Memory
1306301		ladnoooo	Toll (BOI17_toll)	C++20	100 / 100	2173 ms	4632 KiB

toll

#include <bits/stdc++.h>
using namespace std;

#define pb push_back
//#define int long long

const int maxN = 4e5 + 7;

vector<pair<int, int>> g[maxN];

int dp[maxN];

void solve() {
    int k, n, m, o;
    cin >> k >> n >> m >> o;

    for(int i = 1; i <= m; i++) {
        int u, v, w;
        cin >> u >> v >> w;
        g[v].pb({u, w});
    }

    while(o--) {
        int a, b;
        cin >> a >> b;
        int pa = a, ob = b;
        for(int i = a; i <= b; i++) dp[i] = 1e9;
        dp[a] = 0;
        a /= k;
        b /= k;
        for (int i = a + 1; i <= b; i++) {
            int l = i * k;
            int r = min(n - 1, l + k - 1);

            for (int v = l; v <= r; v++) {
                for (auto [u, w] : g[v]) {
                    if (u >= pa && u <= ob && dp[u] != 1e9) {
                        dp[v] = min(dp[v], dp[u] + w);
                    }
                }
            }
        }
        
        if(dp[ob] == 1e9) cout << -1 << '\n';
        else cout << dp[ob] << '\n';
    }
}

signed main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    //freopen("input.txt", "r", stdin);
    int t = 1;
    //cin >> t;
    while(t--) solve();
}

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