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Cod sursa(job #712347)
#include<fstream>
#include<limits>
using namespace std;
#define inf 250000000
long long n,d[50001],m;
struct graf {
int x,y,z;
};
graf arc[250001];
int dist(int a, int b) {
int k=-1;
for(int i=1;i<=m;i++)
if(arc[i].x==a && arc[i].y==b) {
k=arc[i].z;
i=m+1;
}
return k;
}
void dijkstra(int x0) {
int i,min,k,ok=1,viz[50001],tata[50001],p;
for(i=1;i<=n;i++) {
p=dist(x0,i);
if(p==-1) d[i]=inf;
else d[i]=p;
tata[i]=x0;
viz[i]=0;
}
tata[x0]=0;
viz[x0]=1;
while(ok) {
min=inf;
for(i=1;i<=n;i++)
if(!viz[i] && min>d[i]) {
min=d[i];
k=i;
}
if(min!=inf) {
viz[k]=i;
for(i=1;i<=n;i++) {
p=dist(k,i);
if(p==-1) p=inf;
if(!viz[i] && d[i]>d[k]+p) {
d[i]=d[k]+p;
tata[i]=k;
}
}
}
else ok=0;
}
}
int main() {
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
int i,x0;
f>>n>>m;
x0=1;
for(i=1;i<=m;i++)
f>>arc[i].x>>arc[i].y>>arc[i].z;
dijkstra(x0);
for(i=2;i<=n;i++)
if(d[i]!=inf) g<<d[i]<<" ";
else g<<0<<" ";
return 0;
}