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Cod sursa(job #524392)
#include <iostream>
#include <cstdio>
#include <vector>
#include <queue>
#define NMAX 100010
using namespace std;
int N, M, S, i, a, b, d[NMAX];
vector<int> v[NMAX];
queue<int> q;
void in(void)
{
FILE *f = fopen("bfs.in", "r");
fscanf(f, "%d%d%d", &N, &M, &S);
for(i = 1; i <= M; ++i)
fscanf(f, "%d%d", &a, &b),
v[a].push_back(b);
fclose(f);
}
void BFS(void)
{
memset(d, -1, sizeof(d));
q.push(S);
d[S] = 0;
while(!q.empty())
{
int nod = q.front();
q.pop();
for(i = 0; i < v[nod].size(); ++i)
{
int adiacNod = v[nod][i];
if(d[adiacNod] == -1)
q.push(adiacNod),
d[adiacNod] = d[nod] + 1;
}
}
}
void out(void)
{
FILE *g = fopen("bfs.out", "w");
for(i = 1; i <= N; ++i)
fprintf(g, "%d ", d[i]);
fclose(g);
}
int main(void)
{
in();
BFS();
out();
return 0;
}