Mai intai trebuie sa te autentifici.
Cod sursa(job #2418138)
| Utilizator | Data | 3 mai 2019 19:45:46 | |
|---|---|---|---|
| Problema | Algoritmul lui Dijkstra | Scor | 100 |
| Compilator | cpp-64 | Status | done |
| Runda | Arhiva educationala | Marime | 1.17 kb |
#include <bits/stdc++.h>
#define NM 50005
using namespace std;
ifstream fin ("dijkstra.in");
ofstream fout ("dijkstra.out");
void read();
void dijkstra();
bitset<NM> viz;
vector<pair<int,int>> v[NM];
priority_queue<pair<int,int>, vector<pair<int,int>>, greater<pair<int,int>>> q;
int n, m, d[NM];
int main()
{
read();
dijkstra();
return 0;
}
void dijkstra()
{
for(int i=1; i<=n; i++)
d[i] = INT_MAX;
d[1] = 0;
q.push({0, 1});
while(!q.empty())
{
int nod = q.top().second;
q.pop();
if(!viz[nod])
{
for(auto it : v[nod])
if(!viz[it.first] && d[nod]+it.second < d[it.first])
{
d[it.first] = d[nod]+it.second;
q.push({d[it.first], it.first});
}
viz[nod] = 1;
}
}
for(int i=2; i<=n; i++)
if(d[i] == INT_MAX)
fout << 0 << ' ';
else
fout << d[i] << ' ';
}
void read()
{
int x, y, c;
fin >> n >> m;
for(int q=1; q<=m; ++q)
{
fin >> x >> y >> c;
v[x].push_back({y, c});
}
}
