Submission #304911

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
304911	2020-09-22 07:42:12	model_code	Stations (IOI20_stations)	Java	100 / 100	1722 ms	45532 KiB

stations

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import java.util.ArrayList;
public class stations {
  private static final int MAXN = 1000;
  
  private int cnt;
  private ArrayList<Integer>[] adj;
  private int[] labels;
  
  private void dfs(int v, int p, int d) {
    if(d == 0) labels[v] = cnt++;
    for (Integer i : adj[v]) if (i != p) dfs(i, v, d ^ 1);
    if(d == 1) labels[v] = cnt++;
  }
  int[] label(int n, int k, int[] u, int[] v) {
    cnt = 0;
    adj = new ArrayList[n];
    for (int i = 0; i < n; i++) {
      adj[i] = new ArrayList<Integer>();
    }
    for (int i = 0; i < n - 1; i++) {
      adj[u[i]].add(v[i]);
      adj[v[i]].add(u[i]);
    }
    labels = new int[n];
    dfs(0, -1, 0);
    return labels;
  }
 
 
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Compilation message (stderr)

Note: stations.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 61 / 61