FACT0 - Integer Factorization (15 digits)

This is a problem to test the robustness of your Integer Factorization algorithm.

Given some integers, you need to factor them into product of prime numbers.

The largest integer given in the input file has 15 digits. FACT1 is a harder version of this problem (the numbers are larger).

You may need to use a general factorization algorithm since no special numbers (e.g. Fermat numbers) are considered when designing the input data.


There are several numbers given, each one in a line.

The input ends with a number 0.

The number of test cases is about 10.


For each number, print in a line the factorization of it. See examples below for the output format.



317^1 9817^1
17^2 89^1 509^1
328439^1 234884407^1

hide comments
chandan_5362: 2020-07-02 10:41:10

I am getting TLE for this problem even after using sieve method in PYTHON3.
Any suggestions!!!

adikrmishra_1: 2020-06-17 17:24:16

just use factorization in sqrt(n) time :)
for help :)

lm10_piyush: 2019-11-21 16:37:12

I have tried sieve with prime integer factorization but it gives me WA, anyone suggests any issue, I've test my code on many test cases it works fine.. largest number is 999999999999999 (9 15times).

Last edit: 2019-11-21 16:41:57
zarif_2002: 2019-11-02 09:04:02

Just do basic sieve before approaching. that's it.

drdrunkenstein: 2019-08-23 20:42:08

Python 3 gets tle for trial division

scolar_fuad: 2019-07-02 14:01:17

Easy just use primefactorization of number

karan_yadav: 2018-07-07 10:48:37

Brute force works!!!
Guess no. of test cases is low

zephyr_96: 2018-05-19 09:47:49

Precal using sieve will give TLE. Normal O(root(n)) works. :|

ameyanator: 2018-04-01 22:16:52

Well if you know how to calculate the number of divisors of a number in sqrt(N) time then this is a easy question I guess

jayharsh: 2017-08-15 16:06:15

you will get TLE in brute force but optimize it and your code will work

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