結果

問題 No.25 有限小数
ユーザー uwiuwi
提出日時 2015-02-18 22:13:37
言語 Java21
(openjdk 21)
結果
AC  
実行時間 76 ms / 5,000 ms
コード長 3,774 bytes
コンパイル時間 4,086 ms
コンパイル使用メモリ 80,036 KB
実行使用メモリ 38,168 KB
最終ジャッジ日時 2024-11-15 21:08:55
合計ジャッジ時間 6,924 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge2
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 66 ms
37,888 KB
testcase_01 AC 74 ms
37,888 KB
testcase_02 AC 71 ms
37,704 KB
testcase_03 AC 67 ms
37,852 KB
testcase_04 AC 67 ms
37,800 KB
testcase_05 AC 69 ms
38,072 KB
testcase_06 AC 68 ms
37,648 KB
testcase_07 AC 75 ms
37,708 KB
testcase_08 AC 68 ms
37,708 KB
testcase_09 AC 68 ms
37,660 KB
testcase_10 AC 67 ms
37,584 KB
testcase_11 AC 67 ms
37,988 KB
testcase_12 AC 76 ms
37,568 KB
testcase_13 AC 67 ms
37,736 KB
testcase_14 AC 66 ms
37,668 KB
testcase_15 AC 70 ms
37,812 KB
testcase_16 AC 65 ms
37,576 KB
testcase_17 AC 69 ms
37,784 KB
testcase_18 AC 73 ms
37,672 KB
testcase_19 AC 69 ms
37,636 KB
testcase_20 AC 67 ms
37,876 KB
testcase_21 AC 67 ms
37,920 KB
testcase_22 AC 64 ms
37,536 KB
testcase_23 AC 69 ms
37,512 KB
testcase_24 AC 69 ms
38,168 KB
testcase_25 AC 67 ms
37,940 KB
testcase_26 AC 75 ms
37,684 KB
testcase_27 AC 66 ms
37,812 KB
testcase_28 AC 76 ms
37,564 KB
testcase_29 AC 67 ms
37,780 KB
testcase_30 AC 69 ms
37,940 KB
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ソースコード

diff # 

package q0xx;
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 Q70 {
	static InputStream is;
	static PrintWriter out;
	static String INPUT = "";
	
	static void solve()
	{
		long n = nl(), d = nl();
		long g = gcd(n, d);
		n /= g; d /= g;
		
		long dd = d;
		while(dd % 2 == 0)dd /= 2;
		while(dd % 5 == 0)dd /= 5;
		if(dd != 1){
			out.println(-1);
			return;
		}
		
		while(d != 1){
			n %= d;
			if(d % 5 == 0){
				d /= 5;
			}else{
				n *= 5;
			}
			if(d % 2 == 0){
				d /= 2;
			}else{
				n *= 2;
			}
		}
		
		while(n % 10 == 0)n /= 10;
		out.println(n % 10);
	}
	
	public static long gcd(long a, long b) {
		while (b > 0) {
			long c = a;
			a = b;
			b = c % b;
		}
		return a;
	}
	
	
	public static void main(String[] args) throws Exception
	{
		long S = System.currentTimeMillis();
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		solve();
		out.flush();
		long G = System.currentTimeMillis();
		tr(G-S+"ms");
	}
	
	private static boolean eof()
	{
		if(lenbuf == -1)return true;
		int lptr = ptrbuf;
		while(lptr < lenbuf)if(!isSpaceChar(inbuf[lptr++]))return false;
		
		try {
			is.mark(1000);
			while(true){
				int b = is.read();
				if(b == -1){
					is.reset();
					return true;
				}else if(!isSpaceChar(b)){
					is.reset();
					return false;
				}
			}
		} catch (IOException e) {
			return true;
		}
	}
	
	private static byte[] inbuf = new byte[1024];
	static int lenbuf = 0, ptrbuf = 0;
	
	private static 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 static boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private static int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private static double nd() { return Double.parseDouble(ns()); }
	private static char nc() { return (char)skip(); }
	
	private static 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 static 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 static 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 static int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private static int ni()
	{
		int num = 0, 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 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) { if(INPUT.length() != 0)System.out.println(Arrays.deepToString(o)); }
}
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