Nu aveti permisiuni pentru a descarca fisierul grader_test15.ok
Cod sursa(job #353347)
Utilizator | Popa Stefan PopaStefan | Data | 4 octombrie 2009 20:14:04 |
---|---|---|---|
Problema | Sate | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.8 kb |
#include<fstream.h>
ifstream fin("sate.in");
ofstream fout("sate.out");
int n,m,x,y,c[30001],d[30001];
struct lista
{int x,d;
};
lista a[30001][30001];
void parcurgere()
{int p,u,aux,i;
c[1]=x;
d[x]=0;
p=u=1;
while(p<=u)
{aux=c[p];
p++;
for(i=1;i<=a[aux][0].x;i++)
if(d[a[aux][i].x]==0)
{u++;
c[u]=a[aux][i].x;
if(a[aux][i].x>=aux) d[a[aux][i].x]=a[aux][i].d+d[aux];
else d[a[aux][i].x]=d[aux]-a[aux][i].d;
}
}
fout<<d[y];
}
int main()
{fin>>n>>m>>x>>y;
int xx,yy,dd;
for(int i=1;i<=m;i++)
{fin>>xx>>yy>>dd;
a[xx][0].x++;
a[xx][a[xx][0].x].x=yy;
a[xx][a[xx][0].x].d=dd;
a[yy][0].x++;
a[yy][a[yy][0].x].x=xx;
a[yy][a[yy][0].x].d=dd;
}
parcurgere();
fin.close();
fout.close();
return 0;
}