結果
| 問題 |
No.1995 CHIKA Road
|
| コンテスト | |
| ユーザー |
tenten
|
| 提出日時 | 2022-09-27 09:31:14 |
| 言語 | Java (openjdk 23) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 2,760 bytes |
| コンパイル時間 | 2,640 ms |
| コンパイル使用メモリ | 79,968 KB |
| 実行使用メモリ | 146,856 KB |
| 最終ジャッジ日時 | 2024-12-22 16:34:41 |
| 合計ジャッジ時間 | 65,641 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 22 TLE * 15 |
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++);
}
ArrayList<ArrayList<Integer>> graph = new ArrayList<>();
for (int i = 0; i < size; i++) {
graph.add(new ArrayList<>());
}
for (int i = 0; i < m; i++) {
graph.get(compress.get(lefts[i])).add(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;
for (int x : graph.get(p.idx)) {
queue.add(new Path(x, 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();
}
}
tenten