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
arbb145: 2017-05-24 10:17:50

2 WA because power 0 :(

ramesh_961: 2017-05-22 13:51:26

Easy if you know N%4 logic!! Check for it in geeksforgeeks if not!!

saurabh_1680: 2017-05-21 10:44:37

have consiered every case still getting wrong answer ...can someone tell me some testcases

adnanli: 2017-05-17 07:02:08

Last edit: 2017-05-17 07:06:08
alphastar: 2017-05-14 20:04:41

finally did it. a and b can be zero!!

spartax: 2017-04-28 20:21:45

O(t) solution

valkyre: 2017-04-10 19:37:43

getting a TLE. Please help.

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

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