How to Solve Decremental String Concatenation Problem
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Decremental String Concatenation
You are given a 0-indexed array words containing n strings. Let's define a join operation join(x, y) between two strings x and y as concatenating them into xy. However, if the last character of x is equal to the first character of y, one of them is deleted. For example join("ab", "ba") = "aba" and join("ab", "cde") = "abcde". You are to perform n - 1 join operations. Let str0 = words[0]. Starting from i = 1 up to i = n - 1, for the ith operation, you can do one of the following: Your task is to minimize the length of strn - 1. Return an integer denoting the minimum possible length of strn - 1.
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Understanding the Decremental String Concatenation Problem
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Problem Statement
You are given a 0-indexed array words containing n strings. Let's define a join operation join(x, y) between two strings x and y as concatenating them into xy. However, if the last character of x is equal to the first character of y, one of them is deleted. For example join("ab", "ba") = "aba" and join("ab", "cde") = "abcde". You are to perform n - 1 join operations. Let str0 = words[0]. Starting from i = 1 up to i = n - 1, for the ith operation, you can do one of the following: Your task is to minimize the length of strn - 1. Return an integer denoting the minimum possible length of strn - 1.
Decremental String Concatenation
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Examples
# Example 1
words = ["aa","ab","bc"]
4
# Example 2
words = ["ab","b"]
2
# Example 3
words = ["aaa","c","aba"]
6
Constraints
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Solve Decremental String Concatenation — You are given a 0-indexed array words containing n strings. Let's define a join ...
Here's the optimal approach using Array:
Time: O(n) | Space: O(n)
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