Submit | All submissions | Best solutions | Back to list |
DIV - Divisors |
Let N be a positive integer. In theory it is easy to decide if d(N) (the number of positive divisors of N including 1 and N) is prime or not. Your task is just a little bit harder: compute all N in [1,10^6] for which d(N)=p*q where p and q distinct primes.
Input
There is no input for this problem.
Output
To make the problem less io related write out only every 9-th of them, one per line.
Output: 50 99 162 ... 999524 999728 999927
Added by: | czylabsonasa |
Date: | 2005-05-16 |
Time limit: | 0.705s |
Source limit: | 3333B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All |
Resource: | Folklore. |
hide comments
|
|||||||
2017-06-24 20:33:11
easy one... |
|||||||
2017-06-19 16:11:22 kp
Removed from todo list after 2 years 10 days. phew |
|||||||
2017-06-07 13:04:09
A/C in third attempt, funny thing is I had gotten to 1.5 seconds by using a heavily optimized but incorrect implementation. Got it to 0.4 with the correct logic. Hint : Corollary of Prime Sieve. |
|||||||
2017-03-27 00:12:06
AC in one go!! nice question use sieve and prime factorization Last edit: 2017-03-27 00:12:37 |
|||||||
2016-12-25 20:47:31
thanks @mohitgupta07 |
|||||||
2016-09-16 19:01:27
SPOJ really doesn't like java... the same code give tle in java but runs in c :( Great problem though. |
|||||||
2016-09-04 18:37:41 Anuj Arora
Phewww...........one mistake cost me multiple SIGFPE .....and 3 hours |
|||||||
2016-05-11 00:11:10
to Solve this ques..try for classical problem NDIV too :P :P u need to then just tweak ur algo to get answer for this one..nd whosoever r confused.. hint:- 6=2*3 but 30=2*3*5 :) |
|||||||
2016-02-27 09:35:17 minhthai
a must do! |
|||||||
2015-05-23 09:39:58 Aditya Kumar
Really enjoyed Sieve+ d(N) + a little bit of implementation |