結果
問題 |
No.1995 CHIKA Road
|
ユーザー |
![]() |
提出日時 | 2022-09-27 09:39:46 |
言語 | Java (openjdk 23) |
結果 |
TLE
|
実行時間 | - |
コード長 | 2,744 bytes |
コンパイル時間 | 2,849 ms |
コンパイル使用メモリ | 89,616 KB |
実行使用メモリ | 116,840 KB |
最終ジャッジ日時 | 2024-12-22 16:36:36 |
合計ジャッジ時間 | 57,928 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 25 TLE * 12 |
ソースコード
import java.io.*; import java.util.*; public class Main { public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int n = sc.nextInt(); int m = sc.nextInt(); int[] lefts = new int[m]; int[] rights = new int[m]; TreeMap<Integer, Integer> compress = new TreeMap<>(); for (int i = 0; i < m; i++) { lefts[i] = sc.nextInt(); rights[i] = sc.nextInt(); compress.put(lefts[i], null); compress.put(rights[i], null); } int size = 0; for (int x : compress.keySet()) { compress.put(x, size++); } HashMap<Integer, Integer> graph = new HashMap<>(); for (int i = 0; i < m; i++) { graph.put(compress.get(lefts[i]), Math.min(graph.getOrDefault(compress.get(lefts[i]), Integer.MAX_VALUE), compress.get(rights[i]))); } int[] costs = new int[size]; PriorityQueue<Path> queue = new PriorityQueue<>(); queue.add(new Path(0, 1)); while (queue.size() > 0) { Path p = queue.poll(); if (costs[p.idx] >= p.value) { continue; } costs[p.idx] = p.value; if (graph.containsKey(p.idx)) { queue.add(new Path(graph.get(p.idx), p.value + 1)); } if (p.idx < size - 1) { queue.add(new Path(p.idx + 1, p.value)); } } System.out.println((n - 1) * 2 - costs[size - 1] + 1); } static class Path implements Comparable<Path> { int idx; int value; public Path(int idx, int value) { this.idx = idx; this.value = value; } public int compareTo(Path another) { if (value == another.value) { return idx - another.idx; } else { return another.value - value; } } } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); StringBuilder sb = new StringBuilder(); public Scanner() throws Exception { } public int nextInt() throws Exception { return Integer.parseInt(next()); } public long nextLong() throws Exception { return Long.parseLong(next()); } public double nextDouble() throws Exception { return Double.parseDouble(next()); } public String next() throws Exception { while (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } return st.nextToken(); } }