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Cod sursa(job #585261)
//#include "stdafx.h"
#include <vector>
#include <queue>
#include <stdio.h>
using namespace std;
#define maxn 100333
int n, m, S;
vector<int> v[maxn];
int dist[maxn];
void bfs(int source)
{
int i, nod;
queue<int> q;
q.push(source);
for (i=1; i<=n; i++)
dist[i] = -1;
dist[source] = 0;
for (; !q.empty(); q.pop())
{
//printf("%d\n", q.front());
for (nod = q.front(), i = 0; i < v[nod].size(); i++)
if (dist[v[nod][i]] == -1)
{
dist[v[nod][i]] = dist[nod] + 1;
q.push(v[nod][i]);
//printf("%d %d\n", nod, v[nod][i]);
}
}
}
int main()
{
int i, j, x, y;
FILE *fin = fopen("bfs.in", "rt"), *fout = fopen("bfs.out", "wt");
fscanf(fin, "%d %d %d", &n, &m, &S);
for (i=0; i<m; i++)
{
fscanf(fin, "%d %d", &x, &y);
v[x].push_back(y);
}
bfs(S);
for (i=1; i<=n; i++)
fprintf(fout, "%d ", dist[i]);
fclose(fin), fclose(fout);
return 0;
}