Pagini recente » Cod sursa (job #2337211) | Cod sursa (job #1873969) | Cod sursa (job #135951) | Cod sursa (job #244312) | Cod sursa (job #1547664)
#include <fstream>
#include <iostream>
#include <queue>
#include <utility>
#define pp pair<int,int>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
const int MaxN = 50001;
const int INF = 1 << 30;
vector < pair < int , int > > G[MaxN];// pair.first este nodu pair.second este costul pana la nod
int d[MaxN],n,m;//distante
bool inQ[MaxN];
int main()
{
int x,y,c;
f >> n >> m;
for(int i = 1; i <= m; ++i)
{
f >> x >> y >> c;
G[x].push_back(make_pair(y,c));
// G[y].push_back(make_pair(x,c));
}
int source = 1;
inQ[source] = true;
priority_queue < int, vector < int > ,greater< int > > pq; //primu parametru tipu de date; al doilea structura pe care se face pq - ul; al 3 - lea pastrea prop de MIN heap
for(int i = 2;i <= n; i++) d[i] = INF;// setez distantele pana la INF
d[source] = 0;//distanta din sursa e 0
pq.push(source);// bag sursa si distana in heap
while(!pq.empty())//cat mai e ceva in heap
{
int node = pq.top();//iau min-ul din heap adica nodu de la cre relaxex
pq.pop();//eimin min-ul
for(vector<pp>::iterator i = G[node].begin(); i != G[node].end(); ++i)//iteram prin toti vecinii
{
int newNode = i -> first;
int newDistNode = i -> second;
if(d[newNode] > d[node] + newDistNode)//daca putem relaxa
{
d[newNode] = d[node] + newDistNode;
pq.push(newNode);//bagam in coada
}
}
}
for(int i = 2; i <= n; ++i)
g << (d[i] < INF ? d[i] : 0) << " ";
return 0;
}