結果
問題 | No.1103 Directed Length Sum |
ユーザー | shojin_pro |
提出日時 | 2020-07-04 00:12:07 |
言語 | Java21 (openjdk 21) |
結果 |
AC
|
実行時間 | 961 ms / 3,000 ms |
コード長 | 3,086 bytes |
コンパイル時間 | 2,655 ms |
コンパイル使用メモリ | 78,672 KB |
実行使用メモリ | 86,964 KB |
最終ジャッジ日時 | 2023-10-17 06:36:28 |
合計ジャッジ時間 | 17,009 ms |
ジャッジサーバーID (参考情報) |
judge11 / judge12 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 55 ms
53,456 KB |
testcase_01 | AC | 55 ms
53,396 KB |
testcase_02 | AC | 660 ms
85,268 KB |
testcase_03 | AC | 615 ms
85,116 KB |
testcase_04 | AC | 573 ms
73,224 KB |
testcase_05 | AC | 815 ms
84,340 KB |
testcase_06 | AC | 578 ms
67,868 KB |
testcase_07 | AC | 269 ms
59,072 KB |
testcase_08 | AC | 339 ms
63,584 KB |
testcase_09 | AC | 230 ms
58,392 KB |
testcase_10 | AC | 434 ms
70,652 KB |
testcase_11 | AC | 883 ms
83,600 KB |
testcase_12 | AC | 710 ms
77,264 KB |
testcase_13 | AC | 409 ms
64,916 KB |
testcase_14 | AC | 203 ms
58,392 KB |
testcase_15 | AC | 589 ms
74,588 KB |
testcase_16 | AC | 944 ms
85,108 KB |
testcase_17 | AC | 939 ms
86,964 KB |
testcase_18 | AC | 408 ms
65,828 KB |
testcase_19 | AC | 961 ms
84,164 KB |
testcase_20 | AC | 245 ms
59,204 KB |
testcase_21 | AC | 329 ms
63,164 KB |
testcase_22 | AC | 562 ms
71,428 KB |
testcase_23 | AC | 662 ms
69,472 KB |
ソースコード
import java.util.*; import java.io.*; public class Main { static boolean[] arrived; static long[] cum; public static void main(String[] args) throws Exception { long mod = (long)Math.pow(10,9)+7; FastScanner sc = new FastScanner(System.in); int n = sc.nextInt(); int[] from = new int[n+1]; cum = new long[n+1]; for(int i = 1; i <= n; i++){ cum[i] += cum[i-1]+i; } for(int i = 0; i < n-1; i++){ int a = sc.nextInt(); int b = sc.nextInt(); from[b] = a; } long ans = 0; int[] step = new int[n+1]; boolean[] arrived = new boolean[n+1]; Deque<Integer> q = new ArrayDeque<>(); for(int i = 1; i <= n; i++){ int cnt = 0; if(arrived[i]){ continue; } int now = i; while(from[now] != 0){ if(arrived[now]){ cnt = step[now]; break; }else{ arrived[now] = true; q.add(now); } now = from[now]; } while(q.size() != 0){ long tmp = cum[q.size()+cnt]; ans += tmp; ans %= mod; int prev = q.poll(); step[prev] = q.size()+1+cnt; } } System.out.println(ans); } } class FastScanner { private BufferedReader reader = null; private StringTokenizer tokenizer = null; public FastScanner(InputStream in) { reader = new BufferedReader(new InputStreamReader(in)); tokenizer = null; } public String next() { if (tokenizer == null || !tokenizer.hasMoreTokens()) { try { tokenizer = new StringTokenizer(reader.readLine()); } catch (IOException e) { throw new RuntimeException(e); } } return tokenizer.nextToken(); } public String nextLine() { if (tokenizer == null || !tokenizer.hasMoreTokens()) { try { return reader.readLine(); } catch (IOException e) { throw new RuntimeException(e); } } return tokenizer.nextToken("\n"); } public long nextLong() { return Long.parseLong(next()); } public int nextInt() { return Integer.parseInt(next()); } public double nextDouble() { return Double.parseDouble(next()); } public String[] nextArray(int n) { String[] a = new String[n]; for (int i = 0; i < n; i++) a[i] = next(); return a; } public int[] nextIntArray(int n) { int[] a = new int[n]; for (int i = 0; i < n; i++) a[i] = nextInt(); return a; } public long[] nextLongArray(int n) { long[] a = new long[n]; for (int i = 0; i < n; i++) a[i] = nextLong(); return a; } }