| | | 1 | | // -------------------------------------------------------------------------------- |
| | | 2 | | // Copyright (C) 2025 Eugene Eremeev (also known as Yevhenii Yeriemeieiv). |
| | | 3 | | // All Rights Reserved. |
| | | 4 | | // -------------------------------------------------------------------------------- |
| | | 5 | | // This software is the confidential and proprietary information of Eugene Eremeev |
| | | 6 | | // (also known as Yevhenii Yeriemeieiv) ("Confidential Information"). You shall not |
| | | 7 | | // disclose such Confidential Information and shall use it only in accordance with |
| | | 8 | | // the terms of the license agreement you entered into with Eugene Eremeev (also |
| | | 9 | | // known as Yevhenii Yeriemeieiv). |
| | | 10 | | // -------------------------------------------------------------------------------- |
| | | 11 | | |
| | | 12 | | namespace LeetCode.Algorithms.CheckIfAnyElementHasPrimeFrequency; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc /> |
| | | 15 | | public abstract class CheckIfAnyElementHasPrimeFrequencyBase : ICheckIfAnyElementHasPrimeFrequency |
| | | 16 | | { |
| | | 17 | | protected const int Count = 101; |
| | | 18 | | |
| | 1 | 19 | | private static readonly bool[] Primes = GeneratePrimes(Count); |
| | | 20 | | |
| | | 21 | | public abstract bool CheckPrimeFrequency(int[] nums); |
| | | 22 | | |
| | | 23 | | protected static bool IsPrime(int number) |
| | 119 | 24 | | { |
| | 119 | 25 | | return Primes[number]; |
| | 119 | 26 | | } |
| | | 27 | | |
| | | 28 | | private static bool[] GeneratePrimes(int max) |
| | 1 | 29 | | { |
| | 1 | 30 | | var isPrime = new bool[max + 1]; |
| | | 31 | | |
| | 1 | 32 | | if (max >= 2) |
| | 1 | 33 | | { |
| | 1 | 34 | | isPrime[2] = true; |
| | 1 | 35 | | } |
| | | 36 | | |
| | 102 | 37 | | for (var i = 3; i <= max; i += 2) |
| | 50 | 38 | | { |
| | 50 | 39 | | isPrime[i] = true; |
| | 50 | 40 | | } |
| | | 41 | | |
| | 10 | 42 | | for (var p = 3; p * p <= max; p += 2) |
| | 4 | 43 | | { |
| | 4 | 44 | | if (!isPrime[p]) |
| | 1 | 45 | | { |
| | 1 | 46 | | continue; |
| | | 47 | | } |
| | | 48 | | |
| | 62 | 49 | | for (var multiple = p * p; multiple <= max; multiple += p * 2) |
| | 28 | 50 | | { |
| | 28 | 51 | | isPrime[multiple] = false; |
| | 28 | 52 | | } |
| | 3 | 53 | | } |
| | | 54 | | |
| | 1 | 55 | | if (max >= 2) |
| | 1 | 56 | | { |
| | 1 | 57 | | isPrime[2] = true; |
| | 1 | 58 | | } |
| | | 59 | | |
| | 1 | 60 | | if (max >= 3) |
| | 1 | 61 | | { |
| | 1 | 62 | | isPrime[3] = true; |
| | 1 | 63 | | } |
| | | 64 | | |
| | 1 | 65 | | if (max >= 0) |
| | 1 | 66 | | { |
| | 1 | 67 | | isPrime[0] = false; |
| | 1 | 68 | | } |
| | | 69 | | |
| | 1 | 70 | | if (max >= 1) |
| | 1 | 71 | | { |
| | 1 | 72 | | isPrime[1] = false; |
| | 1 | 73 | | } |
| | | 74 | | |
| | 1 | 75 | | return isPrime; |
| | 1 | 76 | | } |
| | | 77 | | } |