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Cod sursa(job #456941)
#include<cstdio>
#include<vector>
#include<queue>
#define N 50002
using namespace std;
vector <int> a[N],cost[N];
priority_queue <pair<int,int>, vector<pair<int,int> >, greater<pair<int,int> > > h;
int d[N],pred[N],inf=1<<30,m,n;
void citire();
void afis(int);
void dijkstra(int);
bool s[N];
void extinde(int,int);
int main()
{
freopen("dijkstra.in","r",stdin);
freopen("dijkstra.out","w",stdout);
citire();
dijkstra(1);
for(int i=2 ; i<=n ; ++i)
if(d[i]!=inf)
printf("%d ",d[i]);
else
printf("0 ");
printf("\n");
//afis(n);
return 0;
}
void citire()
{
int x,y,c;
scanf("%d%d ", &n,&m);
while(m--)
{
scanf("%d%d%d", &x,&y,&c);
a[x].push_back(y);
cost[x].push_back(c);
}
}
void dijkstra(int x)
{
int i,c;
for(i=1;i<=n;++i)
d[i]=inf;
d[x]=0;
//s[x]=true;
h.push(make_pair(0,x));
while(!h.empty())
{
x=h.top().second;
c=h.top().first;
h.pop();
if(s[x])
continue;
s[x]=true;
extinde(x,c);
}
}
void extinde(int x,int c)
{
int y,c1;
size_t g=a[x].size();
for(size_t i=0;i<g;++i)
{
y=a[x][i];
c1=cost[x][i];
if(c+c1<d[y])
{
d[y]=c+c1 ;
h.push(make_pair(d[y],y));
pred[y]=x;
}
}
}
void afis(int x)
{
int y;
if(x==0)
return;
y=pred[x];
afis(y);
printf("%d ", x);
}