Pagini recente » Cod sursa (job #1522776) | Cod sursa (job #2242142) | Cod sursa (job #903142) | Cod sursa (job #800663) | Cod sursa (job #2663964)
#include <fstream>
#include <iostream>
#include <vector>
#include <iterator>
#include <queue>
std::vector <std::vector <int>> adj;
void read(int &n, int &node) {
std::ifstream f("bfs.in");
f >> n;
adj.resize(n);
int edges;
f >> edges;
f >> node;
for (int i = 0; i < edges; i++) {
int x, y;
f >> x >> y;
adj[x - 1].push_back(y - 1);
}
f.close();
}
void bf_search(int x, int n) {
std::queue <int> q;
std::vector <int> visited;
std::vector <int> distance;
visited.assign(n, 0);
distance.assign(n, -1);
visited[x] = 1;
distance[x] = 0;
q.push(x);
while (!q.empty()) {
for (std::vector<int>::iterator it = adj[q.front()].begin(); it != adj[q.front()].end(); it++) {
if (!visited[*it]) {
q.push(*it);
distance[*it] = distance[q.front()] + 1;
}
}
q.pop();
}
std::ofstream g("bfs.out");
for (int dist : distance) {
g << dist << " ";
}
g.close();
}
int main() {
int n, x;
read(n, x);
bf_search(x - 1, n);
return 0;
}