EppsNet Archive: Palindromes

Competitive Programming: SPOJ – Palindromes

A palindrome is a word, phrase, number or other sequence of units that has the property of reading the same in either direction, e.g. ‘racecar’, ‘solos’. Task You are given a number k (2 <= k <= 30000) and a non-empty string S whose length does not exceed 30000 lowercase letters. We say two palindromes are different when they start from different positions. How many different palindromes of the length k does S contains? Input The first line contains K. The second line contains S. K does not exceed the length of S. Output The first and only line should consist of a single number – the number of palindromes found. Example Input: 5 ababab Output: 2 Time limit: 0.100s Link to problem Solution below . . . Read more →

Competitive Programming: POJ 1159 – Palindrome

Description A palindrome is a symmetrical string, that is, a string read identically from left to right as well as from right to left. You are to write a program which, given a string, determines the minimal number of characters to be inserted into the string in order to obtain a palindrome. As an example, by inserting 2 characters, the string “Ab3bd” can be transformed into a palindrome (“dAb3bAd” or “Adb3bdA”). However, inserting fewer than 2 characters does not produce a palindrome. Input Your program is to read from standard input. The first line contains one integer: the length of the input string N, 3 <= N <= 5000. The second line contains one string with length N. The string is formed from uppercase letters from ‘A’ to ‘Z’, lowercase letters from ‘a’ to ‘z’ and digits from ‘0’ to ‘9’. Uppercase and lowercase letters are to be considered distinct.… Read more →