Pagini recente » Cod sursa (job #2303168) | Cod sursa (job #897197) | Cod sursa (job #392561) | Cod sursa (job #3135430) | Cod sursa (job #3197482)
#include <iostream>
#include <vector>
#include <fstream>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
void bfs(int start, int n, int p, const vector<vector<int>>& graph, vector<int>& distances) {
vector<int> queue;
int front = 0, rear = 0;
queue.push_back(start);
distances[start] = 0;
while (front <= rear) {
int current = queue[front++];
for (int node : graph[current]) {
if (distances[node] == -1) {
distances[node] = distances[current] + 1;
queue.push_back(node);
++rear;
}
}
}
if (distances[p] == -1 && p != start) {
fout << "-1 ";
} else {
fout << distances[p] << " ";
}
}
int main() {
int m, n, p;
fin >> n >> m >> p;
vector<vector<int>> graph(n + 1);
int x, y;
for (int i = 1; i <= m; i++) {
fin >> y >> x;
graph[x].push_back(y);
}
for (int i = 1; i <= n; i++) {
vector<int> distances(n + 1, -1); // Initialize distances to -1
bfs(i, n, p, graph, distances);
}
return 0;
}