Last active
September 5, 2017 22:46
-
-
Save MerlinTwi/bc986dec4f6f872ebc2c15752b4bf677 to your computer and use it in GitHub Desktop.
Псевдорандомный перебор всех чисел от 1..x
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// Псевдорандомно перебирает все числа (кроме 0) без повторов | |
// https://ru.wikipedia.org/wiki/Регистр_сдвига_с_линейной_обратной_связью | |
uint feed = 0x12; // для результата в 5 бит | |
uint i = 1; | |
do { | |
if ((i & 1) != 0) | |
i = (i >> 1) ^ feed; | |
else | |
i = (i >> 1); | |
Console.Write(" "+i); // как-то используем полученное число i | |
} while (i != 1); | |
// Output: 18 9 22 11 23 25 30 15 21 24 12 6 3 19 27 31 29 28 14 7 17 26 13 20 10 5 16 8 4 2 1 | |
/* | |
https://users.ece.cmu.edu/~koopman/lfsr/index.html | |
биты, диапазон, варианты feed | |
3 [1..7] - 6 | |
4 [1..0xF] - 0x9, 0xC | |
5 [1..0x1F] - 0x12, 0x14, 0x1E | |
6 [1..0x3F] - 0x21, 0x2D, 0x39 | |
7 [1..0x7F] - 0x41, 0x44, 0x53 | |
8 [1..0xFF] - 0x8E, 0x95, 0xFA | |
9 [1..0x1FF] - 0x108, 0x10D, 0x1FD | |
10 [1..0x3FF] - 0x204, 0x216, 0x3FC | |
11 [1..0x7FF] - 0x402, 0x40B, 0x64B | |
12 [1..0xFFF] - 0x829, 0x834, 0xD8F | |
13 [1..0x1FFF] - 0x100D, 0x1013, 0x1296 | |
14 [1..0x3FFF] - 0x2015, 0x201C, 0x2496 | |
15 [1..0x7FFF] - 0x4001, 0x4008, 0x4357 | |
16 [1..0xFFFF] - 0x8016, 0x801C, 0x8679 | |
... | |
20 [1..0xFFFFF] - 0x80004, 0x8033D, 0x807B8 | |
24 [1..0xFFFFFF] - 0x80000D, 0x800422, 0x800B87 | |
28 [1..0xFFFFFFF] - 0x8000004, 0x800016C, 0x80009E3 | |
32 [1..0xFFFFFFFF] - 0x80000057, 0x800004F3, 0x80000EA6 | |
64 [1..0xFFFFFFFFFFFFFFFF] - 0x800000000000000D, 0x8000000000000D0F, 0x80000000000019E2 (uint заменить на ulong) | |
*/ |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment