結果
問題 | No.425 ジャンケンの必勝法 |
ユーザー | hiromi_ayase |
提出日時 | 2016-09-22 23:34:57 |
言語 | Java21 (openjdk 21) |
結果 |
AC
|
実行時間 | 60 ms / 2,000 ms |
コード長 | 3,383 bytes |
コンパイル時間 | 2,697 ms |
コンパイル使用メモリ | 77,208 KB |
実行使用メモリ | 50,388 KB |
最終ジャッジ日時 | 2024-04-28 22:40:55 |
合計ジャッジ時間 | 4,326 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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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 | 56 ms
50,040 KB |
testcase_01 | AC | 57 ms
50,280 KB |
testcase_02 | AC | 57 ms
50,388 KB |
testcase_03 | AC | 57 ms
49,980 KB |
testcase_04 | AC | 57 ms
50,220 KB |
testcase_05 | AC | 57 ms
50,196 KB |
testcase_06 | AC | 57 ms
50,284 KB |
testcase_07 | AC | 55 ms
49,984 KB |
testcase_08 | AC | 56 ms
49,864 KB |
testcase_09 | AC | 56 ms
50,148 KB |
testcase_10 | AC | 56 ms
49,792 KB |
testcase_11 | AC | 57 ms
50,184 KB |
testcase_12 | AC | 57 ms
49,700 KB |
testcase_13 | AC | 56 ms
49,868 KB |
testcase_14 | AC | 57 ms
49,792 KB |
testcase_15 | AC | 57 ms
50,264 KB |
testcase_16 | AC | 57 ms
50,032 KB |
testcase_17 | AC | 58 ms
49,604 KB |
testcase_18 | AC | 57 ms
50,156 KB |
testcase_19 | AC | 60 ms
50,132 KB |
testcase_20 | AC | 57 ms
50,072 KB |
testcase_21 | AC | 57 ms
50,192 KB |
testcase_22 | AC | 57 ms
49,972 KB |
ソースコード
import java.io.IOException; import java.io.InputStream; import java.util.NoSuchElementException; public class Main { public static void main(String[] args) { FastScanner sc = new FastScanner(); int p0 = sc.nextInt(); int q = sc.nextInt(); double ret = 1.0 / 3; int N = 100; double[][][] dp = new double[N + 1][2][101]; // N回目に0:前回使った1前回使ってない 確率p // であいこ dp[0][1][p0] = 1.0 / 3; for (int i = 0; i < N; i++) { for (int p = 0; p <= 100; p++) { double v = (double) p / 100; dp[i + 1][0][Math.max(0, p - q)] += dp[i][0][p] * v / 2.0; dp[i + 1][0][Math.max(0, p - q)] += dp[i][1][p] * v / 2.0; dp[i + 1][1][Math.min(100, p + q)] += dp[i][0][p] * (1 - v) / 3.0; dp[i + 1][1][Math.min(100, p + q)] += dp[i][1][p] * (1 - v) / 3.0; ret += (dp[i][0][p] + dp[i][1][p]) * (v / 2.0 + (1 - v) / 3.0); } } System.out.println(ret); } } class FastScanner { public static String debug = null; private final InputStream in = System.in; private int ptr = 0; private int buflen = 0; private byte[] buffer = new byte[1024]; private boolean eos = false; private boolean hasNextByte() { if (ptr < buflen) { return true; } else { ptr = 0; try { if (debug != null) { buflen = debug.length(); buffer = debug.getBytes(); debug = ""; eos = true; } else { buflen = in.read(buffer); } } catch (IOException e) { e.printStackTrace(); } if (buflen < 0) { eos = true; return false; } else if (buflen == 0) { return false; } } return true; } private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1; } private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126; } private void skipUnprintable() { while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; } public boolean isEOS() { return this.eos; } 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() { return (int) nextLong(); } public long[] nextLongList(int n) { return nextLongTable(1, n)[0]; } public int[] nextIntList(int n) { return nextIntTable(1, n)[0]; } public long[][] nextLongTable(int n, int m) { long[][] ret = new long[n][m]; for (int i = 0; i < n; i++) { for (int j = 0; j < m; j++) { ret[i][j] = nextLong(); } } return ret; } public int[][] nextIntTable(int n, int m) { int[][] ret = new int[n][m]; for (int i = 0; i < n; i++) { for (int j = 0; j < m; j++) { ret[i][j] = nextInt(); } } return ret; } }