How to Solve String Compression I I Problem
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String Compression II
Run-length encoding is a string compression method that works by replacing consecutive identical characters (repeated 2 or more times) with the concatenation of the character and the number marking th...
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Understanding the String Compression I I Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Run-length encoding is a string compression method that works by replacing consecutive identical characters (repeated 2 or more times) with the concatenation of the character and the number marking the count of the characters (length of the run). For example, to compress the string "aabccc" we replace "aa" by "a2" and replace "ccc" by "c3". Thus the compressed string becomes "a2bc3". Notice that in this problem, we are not adding '1' after single characters. Given a string s and an integer k. You need to delete at most k characters from s such that the run-length encoded version of s has minimum length. Find the minimum length of the run-length encoded version of s after deleting at most k characters.
String Compression II
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Examples
s = "aaabcccd", k = 24Compressing s without deleting anything will give us "a3bc3d" of length 6. Deleting any of the characters 'a' or 'c' would at most decrease the length of the compressed string to 5, for instance delete 2 'a' then we will have s = "abcccd" which compressed is abc3d. Therefore, the optimal way is to delete 'b' and 'd', then the compressed version of s will be "a3c3" of length 4.
s = "aabbaa", k = 22If we delete both 'b' characters, the resulting compressed string would be "a4" of length 2.
s = "aaaaaaaaaaa", k = 03Since k is zero, we cannot delete anything. The compressed string is "a11" of length 3.
Constraints
1 <= s.length <= 1000 <= k <= s.lengths contains only lowercase English letters.How Interview Coder Helps with Leetcode Problems
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