Created
July 22, 2019 15:11
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#include <queue> | |
#include <vector> | |
#include <iostream> | |
using namespace std; | |
vector<int> mat[3001]; | |
int check[3001]; | |
int dist[3001]; | |
int go(int x, int p) { | |
if (check[x]) { // 부모정보 반환 | |
return x; | |
} | |
check[x] = 1; | |
for (int k = 0; k < mat[x].size(); k++) { | |
int y = mat[x][k]; | |
if (y == p) continue; // 서로 지목하는 경우에 대해서는 배제 | |
int ret = go(y, x); | |
if (ret == -2) return -2; // 사이클이 포함되어 있지 않은 노드라면 | |
if (ret >= 0) { | |
check[x] = 2; // 사이클 | |
if (ret == x) return -2; // 시작점 | |
else return ret; // 사이클이면서 시작점이 아닐 때 | |
} | |
} | |
return -1; // 리프 노드일 | |
} | |
int main(void) { | |
ios_base::sync_with_stdio(false); | |
cin.tie(nullptr); | |
int n; | |
cin >> n; | |
for (int i = 0; i < n; i++) { | |
int x, y; | |
cin >> x >> y; | |
mat[x].push_back(y); | |
mat[y].push_back(x); | |
} | |
go(1, -1); | |
queue<int> q; | |
for (int i = 1; i <= n; i++) { | |
if (check[i] == 2) { | |
dist[i] = 0; | |
q.push(i); | |
} | |
} | |
while (!q.empty()) { | |
int x = q.front(); | |
q.pop(); | |
for (int i = 0; i < mat[x].size(); i++) { | |
int y = mat[x][i]; | |
if (check[y] == 2) continue; | |
check[y] = 2; | |
dist[y] = dist[x] + 1; | |
q.push(y); | |
} | |
} | |
for (int i = 1; i <= n; i++) { | |
cout << dist[i] << ' '; | |
} | |
cout << '\n'; | |
return 0; | |
} |
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