結果

問題 No.407 鴨等素数間隔列の数え上げ
ユーザー uwiuwi
提出日時 2016-08-05 23:43:19
言語 Java21
(openjdk 21)
結果
AC  
実行時間 150 ms / 1,000 ms
コード長 4,608 bytes
コンパイル時間 4,348 ms
コンパイル使用メモリ 87,288 KB
実行使用メモリ 46,528 KB
最終ジャッジ日時 2024-12-15 22:22:41
合計ジャッジ時間 10,560 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge5
このコードへのチャレンジ
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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 141 ms
45,516 KB
testcase_01 AC 132 ms
46,196 KB
testcase_02 AC 139 ms
45,568 KB
testcase_03 AC 130 ms
46,092 KB
testcase_04 AC 132 ms
46,140 KB
testcase_05 AC 135 ms
46,336 KB
testcase_06 AC 144 ms
45,768 KB
testcase_07 AC 145 ms
46,144 KB
testcase_08 AC 132 ms
45,572 KB
testcase_09 AC 137 ms
45,460 KB
testcase_10 AC 135 ms
45,464 KB
testcase_11 AC 148 ms
46,348 KB
testcase_12 AC 136 ms
45,660 KB
testcase_13 AC 137 ms
45,772 KB
testcase_14 AC 144 ms
45,512 KB
testcase_15 AC 139 ms
45,660 KB
testcase_16 AC 137 ms
45,564 KB
testcase_17 AC 141 ms
45,764 KB
testcase_18 AC 145 ms
45,716 KB
testcase_19 AC 142 ms
45,660 KB
testcase_20 AC 144 ms
46,408 KB
testcase_21 AC 138 ms
45,464 KB
testcase_22 AC 137 ms
45,460 KB
testcase_23 AC 124 ms
46,320 KB
testcase_24 AC 139 ms
45,740 KB
testcase_25 AC 146 ms
46,220 KB
testcase_26 AC 138 ms
45,564 KB
testcase_27 AC 138 ms
45,716 KB
testcase_28 AC 140 ms
45,484 KB
testcase_29 AC 147 ms
46,176 KB
testcase_30 AC 133 ms
46,396 KB
testcase_31 AC 150 ms
46,528 KB
testcase_32 AC 135 ms
45,696 KB
testcase_33 AC 143 ms
45,728 KB
testcase_34 AC 144 ms
45,664 KB
testcase_35 AC 141 ms
45,816 KB
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ソースコード

diff # 

package contest;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class N407 {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		int n = ni(), L = ni();
		int[] primes = sieveEratosthenes(10000000);
		long ret = 0;
		for(int p : primes){
			if((long)p*(n-1) <= L){
				ret += L-p*(n-1)+1;
			}
		}
		out.println(ret);
	}
	
	public static int[] sieveEratosthenes(int n) {
		if (n <= 32) {
			int[] primes = { 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31 };
			for (int i = 0; i < primes.length; i++) {
				if (n < primes[i]) {
					return Arrays.copyOf(primes, i);
				}
			}
			return primes;
		}

		int u = n + 32;
		double lu = Math.log(u);
		int[] ret = new int[(int) (u / lu + u / lu / lu * 1.5)];
		ret[0] = 2;
		int pos = 1;

		int[] isnp = new int[(n + 1) / 32 / 2 + 1];
		int sup = (n + 1) / 32 / 2 + 1;

		int[] tprimes = { 3, 5, 7, 11, 13, 17, 19, 23, 29, 31 };
		for (int tp : tprimes) {
			ret[pos++] = tp;
			int[] ptn = new int[tp];
			for (int i = (tp - 3) / 2; i < tp << 5; i += tp)
				ptn[i >> 5] |= 1 << (i & 31);
			for (int j = 0; j < sup; j += tp) {
				for (int i = 0; i < tp && i + j < sup; i++) {
					isnp[j + i] |= ptn[i];
				}
			}
		}

		// 3,5,7
		// 2x+3=n
		int[] magic = { 0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13, 31, 22, 28, 18, 26, 10, 7, 12, 21, 17,
				9, 6, 16, 5, 15, 14 };
		int h = n / 2;
		for (int i = 0; i < sup; i++) {
			for (int j = ~isnp[i]; j != 0; j &= j - 1) {
				int pp = i << 5 | magic[(j & -j) * 0x076be629 >>> 27];
				int p = 2 * pp + 3;
				if (p > n)
					break;
				ret[pos++] = p;
				if ((long) p * p > n)
					continue;
				for (int q = (p * p - 3) / 2; q <= h; q += p)
					isnp[q >> 5] |= 1 << q;
			}
		}

		return Arrays.copyOf(ret, pos);
	}

	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//			@Override
//			public void run() {
//				long s = System.currentTimeMillis();
//				solve();
//				out.flush();
//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//			}
//		};
//		t.start();
//		t.join();
	}
	
	public static void main(String[] args) throws Exception { new N407().run(); }
	
	private byte[] inbuf = new byte[1024];
	private int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}
	
	private char[][] nm(int n, int m) {
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[][] nmi(int n, int m) {
		int[][] map = new int[n][];
		for(int i = 0;i < n;i++)map[i] = na(m);
		return map;
	}
	
	private int ni() { return (int)nl(); }
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}
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