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Cod sursa(job #445811)
#include <stdlib.h>
#include <cstdio>
#include <vector>
using namespace std;
#define maxn 100010
vector<int>a[maxn];
int g[maxn],s[maxn],cost[maxn];
int n,m,st,l;
void bfs(int nod)
{
int i,j;
memset(cost, - 1, sizeof(cost));
l = 1;
cost[nod] = 0;
s[l] = nod;
for (i = 1; i <= l; i++)
for (j = 0; j < g[s[i]]; j++)
if (cost[a[s[i]][j]] == -1)
{
s[++l] = a[s[i]][j];
cost[s[l]] = cost[s[i]] + 1;
}
}
int main()
{
int i,x,y;
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d%d%d",&n,&m,&st);
for (i = 1; i <= m; i++)
{
scanf("%d%d",&x,&y);
a[x].push_back(y);
}
for (i = 1; i <= n; i++)
g[i] = a[i].size();
bfs(st);
for (i = 1; i <= n; i++)
printf("%d ",cost[i]);
printf("\n");
return 0;
}