sieve method to find prime numbers

Http://www.cnblogs.com/rausen/p/4138233.html#include "Sieve method for prime number" "mass factor decomposition" bzoj2721 [Violet 5] Cherry blossom

#include #includeinttab[1000001];//use macros to define MAX laterintMain ()//if you want to make a table including 1000000, the array will open a large{ inta,d,n,i,j; tab[0]=0; tab[1]=0; for(i=2;i1000001; i++) Tab[i]=1; for(i=2; i1000000; i++)//personally feel that the back half is not necessary to traverse, because twice times must be greater than 1000000 { if(Tab[i] = =1) { for(j=2; j*i1000000; J + +) {Tab[i*j]=0; } } } while(SCANF (" %d%d%d", a,

This is a very typical screening method. The complexity is not very high by using a small Interval Length and a small number of prime numbers.It is recommended to enable long. In many cases, it is hard to notice where int will pop up.In addition, you can estimate the order of magnitude to overwrite the prime number table. Do not repeat the

How many prime numbersTime limit:3000/1000 MS (java/others) Memory limit:32768/32768 K (java/others)Total submission (s): 12955 Accepted Submission (s): 4490Problem Description Give you a lot of positive integers, just to find out how many prime numbers there is.Input There is a lot of cases. In each case, there is a i

Python uses the evaluate method to calculate all prime numbers smaller than the given number. python prime numbers The example in this article shares with you the specific code for python to calculate all prime

Title Description: In addition to itself, the number that cannot be divisible by other integers is called prime, and it is simple to ask for prime numbers, but how to quickly find prime numbers has always been a task for programme

Use the root number method to search for prime numbers within 1000, c ++ code instances, and running result examples, and 1000 prime numbers Use the root code to search for the example of a prime number c ++ code with a value le

des the number of representations for the input Integer as the sum of one or more consecutive prime numbers. no other characters shoshould be inserted in the output. Sample Input 2 3 17 41 20 666 12 53 0 Sample output 1 1 2 3 0 0 1 2 Source Japan 2005 Question: A number can be obtained by summation of several consecutive prime number sequences, for exampl

second section, the problem is solved, but is there a more witty way to find the primes within n? The answer is yes. Here we mention two kinds: 1, we think of such a question, in addition to 2, the remaining number of even is not likely to be prime? Obviously impossible, so we again in [2, +1] Excluding half of the calculation, then to see the odd, 1 is not prime