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Cod sursa(job #1482191)
| Utilizator | Data | 6 septembrie 2015 17:54:48 | |
|---|---|---|---|
| Problema | BFS - Parcurgere in latime | Scor | 80 |
| Compilator | cpp | Status | done |
| Runda | Arhiva educationala | Marime | 0.97 kb |
#include <iostream>
#include <vector>
#include <queue>
#include <string.h>
using namespace std;
int n, m, s, a, b, distances[100005], curr, i, size;
bool visited[100005] = { false };
vector<vector<int>> graph;
queue<int> list;
int main()
{
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
scanf("%d%d%d", &n, &m, &s);
memset(distances, -1, (n + 1) * 4);
graph = vector<vector<int>>(n + 1);
for (; m > 0; --m) scanf("%d%d", &a, &b), graph.at(a).push_back(b);
list.push(s);
distances[s] = 0;
visited[s] = true;
while (!list.empty())
{
curr = list.front();
list.pop();
size = graph[curr].size();
for (i = 0; i < size; ++i)
{
int &adNodeDist = distances[graph[curr][i]];
int &currNodeDist = distances[curr];
if (adNodeDist == -1) adNodeDist = currNodeDist + 1;
if (!visited[graph[curr][i]]) list.push(graph[curr][i]);
}
visited[curr] = true;
}
for (i = 1; i <= n; ++i) printf("%d ", distances[i]);
}