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Cod sursa(job #917471)
#include<cstdio>
#include<queue>
#include<vector>
#include<cstring>
#include<utility>
#include<bitset>
#define INF 1<<30
#define NMAX 50005
#define TYPE pair<int,int>
FILE *f=fopen("dijkstra.in","r");
FILE *g=fopen("dijkstra.out","w");
using namespace std;
vector<pair <int,int> >G[NMAX];
vector<int>::iterator it;
int n,m,dist[NMAX];
priority_queue<TYPE,vector<TYPE>,greater<TYPE> > HEAP;
bool used[NMAX];
void read( void )
{
fscanf(f,"%d%d",&n,&m);
for(int i(1); i <=n ; ++i )
{
int a,b,c;
fscanf(f,"%d%d%d",&a,&b,&c);
G[a].push_back(make_pair(b,c));
}
fclose(f);
}
void solve( void )
{
for(int i(1); i<=n ; dist[i++]=INF)
dist[1]=0;
HEAP.push(make_pair(0,1));
while(!HEAP.empty())
{
int node=HEAP.top().second;
HEAP.pop();
if(used[node] ==true)
continue;
else
used[node]=true;
for(int i(0); i <G[node].size(); ++i )
{
int newnode=G[node][i].first;
int dis=G[node][i].second;
if( dist[newnode] > dist[node]+dis)
{
dist[newnode]=dist[node]+dis;
HEAP.push(make_pair(dist[newnode],newnode));
}
}
}
}
void write( void )
{
for(int i(2); i <=n; ++i )
if(dist[i]!=INF)
fprintf(g,"%d ",dist[i]);
else
fprintf(g,"0");
fclose(g);
}
int main( void )
{
read();
solve();
write();
return 0;
}