PRIME1 - Prime Generator

Peter wants to generate some prime numbers for his cryptosystem. Help him! Your task is to generate all prime numbers between two given numbers!


The input begins with the number t of test cases in a single line (t<=10). In each of the next t lines there are two numbers m and n (1 <= m <= n <= 1000000000, n-m<=100000) separated by a space.


For every test case print all prime numbers p such that m <= p <= n, one number per line, test cases separated by an empty line.


1 10
3 5


Warning: large Input/Output data, be careful with certain languages (though most should be OK if the algorithm is well designed)


After cluster change, please consider PRINT as a more challenging problem.

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the_nine_tail: 2020-04-09 07:33:11

@shruthi123 use long int for such case

trulyness: 2020-04-08 19:12:53

I tried this problem with sieve, but it doesn't seem to work in this case. Can anyone tell me why that's the case? But just writing an isPrime function that simply loops till the square root of n works. Why is that so?

sang611: 2020-04-08 12:12:32

One punch AC :))

anand_yadav1: 2020-04-06 12:11:27

Don't getting why the f*** this is giving me wring answer. Done everything right, I'm 100% sure.

soni_p: 2020-04-05 16:25:02

I am getting correct o/p in ideone, but it's showing wrong answer here, can someone explain why?

shruthi123: 2020-03-31 17:28:49

Can any one explain me how to print the inputs m and n with this condition (1 <= m <= n <= 1000000000, n-m<=100000) . I am writing the code in c++, and I am not knowing how to give the inputs.

anshbhatti: 2020-03-30 04:29:08

I am getting a TLE (Time Limit Exceeded) when the code works in my IDE. My code is simply looping through square root of each number to check if it's prime.

Last edit: 2020-03-30 04:29:49
ali_a: 2020-03-27 12:49:11

use trial division method. Run the loop till sqrt of n. No need to use any kind of Sieves for this simple problem.

supriya9: 2020-03-26 06:21:19

when i am running my code in other IDE... my code is correct and giving the correct output but when i submit it here it is displaying time limit exceeded .
someone please help me out of this?

shammya: 2020-03-25 17:42:39

i used Fermat's primality test algorithm which takes O(k*log(n)) to check whether a number is prime or not.
i took k = 20 and got AC with .56 sec.
just iterate from m to n and check whether the number is prime or not .
time complexity O(n*logn).
hope it helps : )

Last edit: 2020-03-25 17:42:59

Added by:Adam Dzedzej
Time limit:6s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: NODEJS PERL6