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Cod sursa(job #520787)
#include <iostream>
#include<fstream>
#include <queue>
#define nmax 50002
#define oo 0x3f3f3f3f
using namespace std;
queue <int> Q;
int n,m;
int viz[nmax];
struct nod{
int inf,cost;
nod *urm;
};
nod *g[nmax];
struct vec{
int dist;
};
vec v[nmax];
void add(int x,int y,int z)
{
nod *aux = new nod;
aux->inf = y;
aux->cost = z;
aux->urm = g[x];
g[x] = aux;
}
int main()
{
ifstream f("dijkstra.in");
ofstream gg("dijkstra.out");
f>>n>>m;
int x,y,z;
for(int i=1;i<=m;i++)
{
f>>x>>y>>z;
add(x,y,z);
}
v[1].dist = 0;
Q.push(1);
viz[1] = 1;
for(int i=2;i<=n;i++)
v[i].dist = oo;
while(! Q.empty()){
int nd = Q.front();
Q.pop();
viz[nd]=0;
for(nod *p=g[nd];p;p=p->urm)
{
int t=p->inf;
if(v[nd].dist + p->cost < v[t].dist)
{
v[t].dist = p->cost + v[nd].dist;
if(viz[t] == 0)
{
Q.push(t);
viz[t]=1;
}
}
}
}
for(int i=2;i<=n;i++)
if(v[i].dist == oo)
gg<<0<<" ";
else
gg<<v[i].dist<< " ";
return 0;
}