Sphere Online Judge

SPOJ Problem Set (classical)

5. The Next Palindrome

Problem code: PALIN

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

Added by:Adrian Kosowski
Time limit:2s-9s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel Pentium G860 3GHz)
Languages:All except: NODEJS PERL 6 SCM chicken

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2015-03-04 16:30:05 palak bhatia
please indicate whats "wrong" with my answer submitted..since my all test cases are coming out to be correct...my not able to identify the problem

Last edit: 2015-03-04 16:30:42
2015-03-02 07:02:48 John Jost
Just wanted to comment that the input does not end on a newline character. Check that your program is not expecting one if it gets TLE.
2015-03-02 06:59:38 John Jost
Narendra: For a single digit the output would be the next largest single digit. So 7 would be 8. 9 would be 11.
2015-03-01 22:01:29 Narendra pal
Admin....what should be output of single digit int.......and if u can hint some corner cases.....thanks in advance

Last edit: 2015-03-01 22:13:07
2015-02-28 17:06:17 fullmetal
Thanx for u r great help Piyush
2015-02-28 11:30:09 Omkar Acharya
I have considered all possible test cases and the output seems to be correct. Still it is saying "wrong output".. Please Help Me..!!
2015-02-26 11:12:19 sasirekha
gopala krishna i answering to ur doubt.
palindrome means the letter we read from right to left and left to right must remain same.eg:mom,818.you misunderstood value 2, it indicates number of input value.
2015-02-24 15:05:00 gopala krishna
small doubt in the question...i couldnt understand the line numbers should be displayed without leading zeroes..i am new.please explain me that line

re(vamsi): you have to output the smallest palindrome larger than K, so if the input is 2 you have to output 3 not 11. Also you shouldn't print any leading 0s you have to print 3 not 03, 003 or something else

Last edit: 2015-02-25 17:07:32
2015-02-24 14:59:54 gopala krishna
i have a small doubt.
if. we give input 2 why cant the output be 11 because it is also a
palindrome ...please clarify my doubt
2015-02-21 15:53:21 rish
can we post our code here?i just want to know what am i doing wrong? my code seems to work fine ,but still getting WA .
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