結果
| 問題 | No.1340 おーじ君をさがせ |
| コンテスト | |
| ユーザー |
tenten
|
| 提出日時 | 2023-06-07 09:22:32 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 203 ms / 2,000 ms |
| コード長 | 3,439 bytes |
| 記録 | |
| コンパイル時間 | 5,506 ms |
| コンパイル使用メモリ | 83,944 KB |
| 実行使用メモリ | 43,468 KB |
| 最終ジャッジ日時 | 2024-12-29 15:09:25 |
| 合計ジャッジ時間 | 12,568 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 59 |
ソースコード
import java.io.*;
import java.util.*;
import java.util.stream.*;
public class Main {
public static void main(String[] args) throws Exception {
Scanner sc = new Scanner();
int n = sc.nextInt();
int m = sc.nextInt();
long t = sc.nextLong();
BitSet[][] graph = new BitSet[60][n];
for (int i = 0; i < n; i++) {
graph[0][i] = new BitSet();
}
for (int i = 0; i < m; i++) {
graph[0][sc.nextInt()].add(sc.nextInt());
}
for (int i = 1; i < 60; i++) {
for (int j = 0; j < n; j++) {
graph[i][j] = new BitSet();
}
for (int j = 0; j < n; j++) {
for (int k = 0; k < n; k++) {
if (graph[i - 1][j].get(k)) {
graph[i][j].or(graph[i - 1][k]);
}
}
}
}
BitSet ans = new BitSet();
ans.add(0);
for (int i = 59; i >= 0; i--) {
if (t < (1L << i)) {
continue;
}
t -= (1L << i);
BitSet next = new BitSet();
for (int j = 0; j < n; j++) {
if (ans.get(j)) {
next.or(graph[i][j]);
}
}
ans = next;
}
System.out.println(ans.getCount());
}
static class BitSet {
long[] values = new long[2];
public void add(int x) {
values[x / 60] |= (1L << (x % 60));
}
public boolean get(int x) {
return (values[x / 60] & (1L << (x % 60))) > 0;
}
public void or(BitSet x) {
for (int i = 0; i < 2; i++) {
values[i] |= x.values[i];
}
}
public int getCount() {
long pop = 0;
for (long x : values) {
pop += getPop(x);
}
return (int)pop;
}
private long getPop(long x) {
long pop = 0;
while (x > 0) {
pop += x % 2;
x >>= 1;
}
return pop;
}
}
}
class Utilities {
static String arrayToLineString(Object[] arr) {
return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
}
static String arrayToLineString(int[] arr) {
return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
}
}
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 int[] nextIntArray() throws Exception {
return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
}
public String next() throws Exception {
while (!st.hasMoreTokens()) {
st = new StringTokenizer(br.readLine());
}
return st.nextToken();
}
}
tenten