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Cod sursa(job #677669)
//dijkstra cu priority queue
#include<cstdio>
#include<iostream>
#include<algorithm>
#include<set>
#include<queue>
#include<cstring>
#include<vector>
using namespace std;
struct muchie
{
int vec,cost;
};
vector <muchie> G[50000+10];
int viz[50000+10],d[50000+10];
bool cmp(const pair<int,int> &a, const pair<int,int> &b)
{
if(a.first == b.first)
return a.second<b.second;
return a.first<b.first;
}
inline void dijkstra()
{
memset(d,0x3f,sizeof(d));
priority_queue < pair<int,int>, vector<pair<int,int> >, greater<pair<int,int> > > Q;
d[1]=0;
Q.push(make_pair(0,1));
while(!Q.empty())
{
int nod=Q.top().second,cost=Q.top().first;
Q.pop();
for(vector<muchie>::iterator it=G[nod].begin(),stop=G[nod].end();it<stop;++it)
{
if( d[it->vec] > cost + it->cost )
{
d[it->vec] = cost + it->cost;
Q.push( make_pair( d[it->vec], it->vec ) );
}
}
}
}
int main()
{
freopen("dijkstra.in","rt",stdin);
freopen("dijkstra.out","wt",stdout);
int n,m;
cin>>n>>m;
for(int i=1;i<=m;++i)
{
int from,to,cost;
cin>>from>>to>>cost;
G[from].push_back((muchie){to,cost});
}
dijkstra();
for(int i=2;i<=n;++i)
cout<<((d[i]==0x3f3f3f3f)?0:d[i])<<' ';
putchar('\n');
return 0;
}