oj.uz

Submission #959103

# Submission time Handle Problem Language Result Execution time Memory
959103 2024-04-07T13:34:50 Z liaochengle Commuter Pass (JOI18_commuter_pass) C++14
0 / 100
 447 ms 30180 KB 
#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

vector<pair<ll, ll>> graph[100001];
ll du[100001], dv[100001], ds[100001], dp[2][100001], ans;
bool visited[100001];

void dijkstra1(ll start, ll arr[]) {
	fill(visited, visited + 100001, false);

	priority_queue<pair<ll, ll>> pq;
	pq.push({0, start});
	while (!pq.empty()) {
		ll c, node;
		tie(c, node) = pq.top();
		pq.pop();

		if (!visited[node]) {
			arr[node] = -c;
			visited[node] = true;
			for (auto &i : graph[node]) pq.push({c - i.second, i.first});
		}
	}
}

void dijkstra2(ll start, ll end) {
	fill(dp[0], dp[0] + 100001, LLONG_MAX / 2);
	fill(dp[1], dp[1] + 100001, LLONG_MAX / 2);
	fill(visited, visited + 100001, false);

	priority_queue<pair<ll, pair<ll, ll>>> pq;
	pq.push({0, {start, 0}});
	dp[0][0] = dp[1][0] = LLONG_MAX / 2;
	while (!pq.empty()) {
		ll c, node, par;
		pair<ll, ll> p;
		tie(c, p) = pq.top();
		tie(node, par) = p;
		pq.pop();

		if (!visited[node]) {
			visited[node] = true;
			ds[node] = -c;
			dp[0][node] = min(du[node], dp[0][par]);
			dp[1][node] = min(dv[node], dp[1][par]);
			for (auto i : graph[node]) pq.push({c - i.second, {i.first, node}});
		} else {
			if (min(du[node], dp[0][par]) + min(dv[node], dp[1][par]) <=
			    dp[0][node] + dp[1][node]) {
				dp[0][node] = min(du[node], dp[0][par]);
				dp[1][node] = min(dv[node], dp[1][par]);
			}
		}
	}

	ans = min(ans, dp[0][end] + dp[1][end]);
}

int main() {
	iostream::sync_with_stdio(false);
	cin.tie(0);
	ll n, m, s, t, u, v;
	cin >> n >> m >> s >> t >> u >> v;
	for (int i = 0; i < m; i++) {
		ll a, b, c;
		cin >> a >> b >> c;
		graph[a].push_back({b, c});
		graph[b].push_back({a, c});
	}

	dijkstra1(u, du);
	dijkstra1(v, dv);

	ans = du[v];

	dijkstra2(s, t);
	dijkstra2(t, s);

	cout << ans << '\n';
	return 0;
}

Subtask #1
0 / 16.0

# Verdict Execution time Memory Grader output
1 Incorrect 447 ms 30180 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 397 ms 29496 KB Output is correct
2 Incorrect 376 ms 25116 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 9952 KB Output is correct
2 Incorrect 2 ms 6748 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 45.0

# Verdict Execution time Memory Grader output
1 Incorrect 447 ms 30180 KB Output isn't correct
2 Halted 0 ms 0 KB -