結果

問題 No.425 ジャンケンの必勝法
ユーザー tanzaku
提出日時 2016-09-22 22:43:32
言語 Java8
(openjdk 1.8.0.191)
結果
AC  
実行時間 992 ms
コード長 5,748 Byte
コンパイル時間 1,837 ms
使用メモリ 32,964 KB
最終ジャッジ日時 2019-07-12 16:58:15

テストケース

テストケース表示
入力 結果 実行時間
使用メモリ
00_sample1.txt AC 954 ms
32,104 KB
00_sample2.txt AC 958 ms
32,944 KB
00_sample3.txt AC 962 ms
32,964 KB
00_sample4.txt AC 960 ms
32,964 KB
00_sample5.txt AC 959 ms
32,284 KB
10_random1.txt AC 962 ms
32,708 KB
10_random2.txt AC 954 ms
32,252 KB
10_random3.txt AC 963 ms
32,104 KB
10_random4.txt AC 992 ms
32,288 KB
10_random5.txt AC 954 ms
32,108 KB
90_corner10.txt AC 959 ms
32,108 KB
99_corner1.txt AC 981 ms
32,112 KB
99_corner2.txt AC 957 ms
31,068 KB
99_corner3.txt AC 964 ms
32,104 KB
99_corner4.txt AC 972 ms
30,348 KB
99_corner5.txt AC 983 ms
32,684 KB
99_corner6.txt AC 979 ms
30,348 KB
99_corner7.txt AC 979 ms
31,100 KB
99_corner8.txt AC 957 ms
31,068 KB
99_corner9.txt AC 961 ms
32,932 KB
99_corner10.txt AC 954 ms
30,352 KB
system_test1.txt AC 962 ms
32,108 KB
system_test2.txt AC 952 ms
31,064 KB
テストケース一括ダウンロード

ソースコード

diff #
import java.io.*;
import java.math.*;
import java.util.*;

import static java.util.Arrays.*;

public class Main {
	private static final int mod = (int)1e9+7;

	final Random random = new Random(0);
	final IOFast io = new IOFast();

	/// MAIN CODE
	public void run() throws IOException {
//		int TEST_CASE = Integer.parseInt(new String(io.nextLine()).trim());
		int TEST_CASE = 1;
		while(TEST_CASE-- != 0) {
			int p0 = io.nextInt();
			int q = io.nextInt();
			
			double ans = 0;
			double[] p = new double[101];
			double[] p2 = new double[101];
			ans += 1/3.0;
			p[p0] = 1/3.0;
			for(int i = 0; i < 1000000; i++) {
				Arrays.fill(p2, 0.0);
				for(int j = 0; j <= 100; j++) {
					ans += p[j] * (j/100.0 * 0.5 + (1-j/100.0) * 1/3.0);
					p2[Math.max(j-q, 0)] += p[j] * j/100.0 * 0.5;
					p2[Math.min(j+q, 100)] += p[j] * (1-j/100.0) * 1/3.0;
				}
				double[] t = p; p = p2; p2 = t;
			}
			io.out.printf("%.10f\n", ans);
		}
	}
	
	/// TEMPLATE
	static int gcd(int n, int r) { return r == 0 ? n : gcd(r, n%r); }
	static long gcd(long n, long r) { return r == 0 ? n : gcd(r, n%r); }
	
	static <T> void swap(T[] x, int i, int j) { T t = x[i]; x[i] = x[j]; x[j] = t; }
	static void swap(int[] x, int i, int j) { int t = x[i]; x[i] = x[j]; x[j] = t; }
	
	static void dump(Object... o) { System.err.println(Arrays.deepToString(o)); } 
	
	void main() throws IOException {
		//		IOFast.setFileIO("rle-size.in", "rle-size.out");
		try { run(); }
		catch (EndOfFileRuntimeException e) { }
		io.out.flush();
	}
	public static void main(String[] args) throws IOException { new Main().main(); }
	
	static class EndOfFileRuntimeException extends RuntimeException {
		private static final long serialVersionUID = -8565341110209207657L; }

	static
	public class IOFast {
		private BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		private PrintWriter out = new PrintWriter(System.out);

		void setFileIn(String ins) throws IOException { in.close(); in = new BufferedReader(new FileReader(ins)); }
		void setFileOut(String outs) throws IOException { out.flush(); out.close(); out = new PrintWriter(new FileWriter(outs)); }
		void setFileIO(String ins, String outs) throws IOException { setFileIn(ins); setFileOut(outs); }

		private static int pos, readLen;
		private static final char[] buffer = new char[1024 * 8];
		private static char[] str = new char[500*8*2];
		private static boolean[] isDigit = new boolean[256];
		private static boolean[] isSpace = new boolean[256];
		private static boolean[] isLineSep = new boolean[256];

		static { for(int i = 0; i < 10; i++) { isDigit['0' + i] = true; } isDigit['-'] = true; isSpace[' '] = isSpace['\r'] = isSpace['\n'] = isSpace['\t'] = true; isLineSep['\r'] = isLineSep['\n'] = true; }
		public int read() throws IOException { if(pos >= readLen) { pos = 0; readLen = in.read(buffer); if(readLen <= 0) { throw new EndOfFileRuntimeException(); } } return buffer[pos++]; }
		public int nextInt() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); int i = 0; int ret = 0; if(str[0] == '-') { i = 1; } for(; i < len; i++) ret = ret * 10 + str[i] - '0'; if(str[0] == '-') { ret = -ret; } return ret; }
		public long nextLong() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); int i = 0; long ret = 0; if(str[0] == '-') { i = 1; } for(; i < len; i++) ret = ret * 10 + str[i] - '0'; if(str[0] == '-') { ret = -ret; } return ret; }
		public char nextChar() throws IOException { while(true) { final int c = read(); if(!isSpace[c]) { return (char)c; } } }
		int reads(int len, boolean[] accept) throws IOException { try { while(true) { final int c = read(); if(accept[c]) { break; } if(str.length == len) { char[] rep = new char[str.length * 3 / 2]; System.arraycopy(str, 0, rep, 0, str.length); str = rep; } str[len++] = (char)c; } } catch(EndOfFileRuntimeException e) { ; } return len; }
		int reads(char[] cs, int len, boolean[] accept) throws IOException { try { while(true) { final int c = read(); if(accept[c]) { break; } cs[len++] = (char)c; } } catch(EndOfFileRuntimeException e) { ; } return len; }
		public char[] nextLine() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isLineSep); try { if(str[len-1] == '\r') { len--; read(); } } catch(EndOfFileRuntimeException e) { ; } return Arrays.copyOf(str, len); }
		public String nextString() throws IOException { return new String(next()); }
		public char[] next() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); return Arrays.copyOf(str, len); }
//		public int next(char[] cs) throws IOException { int len = 0; cs[len++] = nextChar(); len = reads(cs, len, isSpace); return len; }
		public double nextDouble() throws IOException { return Double.parseDouble(nextString()); }
		public long[] nextLongArray(final int n) throws IOException { final long[] res = new long[n]; for(int i = 0; i < n; i++) { res[i] = nextLong(); } return res; }
		public int[] nextIntArray(final int n) throws IOException { final int[] res = new int[n]; for(int i = 0; i < n; i++) { res[i] = nextInt(); } return res; }
		public int[][] nextIntArray2D(final int n, final int k) throws IOException { final int[][] res = new int[n][]; for(int i = 0; i < n; i++) { res[i] = nextIntArray(k); } return res; }
		public int[][] nextIntArray2DWithIndex(final int n, final int k) throws IOException { final int[][] res = new int[n][k+1]; for(int i = 0; i < n; i++) { for(int j = 0; j < k; j++) { res[i][j] = nextInt(); } res[i][k] = i; } return res; }
		public double[] nextDoubleArray(final int n) throws IOException { final double[] res = new double[n]; for(int i = 0; i < n; i++) { res[i] = nextDouble(); } return res; }
	}
}
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