Mai intai trebuie sa te autentifici.
Cod sursa(job #2270846)
Utilizator | Data | 27 octombrie 2018 17:31:42 | |
---|---|---|---|
Problema | BFS - Parcurgere in latime | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.76 kb |
#include <bits/stdc++.h>
#define maxn 100010
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector <int> A[maxn];
int N, M, L, Start;
int G[maxn], S[maxn], Cost[maxn];
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;
fin >> N >> M >> Start;
for (i = 1; i <= M; i++)
{
fin >> x >> y;
A[x].push_back(y);
}
for (i = 1; i <= N; i++)
G[i] = A[i].size();
BFS(Start);
for (i = 1; i <= N; i++)
fout << Cost[i] << " ";
fout << "\n";
return 0;
}