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Cod sursa(job #677484)
#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string>
#include <vector>
#include <queue>
using namespace std;
#define maxN 100005
#define PB push_back
int cost[maxN], N;
bool cont[maxN];
vector <int> list[maxN];
queue <int> Q;
void bfs (int nod)
{
for (int i = 0; i <= N; ++ i) cost[i] = - 1;
cost[nod] = 0;
Q.push (nod);
cont[nod] = true;
while (! Q.empty ())
{
int node = Q.front();
Q.pop();
for (unsigned int i = 0; i < list[node].size(); ++ i)
{
int node2 = list[node][i];
if (cont[node2]) continue;
cost[node2] = cost[node] + 1;
cont[node2] = true;
Q.push (node2);
}
}
}
int main()
{
freopen ("bfs.in", "r", stdin);
freopen ("bfs.out", "w", stdout);
int M, S;
scanf ("%d %d %d", &N, &M, &S);
while (M --)
{
int a, b;
scanf ("%d %d", &a, &b);
list[a].PB (b);
}
bfs (S);
for (int i = 1; i <= N; ++ i) printf ("%d ", cost[i]);
return 0;
}