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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ankush: 2014-06-26 20:56:46

How can I have the test cases which were given to my program during submission and validation ?

Mitch Schwartz: 2014-06-26 20:40:48

@Asheesh: Complaining angrily about not knowing how things work on the first day of joining a site isn't what I would call interesting. (1) Python is a slower language. There are several Python3 solvers for this problem, but you may need to pay more attention to optimisation concerns compared with other languages; (2) NZEC in Java should mean an exception was thrown -- an error that could be prevented by careful programming; (3) compilation errors are the easiest for users to diagnose; you can click on "compilation error" and read the error yourself. You can also see the name of the compiler when you submit. It should be no surprise that some compilers behave differently from others.

Asheesh Pathak: 2014-06-26 20:20:35

This is bullshit. Got time limit exceeded in Python 3, run time error in JAVA 6 and f**king compilation error in C++ 4.3.2 even though they all work fine in my system, and the interesting thing is that I joined SPOJ only today.

Sethu Iyer: 2014-06-21 12:18:31

Very good problem , spent 7 hrs in this problem for AC in 1 go and i got it. simply worth it

Jens Stimpfle: 2014-06-18 22:58:07

Warning: DOS Line endings (\r\n)

chin: 2014-06-08 05:38:53

after long trial ...finally AC!!!!..:D

Mitch Schwartz: 2014-06-02 10:23:56

@Ɓukasz Kuszner: Thank you!

kuszi: 2014-06-02 08:42:37

@Mitch Schwartz && cegprakash: after the long rejudge it appeared that about 30% of previously accepted solutions was incorrect. Thank you very much!

Last edit: 2014-06-02 08:43:36
Dmitri: 2014-05-13 15:09:33

Was worried if my program would take 1 000 000 chars string with Console.ReadLine() in C#. But got solution accepted at the first attempt :)

The Mama of Coding: 2014-04-24 20:24:06

awesome problem!!! but not for beginners... took me 6 hours to fully understand it. thumbs up

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