結果
| 問題 |
No.6 使いものにならないハッシュ
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2016-03-06 12:08:48 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 97 ms / 5,000 ms |
| コード長 | 3,719 bytes |
| コンパイル時間 | 2,414 ms |
| コンパイル使用メモリ | 78,632 KB |
| 実行使用メモリ | 39,524 KB |
| 最終ジャッジ日時 | 2024-09-16 16:32:15 |
| 合計ジャッジ時間 | 5,563 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 32 |
ソースコード
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.NoSuchElementException;
public class Main {
static boolean[] prime;
public static void main(String[] args) {
FastScanner sc = new FastScanner();
int K = sc.nextInt();
int N = sc.nextInt();
prime = new boolean[N+1];
prime[1] = true;
for (int i=2; i*i<=N; i++) {
if (prime[i]) continue;
for (int j=i*2; j<=N; j+=i) {
prime[j] = true;
}
}
ArrayList<Integer> list = new ArrayList<>();
for (int i=K; i<=N; i++) {
if (!prime[i]) {
list.add(i);
}
}
ArrayDeque<Integer> q = new ArrayDeque<>();
int ans = 0;
int max = 0;
for (int i=list.size()-1; i>=0; i--) {
int hash = list.get(i)%9;
if (q.contains(hash)) {
while (hash != q.poll());
}
q.add(hash);
if (q.size() > max) {
max = q.size();
ans = list.get(i);
}
}
System.out.println(ans);
}
}
class FastScanner {
private final InputStream in = System.in;
private final byte[] buffer = new byte[1024];
private int ptr = 0;
private int buflen = 0;
private boolean hasNextByte() {
if (ptr < buflen) {
return true;
}else{
ptr = 0;
try {
buflen = in.read(buffer);
} catch (IOException e) {
e.printStackTrace();
}
if (buflen <= 0) {
return false;
}
}
return true;
}
private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
private boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}
public boolean hasNext() { skipUnprintable(); return hasNextByte();}
public String next() {
if (!hasNext()) throw new NoSuchElementException();
StringBuilder sb = new StringBuilder();
int b = readByte();
while(isPrintableChar(b)) {
sb.appendCodePoint(b);
b = readByte();
}
return sb.toString();
}
public long nextLong() {
if (!hasNext()) throw new NoSuchElementException();
long n = 0;
boolean minus = false;
int b = readByte();
if (b == '-') {
minus = true;
b = readByte();
}
if (b < '0' || '9' < b) {
throw new NumberFormatException();
}
while(true){
if ('0' <= b && b <= '9') {
n *= 10;
n += b - '0';
}else if(b == -1 || !isPrintableChar(b)){
return minus ? -n : n;
}else{
throw new NumberFormatException();
}
b = readByte();
}
}
public int nextInt() {
if (!hasNext()) throw new NoSuchElementException();
int n = 0;
boolean minus = false;
int b = readByte();
if (b == '-') {
minus = true;
b = readByte();
}
if (b < '0' || '9' < b) {
throw new NumberFormatException();
}
while(true){
if ('0' <= b && b <= '9') {
n *= 10;
n += b - '0';
}else if(b == -1 || !isPrintableChar(b)){
return minus ? -n : n;
}else{
throw new NumberFormatException();
}
b = readByte();
}
}
}