Submission #5500970
Source Code Expand
public class Main { private static void solve() { int n = ni(); int[] from = new int[n-1]; int[] to = new int[n-1]; for (int i = 0; i < n - 1; i ++) { from[i] = ni() - 1; to[i] = ni() - 1; } int[][] g = packU(n, from, to); ved1 = new int[n]; ved2 = new int[n]; q = new int[n]; int ret = dfs(0, new boolean[n], g); System.out.println(ret - 1); } private static int dfs(int now, boolean[] ved, int[][] g) { int[] dia = diameter(g, now, ved); ved[dia[3]] = true; int max = -1; for (int next : g[dia[3]]) { if (ved[next]) continue; max = Math.max(max, dfs(next, ved, g)); } return max + 1; } public static int[][] packU(int n, int[] from, int[] to){ return packU(n, from, to, from.length); } public static int[][] packU(int n, int[] from, int[] to, int sup) { int[][] g = new int[n][]; int[] p = new int[n]; for(int i = 0;i < sup;i++)p[from[i]]++; for(int i = 0;i < sup;i++)p[to[i]]++; for(int i = 0;i < n;i++)g[i] = new int[p[i]]; for(int i = 0;i < sup;i++){ g[from[i]][--p[from[i]]] = to[i]; g[to[i]][--p[to[i]]] = from[i]; } return g; } private static int[] ved1; private static int[] ved2; private static int cnt = 1; private static int[] q; public static int[] diameter(int[][] g, int v, boolean[] sved) { cnt ++; int f0 = -1, f1 = -1, d01 = -1, c = -1; { int qp = 0; q[qp++] = v; ved1[0] = cnt; for(int i = 0;i < qp;i++){ int cur = q[i]; for(int e : g[cur]){ if(ved1[e] != cnt && !sved[e]){ ved1[e] = cnt; q[qp++] = e; continue; } } } f0 = q[qp-1]; } { int qp = 0; q[qp++] = f0; ved2[f0] = cnt; for(int i = 0;i < qp;i++){ int cur = q[i]; for(int e : g[cur]){ if(ved2[e] != cnt && !sved[e]){ ved2[e] = cnt; q[qp++] = e; continue; } } } f1 = q[qp-1]; c = q[qp / 2]; } return new int[]{d01, f0, f1, c}; } public static void main(String[] args) { new Thread(null, new Runnable() { @Override public void run() { long start = System.currentTimeMillis(); String debug = args.length > 0 ? args[0] : null; if (debug != null) { try { is = java.nio.file.Files.newInputStream(java.nio.file.Paths.get(debug)); } catch (Exception e) { throw new RuntimeException(e); } } reader = new java.io.BufferedReader(new java.io.InputStreamReader(is), 32768); solve(); out.flush(); tr((System.currentTimeMillis() - start) + "ms"); } }, "", 64000000).start(); } private static java.io.InputStream is = System.in; private static java.io.PrintWriter out = new java.io.PrintWriter(System.out); private static java.util.StringTokenizer tokenizer = null; private static java.io.BufferedReader reader; public static String next() { while (tokenizer == null || !tokenizer.hasMoreTokens()) { try { tokenizer = new java.util.StringTokenizer(reader.readLine()); } catch (Exception e) { throw new RuntimeException(e); } } return tokenizer.nextToken(); } private static double nd() { return Double.parseDouble(next()); } private static long nl() { return Long.parseLong(next()); } private static int[] na(int n) { int[] a = new int[n]; for (int i = 0; i < n; i++) a[i] = ni(); return a; } private static char[] ns() { return next().toCharArray(); } private static long[] nal(int n) { long[] a = new long[n]; for (int i = 0; i < n; i++) a[i] = nl(); return a; } private static int[][] ntable(int n, int m) { int[][] table = new int[n][m]; for (int i = 0; i < n; i++) { for (int j = 0; j < m; j++) { table[i][j] = ni(); } } return table; } private static int[][] nlist(int n, int m) { int[][] table = new int[m][n]; for (int i = 0; i < n; i++) { for (int j = 0; j < m; j++) { table[j][i] = ni(); } } return table; } private static int ni() { return Integer.parseInt(next()); } private static void tr(Object... o) { if (is != System.in) System.out.println(java.util.Arrays.deepToString(o)); } }
Submission Info
Submission Time | |
---|---|
Task | D - Uninity |
User | hiromi_ayase |
Language | Java8 (OpenJDK 1.8.0) |
Score | 0 |
Code Size | 4882 Byte |
Status | WA |
Exec Time | 2109 ms |
Memory | 51908 KB |
Judge Result
Set Name | Sample | All | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 0 / 1400 | ||||||||
Status |
|
|
Set Name | Test Cases |
---|---|
Sample | s1.txt, s2.txt |
All | 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt, 28.txt, 29.txt, 30.txt, 31.txt, 32.txt, 33.txt, 34.txt, 35.txt, 36.txt, 37.txt, 38.txt, 39.txt, 40.txt, 41.txt, 42.txt, 43.txt, 44.txt, 45.txt, 46.txt, 47.txt, 48.txt, 49.txt, 50.txt, 51.txt, 52.txt, 53.txt, 54.txt, 55.txt, 56.txt, 57.txt, 58.txt, 59.txt, 60.txt, 61.txt, 62.txt, 63.txt, 64.txt, 65.txt, 66.txt, 67.txt, 68.txt, 69.txt, 70.txt, 71.txt, 72.txt, s1.txt, s2.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
01.txt | TLE | 2108 ms | 40944 KB |
02.txt | TLE | 2105 ms | 44272 KB |
03.txt | TLE | 2108 ms | 43184 KB |
04.txt | TLE | 2108 ms | 43896 KB |
05.txt | TLE | 2108 ms | 42580 KB |
06.txt | TLE | 2108 ms | 43904 KB |
07.txt | TLE | 2108 ms | 42452 KB |
08.txt | TLE | 2105 ms | 39796 KB |
09.txt | WA | 297 ms | 40300 KB |
10.txt | WA | 302 ms | 38648 KB |
11.txt | WA | 205 ms | 32968 KB |
12.txt | WA | 193 ms | 34052 KB |
13.txt | WA | 358 ms | 44532 KB |
14.txt | WA | 338 ms | 40316 KB |
15.txt | WA | 391 ms | 43488 KB |
16.txt | WA | 462 ms | 42076 KB |
17.txt | TLE | 2108 ms | 41340 KB |
18.txt | TLE | 2109 ms | 44276 KB |
19.txt | TLE | 2108 ms | 44272 KB |
20.txt | TLE | 2108 ms | 40712 KB |
21.txt | TLE | 2108 ms | 42088 KB |
22.txt | TLE | 2109 ms | 39356 KB |
23.txt | TLE | 2108 ms | 43872 KB |
24.txt | TLE | 2109 ms | 40384 KB |
25.txt | TLE | 2108 ms | 43116 KB |
26.txt | TLE | 2109 ms | 39836 KB |
27.txt | TLE | 2108 ms | 42708 KB |
28.txt | TLE | 2109 ms | 44156 KB |
29.txt | TLE | 2108 ms | 43132 KB |
30.txt | TLE | 2108 ms | 44752 KB |
31.txt | TLE | 2108 ms | 44784 KB |
32.txt | TLE | 2109 ms | 42224 KB |
33.txt | TLE | 2108 ms | 44556 KB |
34.txt | TLE | 2109 ms | 40824 KB |
35.txt | TLE | 2108 ms | 42864 KB |
36.txt | TLE | 2109 ms | 38400 KB |
37.txt | TLE | 2109 ms | 42028 KB |
38.txt | TLE | 2108 ms | 40392 KB |
39.txt | TLE | 2108 ms | 43888 KB |
40.txt | WA | 1941 ms | 49356 KB |
41.txt | WA | 1422 ms | 46956 KB |
42.txt | TLE | 2109 ms | 38776 KB |
43.txt | TLE | 2105 ms | 44716 KB |
44.txt | WA | 1856 ms | 51908 KB |
45.txt | TLE | 2105 ms | 49372 KB |
46.txt | WA | 1571 ms | 48060 KB |
47.txt | WA | 1970 ms | 49400 KB |
48.txt | WA | 1143 ms | 50344 KB |
49.txt | WA | 1468 ms | 47760 KB |
50.txt | WA | 1323 ms | 45180 KB |
51.txt | WA | 1406 ms | 47712 KB |
52.txt | WA | 1011 ms | 47680 KB |
53.txt | WA | 1199 ms | 46816 KB |
54.txt | WA | 1145 ms | 43704 KB |
55.txt | WA | 973 ms | 48136 KB |
56.txt | TLE | 2109 ms | 44320 KB |
57.txt | TLE | 2109 ms | 44036 KB |
58.txt | TLE | 2108 ms | 37704 KB |
59.txt | WA | 859 ms | 43092 KB |
60.txt | WA | 846 ms | 44328 KB |
61.txt | TLE | 2108 ms | 40648 KB |
62.txt | TLE | 2108 ms | 44400 KB |
63.txt | WA | 69 ms | 19924 KB |
64.txt | WA | 69 ms | 19284 KB |
65.txt | WA | 68 ms | 21136 KB |
66.txt | AC | 71 ms | 19280 KB |
67.txt | AC | 71 ms | 21204 KB |
68.txt | WA | 71 ms | 22868 KB |
69.txt | WA | 70 ms | 21332 KB |
70.txt | WA | 71 ms | 22740 KB |
71.txt | WA | 70 ms | 22484 KB |
72.txt | AC | 71 ms | 23380 KB |
s1.txt | AC | 69 ms | 19924 KB |
s2.txt | AC | 70 ms | 21264 KB |