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
lvlpbl: 2017-03-28 00:29:02

care about 10^0

krishna29: 2017-03-23 18:36:19

I am new here , i see comments AC in one go . whats that mean?

da_201501181: 2017-03-06 15:34:00

AC in one GO..!! Mod 4 logic simple..!!

Last edit: 2017-03-06 16:06:16
rayhan50001: 2017-02-26 22:05:33

easy problem.. ac in one go bigmod :D

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.

Added by:Jose Daniel Rodriguez Morales
Time limit:0.340s
Source limit:700B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: GOSU