Submission #714772

#	Time	Username	Problem	Language	Result	Execution time	Memory
714772		KING	Toll (BOI17_toll)	C++14	0 / 100	102 ms	7380 KiB

toll

#include<bits/stdc++.h>
#define NOT_STONKS ios::sync_with_stdio(false), cin.tie(0), cout.tie(0)

using namespace std;
const int maxn = 2e5 + 10; //4e6 + 10; //3e5 + 10;
const int mod = 1e9 + 7; //998244353;
typedef long long ll;

int k, n, m, o, arr[maxn], root[maxn];
ll psum[maxn];
vector< pair<int, int> > G[maxn];
bool marked[maxn];

void dfs(int v) {
    marked[v] = true;
    if (!G[v].empty()) {
        root[G[v].back().first] = root[v];
        dfs(G[v].back().first);
    }
}

int main() {
    NOT_STONKS;

    cin >> k >> n >> m >> o;
    for (int i = 0; i < m; i++) {
        int u, v, w;
        cin >> u >> v >> w;
        G[u].push_back({ v, w });
        arr[v] = w;
    }
    for (int i = 1; i <= n; i++) if (!marked[i]) {
        root[i] = i;
        dfs(i);
    }
    for (int i = 1; i <= n; i++) psum[i] = psum[i - 1] + arr[i];
    while (o--) {
        int a, b;
        cin >> a >> b;
        if (root[a] != root[b]) {
            cout << -1 << endl;
            continue;
        }
        cout << psum[b] - psum[a] << endl;
    }
    return 0;
}

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