LASTDIG - The last digit

Nestor was doing the work of his math class about three days but he is tired of make operations a lot and he should deliver his task tomorrow. His math’s teacher gives him two numbers a and b. The problem consist of finding the last digit of the potency of base a and index b. Help Nestor with his problem. You are given two integer numbers: the base a (0 <= a <= 20) and the index b (0 <= b <= 2,147,483,000), a and b both are not 0. You have to find the last digit of ab.


The first line of input contains an integer t, the number of test cases (t <= 30). t test cases follow. For each test case will appear a and b separated by space.


For each test case output an integer per line representing the result.


3 10
6 2

Output: 9 6

hide comments
nitisha1: 2017-02-24 14:13:34

finally AC!!!

draculla: 2017-02-10 16:28:14

quite simple..AC in one go...just use pen and paper ..

rohit9934: 2017-02-10 10:58:02

AC in one go for the 1st time in C++.Was that even a problem?Too easy

akhil9093: 2017-02-08 22:28:40

couldn't do it in one go .. was missing a single case..!!but overall the question was totally pattern dependent

skeukry: 2017-02-07 19:01:03

Help! Why do I get WA (18717784) (haskell)? :c It works for every test case even b=0 or a=0

Last edit: 2017-02-07 19:03:57
giriprasad kemburu: 2017-01-27 13:06:26

Got AC after 4 WA.Forgot to check 0 in power[any power zero =1].
#My 25th.

dgfreak: 2017-01-24 15:29:59

If you're using exponentiation, you're doing it wrong :D

dhruv19: 2016-12-20 14:55:46

@koko4nut please help me i am getting a TLE how can i optimize my code

tejman1809: 2016-12-16 15:26:54

@koko4nut Thank You, but what exactly is the mistake because of which its not getting accepted?

koko4nut: 2016-12-16 09:24:21

@tejman1809 . Your test is successful returning "0" when a = b = 0.
Or this operation is not permitted like a division by 0.
And indent properly your code! for your own good and others!!!
It felt like having nails scratching my eye balls.

Last edit: 2016-12-16 09:30:00

Added by:Jose Daniel Rodriguez Morales
Time limit:1s
Source limit:700B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: GOSU