Recently in reviewing the content of data structure, especially how to calculate the time complexity of an algorithm.
In the course of solving the problem, we find an efficient algorithm of prime number solving, and analyze the time complexity of the algorithm.
Enter the code:/**copyright (c) 2014, College of Computer and Control engineering, Yantai University *all rights reserved.* file name: sum123.cpp* Creator: Lin Haiyun * Completion date: December 26, 2014 * Version number: v2.0** Problem Description: Enter a number of positive integers to output the primes. * Program input: Number of indeterminate positive inte
the general linear sieve methodGenprime and GenPrime2 are two implementations of the Sieve method for prime numbers, a way of thinking, which means different methods.#include #include#includeusing namespacestd; Const intMAXV = -;//Prime Table RangeBOOLflag[maxv+1];//flag Whether a number is primeintprime[maxv+1];//Prime
The classical algorithm determines whether an integer is a prime number1 /**2 determine whether a number is prime such as:3 Input: Any number4 output: 1 or 0 (1 = prime number) 05 */6 /************** is called a fool's practice **
Title: Determine the number of primes between 101-200 and the output of all primes.Idea: The method of judging primes: to remove 2 to sqrt (this number) with a number, if divisible, indicates that the number is not a prime, and vice versa is a
First you need to know two theorems:1: Fermat theorem: If P is prime, and gcd (a,p) = 1, then a(p-1) ≡1 (mod p). 2: Two-time detection theorem: If P is a prime number, X is a positive integer less than p, and then either X=1, or x=p-1. Proof: This is obvious, because the equivalent of P can divide, that is, p can divide (x+1) (x-1).Since P is a
Topic:Determines whether a number m is a prime.Defined:Prime number, is prime, we simply look at the definition of Baidu to the line, the prime numbers are defined as in the natural numbers greater than 1, in addition to 1 and itself no longer have other factors, such a number
Practical Introduction:████████████████████████████████ Scientific proof:████████████████████████████████ • Try to use Quick-pow and quick-mul acceleration in the operation. But actually tell us that, in the case of multiple sentences, the use of Quick-mul will slow down, the reason may be that the original% operation consumes a lot of time. (Repeat number t is more than 4, otherwise it is dangerous) • Rice cakes can only be used as "black box c
Question: determine the number of prime numbers between-and output all prime numbers.Program Analysis: Method for Determining prime numbers: Remove 2 to SQRT (This number) with a single number. If it can be divisible, it indicates
Question: determine the number of prime numbers between-and output all prime numbers.
ProgramAnalysis: Method for Determining prime numbers: Remove 2 to SQRT (This number) with a single number, if it can be integer
Di
素数的算法有很多种,现在主要讲两种算法及其改进版本的复杂度分析,解释性能提升的幅度。现以求100000内素数为例,两种算法分别是: 1.基础思路是去掉偶数,包括取模的范围,代码如下: print(2)For I in Range (3,100000,2):For a in range (3,int (i*0.5) +1,2):If i%a = = 0:BreakElsePrint (I,end = ")The complexity of this two-layer loop algorithm is 0.5n((n**0.5+1)/2) 2.应用一个素数定理:大于6的素数一定与6的倍数相邻,代码如下: print(2,3,end = ‘ ‘)t = 100000//6 + 1For I in Range (1,t):x = 6 * i-1For j in Range (3,int (x**0.5) +1,2):If x% J = = 0:Br
A prime number is divisible only by 1 or itself, and cannot be the product of two other integers. 1, 2, 3 itself is prime, to determine whether a number is prime, just use this value divided by 2 to its root number, if there is a
Package Com.test_java;
Import Java.util.Arrays;
public class Prime {* * * * * * * * To find the prime number within n/int n;
int i,j; Prime (int inputn) {this.
N = inputn;
//Normal Trial Division private void Comprime1_1 () {System.out.println ("less than" + N + "prime
1181 prime numbers in prime numbers (prime number Sieve method)Title Source: SguBase time limit: 1 seconds space limit: 131072 KB score: 0 Difficulty: Basic problemIf a prime number is a prime
Python determines whether the instance is a prime number or a prime number. python Prime Number
A natural number greater than 1 cannot be divisible by other natural numbers (
1181 prime number in prime number (prime number Sieve) topic Source: Sgu Base time limit: 1 second space limit: 131072 KB score: 0 Difficulty: Basic collection concern If a prime
The C language implementation of daffodils prime numbers prime factor decomposition, and daffodils vb
Recently, I flipped through the C language textbooks and read three interesting small programs, including: search for "Daffodils", judge whether a number is a prime number
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.