Pagini recente » Cod sursa (job #1398860) | Cod sursa (job #567334) | Cod sursa (job #2067817) | Cod sursa (job #1220585) | Cod sursa (job #2712144)
#include <iostream>
#include <fstream>
#include <vector>
#include <bitset>
#include <queue>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
const int nMax = 50005;
const int inf = (1 << 30);
struct Node
{
int next, w;
};
int n, m;
int dist[nMax];
vector < Node > l[nMax];
bitset < nMax > viz;
struct comp
{
bool operator() (int a, int b)
{
return (dist[a] > dist[b]);
}
};
priority_queue < int, vector < int >, comp > q;
void Dijkstra (int node)
{
for (int i = 2; i <= n; i++)
{
dist[i] = inf;
}
q.push(node);
viz[node] = 1;
while (!q.empty())
{
node = q.top();
q.pop();
viz[node] = 0;
for (Node nextNode : l[node])
{
if (dist[nextNode.next] > dist[node] + nextNode.w)
{
dist[nextNode.next] = dist[node] + nextNode.w;
if (!viz[nextNode.next])
{
viz[nextNode.next] = 1;
q.push(nextNode.next);
}
}
}
}
}
int main()
{
fin >> n >> m;
for (int i = 1; i <= m; i++)
{
int a, b, w;
fin >> a >> b >> w;
l[a].push_back({b, w});
}
Dijkstra(1);
for (int i = 2; i <= n; i++)
{
if (dist[i] == inf)
{
dist[i] = 0;
}
fout << dist[i] << ' ';
}
fin.close();
fout.close();
return 0;
}