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Cod sursa(job #563420)
#include<stdio.h>
#include<queue>
#include<vector>
using namespace std;
const int N=250000;
const int INF=307500000;
struct succesor
{
int vf,cost;
};
vector<succesor> a[N];
priority_queue< pair<int,int> >h;
int n,x0,d[N],pred[N];
bool s[N];
void eu_ma_chinui_sa_citesc()
{
int m,i,x,y,c;
scanf("%d%d",&n,&m);
x0 = 1;
for(i=1;i<=n;i++)
{
scanf("%d%d%d",&x,&y,&c);
a[x].push_back((succesor){y,c});
}
}
int vf_cost_minim()
{
int x;
while(!h.empty())
{
x=h.top().second;
h.pop();
if(!s[x])
return x;
}
return 0;
}
void eu_actualizez(int x)
{
int y,c,i;
for(i=0;i<a[x0].size();i++)
{
y=a[x0][i].vf;
c=a[x0][i].cost;
if(d[x0]+c < d[y])
{
d[y] = d[x0] + c;
pred[y] = x0;
h.push(make_pair(-d[y],y));
}
}
}
void init()
{
int i;
for(i=0;i<N;i++)
d[i] = INF;
}
void eu_il_implementez_pe_djikistra_asta()
{
int x,i;
init();
d[x0]=0;
for(i=1;i<n;i++)
{
x = vf_cost_minim();
if(d[x] == INF)
return ;
s[x] = true;
eu_actualizez(x);
}
}
void eu_afisez_cu_multe_dificultati()
{
int i;
for(i=1;i<=n;i++)
printf("%d ", d[i]);
}
int main()
{
freopen("dijkstra.in","r",stdin);
freopen("dijkstra.out","w",stdout);
eu_ma_chinui_sa_citesc();
eu_il_implementez_pe_djikistra_asta();
eu_afisez_cu_multe_dificultati();
return 0;
}