Count double palindromes in given int sequence

Posted by jakubmal on Stack Overflow See other posts from Stack Overflow or by jakubmal
Published on 2010-06-09T20:11:17Z Indexed on 2010/06/09 20:32 UTC
Read the original article Hit count: 164

Filed under:

algorithm

|

palindrome

|

maybe-homework

For a given int sequence check number of double palindromes, where by double palindrome we mean sequence of two same palindromes without break between them. So for example:

in 1 0 1 1 0 1 we have 1 0 1 as a palindrome which appears 2 times without a break,

in 1 0 1 5 1 0 1 we have 1 0 1 but it's separated

(apart from the other palindromes in these sequences)

Problem example test data is:

3

12 0 1 1 0 0 1 1 0 0 1 1 0

12 1 0 1 0 1 0 1 0 1 0 1 0

6 3 3 3 3 3 3

with answers

8 0 9

Manacher is obvious for the begging, but I'm not sure what to do next. Any ideas appreciated. Complexity should be below n^2 I guess.

EDIT: int is here treated as single element of alphabet

© Stack Overflow or respective owner

Related posts about algorithm

Jpeg Algorithm vs BMP Algorithm?

as seen on Super User - Search for 'Super User'
I'm just wonder, what the differences are between creating a BMP file algorithm and JPG file algorithm ? If you know the others images' format algorithm, please post them. Thanks. >>> More
word disambiguation algorithm (Lesk algorithm)

as seen on Stack Overflow - Search for 'Stack Overflow'
Hii.. Can anybody help me to find an algorithm in Java code to find synonyms of a search word based on the context and I want to implement the algorithm with WordNet database. For example, "I am running a Java program". From the context, I want to find the synonyms for the word "running", but the… >>> More
Search algorithm (with a sort algorithm already implemented)

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, Im doing a Java application and Im facing some doubts in which concerns performance. I have a PriorityQueue which guarantees me the element removed is the one with greater priority. That PriorityQueue has instances of class Event (which implements Comparable interface). Each Event is associated… >>> More
Is there any algorithm for finding LINES by PIXEL COLORS on picture?

as seen on Stack Overflow - Search for 'Stack Overflow'
So I have Image like this I want to get something like this (I hevent drawn all lines I want but I hope you can get my idea) I need algorithm for finding all straight lines on it by just reading colors of pixels. No hard math, no Haar, no Hough. Some algorithm which would be based on points… >>> More
collsion issues with quadtree [on hold]

as seen on Game Development - Search for 'Game Development'
So i implemented a Quad tree in Java for my 2D game and everything works fine except for when i run my collision detection algorithm, which checks if a object has hit another object and which side it hit.My problem is 80% of the time the collision algorithm works but sometimes the objects just go… >>> More

Related posts about palindrome

java palindrome help

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm creating a program that checks if a word or phrase is a palindrome. I have the actual "palindrome tester" figured out. What I'm stuck with is where and what to place in my code to have the console read out "Enter palindrome..." and then text. I've tried with IO but it doesnt work out right… >>> More
Palindrome Golf

as seen on Stack Overflow - Search for 'Stack Overflow'
The goal: Any language. The smallest function which will return whether a string is a palindrome. Here is mine in Python: R=lambda s:all(a==b for a,b in zip(s,reversed(s))) 50 characters. The accepted answer will be the current smallest one - this will change as smaller ones are found. Please… >>> More
How to check for palindrome using Python logic

as seen on Stack Overflow - Search for 'Stack Overflow'
My background is only a 6 month college class in basic C/C++, and I'm trying to convert to Python. I may be talking nonsense, but it seems to me C, at least at my level, is very for-loop intensive. I solve most problems with these loops. And it seems to me the biggest mistake people do when going… >>> More
Given an integer, determine if it is a Palindrome in less than O(n) [on hold]

as seen on Programmers - Search for 'Programmers'
There is an O(n) solution to the problem of determining if an integer is a palindrome below. Is it possible to solve this problem in O(log n) or better? static void IsPalindrome(int Number) { int OrignalNum = Number; int Reverse = 0; int Remainder = 0; if… >>> More
Taking User Input in Java

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm creating a program that checks if a word or phrase is a palindrome. I have the actual "palindrome tester" figured out. What I'm stuck with is where and what to place in my code to have the console read out "Enter palindrome..." and then text. I've tried with IO but it doesnt work out right… >>> More