Mai intai trebuie sa te autentifici.
Cod sursa(job #2818700)
| Utilizator | Data | 16 decembrie 2021 18:46:54 | |
|---|---|---|---|
| Problema | Algoritmul lui Dijkstra | Scor | 100 |
| Compilator | cpp-64 | Status | done |
| Runda | Arhiva educationala | Marime | 1.35 kb |
#include <iostream>
#include <fstream>
#include <vector>
#include <bitset>
#include <queue>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
#define NMAX 50005
#define INF 1000000000
int n, m;
vector<pair<int, int>> G[NMAX];
int d[NMAX];
bitset<NMAX> viz;
priority_queue<pair<int, int>, vector<pair<int, int>>, greater<>> q;
void citire() {
f >> n >> m;
int nod1, nod2, cost;
for (int i = 0; i < m; i++) {
f >> nod1 >> nod2 >> cost;
G[nod1].push_back({cost, nod2});
}
}
void initializare()
{
for (int i = 1; i <= n; i++)
d[i] = INF;
}
void parcurgere()
{
d[1]=0;
int vf = 1;
q.push({0,1});
while (!q.empty())
{
vf = q.top().second;
q.pop();
if(viz[vf])
continue;
viz[vf] = true;
for (auto &nod:G[vf])
if (d[vf] + nod.first < d[nod.second])
{
d[nod.second] = d[vf] + nod.first;
q.push({d[nod.second], nod.second});
}
}
}
void afisare() {
for (int i = 2; i <= n; i++) {
if (d[i] == INF)
g << 0 << ' ';
else
g << d[i] << ' ';
}
}
int main() {
citire();
initializare();
parcurgere();
afisare();
return 0;
}
