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Cod sursa(job #361293)
#include <iostream>
#include <vector>
#include <fstream>
#define MAXN 100010
using namespace std;
vector<int> A[MAXN];
int Cost[MAXN],C[MAXN];
int N,M,S;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int BFS(int x) {
int prim,ultim,i;
memset(Cost,-1,sizeof(Cost));
Cost[x] = 0;
prim = ultim = 0;
C[0] = x;
while (prim <= ultim) {
x = C[prim++];
for (i=1;i<=A[x][0];++i) {
if (Cost[A[x][i]] == -1) {
Cost[A[x][i]] = Cost[x] + 1;
C[++ultim] = A[x][i];
}
}
}
}
int main() {
int x,y,i;
fin >> N >> M >> S;
for (i=1;i<=N;++i) {
A[i].push_back(0);
}
for (i=1;i<=M;++i) {
fin >> x >> y;
A[x].push_back(y);
}
for (i=1;i<=N;++i) {
A[i][0] = A[i].size() - 1;
}
BFS(S);
for (i=1;i<=N;++i)
fout << Cost[i] << " ";
fout << endl;
fin.close();
fout.close();
return 0;
}