Submission #682630

#	Time	Username	Problem	Language	Result	Execution time	Memory
682630		anonimy	Ferries (NOI13_ferries)	C++14	40 / 40	262 ms	22492 KiB

ferries

#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <functional>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

vector<vector<ll>> G;
vector<priority_queue<ll>> edges;
vector<ll> dist;
ll n;

void dijkstra(ll s)
{
	vector<bool> visited(n + 1, false);
	dist.resize(n + 1, 1e18);
	priority_queue<pll, vector<pll>, greater<pll>> pq;

	dist[s] = 0;
	pq.push({ 0, s });

	while (!pq.empty())
	{
		ll v = pq.top().second;
		pq.pop();

		if (visited[v]) continue;
		visited[v] = true;

		for (ll i = 0; i < G[v].size(); i++)
		{
			ll u = G[v][i], w = edges[u].top();
			edges[u].pop();

			if (dist[v] + w < dist[u])
			{
				dist[u] = dist[v] + w;
				pq.push({ dist[u], u });
			}
		}
	}

}

int main()
{
	ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

	ll m;
	cin >> n >> m;

	G.resize(n + 1);
	edges.resize(n + 1);
	for (ll i = 0; i < m; i++)
	{
		ll a, b, c;
		cin >> a >> b >> c;

		G[b].push_back(a);
		edges[a].push(c);
	}

	dijkstra(n);

	cout << dist[1];
}

Compilation message (stderr)

ferries.cpp: In function 'void dijkstra(ll)':
ferries.cpp:34:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |   for (ll i = 0; i < G[v].size(); i++)
      |                  ~~^~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12