Pagini recente » Cod sursa (job #985576) | Cod sursa (job #2112481) | Cod sursa (job #1357545) | Cod sursa (job #1512744) | Cod sursa (job #1414978)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#include <math.h>
#define NMAX 50005
#define MMAX 250005
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
vector <pair<int,int> > G[NMAX];
priority_queue <pair<int,int> > pq;
int n,m, sol[NMAX];
bool viz[NMAX];
void dijkstra(int nod)
{
if(pq.empty()==0)//cat timp coada nu e goala
{
for(int i=0;i<G[nod].size();i++)
{
int cost=sol[nod]+G[nod][i].second; //costul unui nod=costul tatalui + costul muchiei dintre ei
if(sol[G[nod][i].first]>cost)// daca e mai mic ca ce era inainte inregistrat, modificam in solutii si adaugam in coada
{
sol[G[nod][i].first]=cost;
viz[G[nod][i].first]=1;
pq.push(make_pair(-cost,G[nod][i].first));
}
}
nod=pq.top().second;
pq.pop(); //scot din coada de prioritati nodul de cost minim
dijkstra(nod); //parcurg din nou graful pt nodul cu cost minim
}
}
int main()
{
int i,x,y,cost;
f>>n>>m;
for(i=1;i<=m;i++)
{
f>>x>>y>>cost;
G[x].push_back(make_pair(y,cost));
}
for(i=1;i<=n;i++)
if(i==1)
sol[i]=0;
else sol[i]=1<<30;
pq.push(make_pair(0,1));
dijkstra(1);
for(i=2;i<=n;i++)
if(viz[i]==0)
sol[i]=0;
for(i=2;i<=n;i++)
g<<sol[i]<<' ';
return 0;
}