PALIN - The Next Palindrome

A positive integer is called a palindrome if its representation in the decimal system is the same when read from left to right and from right to left. For a given positive integer K of not more than 1000000 digits, write the value of the smallest palindrome larger than K to output. Numbers are always displayed without leading zeros.


The first line contains integer t, the number of test cases. Integers K are given in the next t lines.


For each K, output the smallest palindrome larger than K.




Warning: large Input/Output data, be careful with certain languages

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asitm9: 2014-12-04 04:03:34

@Jasdeep: check for 10. It should be 11.

Last edit: 2014-12-04 04:04:15
gamer496: 2014-12-03 22:59:22

@admin could you check my solution i'm
getting wa even after checking all the corner cases
id 13050031
@asitm9 thank you for you test case finally submitted

Last edit: 2014-12-04 10:15:06
asitm9: 2014-12-03 09:55:22

AC in 3rd GO... :)

Last edit: 2014-12-04 03:53:09
Mayank Ladia: 2014-12-03 09:38:20

Finally.. :') just coz of array size cost me 3 ..

Minsuk Kim: 2014-11-27 09:28:45

Nice problem - a hint is to think about the cases for the odd number of digits and even number of digits separately

Rafael Cunha de Almeida: 2014-11-19 04:10:12

I can't figure out which number is breaking my code :( I've made a test case of thousands of random numbers and they all passed. I'm out of ideas :(

NPR: 2014-11-18 12:23:02

Hi! I want to know if anybody can send to me a list with all cases of input ? My problem is that I'm not sure if input can be for example: 005 and if it can, which is the next palindrome ? 6 or 101 ? Thank you

HARSH MADHOGARIA: 2014-11-10 21:44:08
cnt find the mistake please help!!!

kp: 2014-11-07 10:03:50

Ans for 000000 should have been 1 or 11 but its different..showing with toolkit!! anybody to explain??

Manraj Singh: 2014-11-06 09:36:22

This is one question that teaches you case handling.

SPOJ please start saving default complier.Costed me one Compilation error. :'(

[reply by cyclops: Did you go to and select a default programming language?]

Last edit: 2014-11-06 12:05:31

Added by:adrian
Time limit:2s-9s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: NODEJS PERL6

Problem's scores 1 vote

Concept difficulty
Concept difficulty 37%
Implementation difficulty
Implementation difficulty 50%
458 16