IOIPALIN - Palindrome 2000
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
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.
Output
The first line contains one integer, which is the desired minimal number.
Example
Input: 5 Ab3bd Output: 2
hide comments
mastik5h_1998:
2017-09-20 09:22:12
don't write anything extra and O(n*n) space complexity gives AC :)
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aman_9899:
2017-06-27 21:10:58
recursion..!!! |
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shubham8_:
2017-06-23 23:15:57
Just use scanf printf without space optimization it also passes |
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up79:
2017-06-07 21:31:21
who says time limit is strict ?
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da_201501181:
2017-06-06 07:06:46
NEEDS Space Optimisation..!! |
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cake_is_a_lie:
2017-03-04 00:13:28
cin/cout; string; 0.17-0.19s AC
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vengatesh15:
2017-01-28 10:34:07
Too strict Time limit.. |
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prasoonbatham:
2017-01-26 14:06:15
Too strict time limit.
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sas1905:
2016-12-21 19:52:57
space O(N^2) gets accepted with fast I/P in C++..
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sriraj:
2016-10-28 23:51:20
Too strict time constraints :/ long long int : TLE, int : AC
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Added by: | Gareev |
Date: | 2010-08-16 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: NODEJS OBJC PERL6 VB.NET |
Resource: | IOI 2000, Day 1 |