Pagini recente » Cod sursa (job #1475971) | Cod sursa (job #268385) | Cod sursa (job #2562975) | Cod sursa (job #1234167) | Cod sursa (job #2275492)
#include <bits/stdc++.h>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
int mini[50001];
vector <pair <int,int > > v[50005];
priority_queue <pair <int,int> ,vector <pair <int,int> > ,greater <pair <int,int> > > h;
int n,m,i,x,y,cost,sel[50005],nr,c,j;
int main()
{
f>>n>>m;
for (i=1;i<=m;i++)
{
f>>x>>y>>cost;
v[x].push_back({y,cost});
}
for (i=2;i<=n;i++)
{
mini[i]=-1;
}
mini[1]=0;
sel[1]=1;
for (i=0;i<v[1].size();i++)
{
h.push({v[1][i].second,v[1][i].first});
mini[v[1][i].first]=v[1][i].second;
}
nr=v[1].size();
while (nr!=0)
{
while (sel[h.top().second]==1)
{
h.pop();
}
c=h.top().second;
sel[c]=1;
h.pop();
nr--;
for (i=0;i<v[c].size();i++)
{
j=v[c][i].first;
if (mini[j]==-1)
{
nr++;
mini[j]=mini[c]+v[c][i].second;
h.push({mini[j],v[c][i].first});
}
else
if (mini[j]>mini[c]+v[c][i].second)
{
mini[j]=mini[c]+v[c][i].second;
h.push({mini[j],j});
}
}
}
for (i=2;i<=n;i++)
{
if (mini[i]==-1)
{
g<<"0"<<" ";
}
else
{
g<<mini[i]<<" ";
}
}
return 0;
}