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BOJ_25601.java
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BOJ_25601.java
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.StringTokenizer;
public class Main {
HashMap<String, ArrayList<String>> edges;
private boolean bf(String cur, String ed) {
if (cur.equals(ed)) {
return true;
}
if (edges.get(cur) == null)
return false;
for (String next : edges.get(cur)) {
if (bf(next, ed))
return true;
}
return false;
}
private void solution() throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int n = Integer.parseInt(br.readLine());
edges = new HashMap<>();
for (int i = 0; i < n-1; i++) {
StringTokenizer st = new StringTokenizer(br.readLine());
String a = st.nextToken();
String b = st.nextToken();
if (!edges.containsKey(a)) {
edges.put(a, new ArrayList<>());
}
edges.get(a).add(b);
}
StringTokenizer st = new StringTokenizer(br.readLine());
String a = st.nextToken();
String b = st.nextToken();
System.out.println(bf(a, b) || bf(b, a) ? 1 : 0);
}
public static void main(String[] args) throws Exception {
new Main().solution();
}
}