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Cod sursa(job #462284)
#include<stdio.h>
#include<string.h>
using namespace std;
#define dim 10010
int n,m,S,x,y,i,A[100010][1001],C[dim*dim],B[dim];
void citire()
{ FILE *f=fopen("bfs.in","r");
fscanf(f,"%d %d %d",&n,&m,&S);
for(i=1;i<=m;i++)
{
fscanf(f,"%d %d",&x,&y);
A[x][0]++;
A[x][ A[x][0] ]=y;
}
fclose(f);
}
void BFS(int x)
{
int i,in,sf,k;
memset(B,-1,sizeof(B));
B[x]=0;
C[0]=x; in=sf=0;
k=0;
while(in<=sf)
{
x=C[in++];
for(i=1;i<=A[x][0];i++)
if(B[A[x][i]]==-1)
{
B[ A[x][i] ]=B[x]+1;
C[++sf]=A[x][i];
}
}
}
void afisare()
{
FILE *g=fopen("bfs.out","w");
for(i=1;i<=n;i++)
fprintf(g,"%d ",B[i]);
fprintf(g,"\n");
fclose(g);
}
int main()
{
citire();
BFS(S);
afisare();
return 0;
}