Nu aveti permisiuni pentru a descarca fisierul grader_test2.in
Cod sursa(job #2729895)
| Utilizator | Data | 25 martie 2021 15:54:25 | |
|---|---|---|---|
| Problema | Algoritmul lui Dijkstra | Scor | 100 |
| Compilator | cpp-64 | Status | done |
| Runda | Arhiva educationala | Marime | 1.14 kb |
#include <fstream>
#include <vector>
#include <queue>
#include <bitset>
using namespace std;
const int N = 5e4 + 1;
const int INF = 1e9 + 15;
vector <pair <int, int>> a[N];
priority_queue <pair <int, int>> pq;
bitset <N> prelucrat;
int d[N], n, m;
int main()
{
ifstream in("dijkstra.in");
ofstream out("dijkstra.out");
in >> n >> m;
for (int i = 0; i < m; i++)
{
int x, y, c;
in >> x >> y >> c;
a[x].push_back({y, c});
}
in.close();
for (int i = 2; i <= n; i++) d[i] = INF;
d[1] = 0;
pq.push({0, 1});
while (!pq.empty())
{
int x = pq.top().second;
pq.pop();
if (prelucrat[x]) continue;
prelucrat[x] = 1;
for (auto p: a[x])//parcurg succesorii lui x
{
int y = p.first, c = p.second;
if (d[x] + c < d[y])
{
d[y] = d[x] + c;
pq.push({-d[y], y});
}
}
}
for (int i = 2; i <= n; i++)
{
if (d[i] == INF) d[i] = 0;
out << d[i] << " ";
}
out.close();
return 0;
}
