How to Solve Minimum Number of Operations to Make String Sorted Problem
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Minimum Number of Operations to Make String Sorted
You are given a string s (0-indexed). You are asked to perform the following operation on s until you get a sorted string: Find the largest index i such that 1 <= i < s.length and s[i] < s...
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Understanding the Minimum Number of Operations to Make String Sorted Problem
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Problem Statement
You are given a string s (0-indexed). You are asked to perform the following operation on s until you get a sorted string: Find the largest index i such that 1 <= i < s.length and s[i] < s[i - 1]. Find the largest index j such that i <= j < s.length and s[k] < s[i - 1] for all the possible values of k in the range [i, j] inclusive. Swap the two characters at indices i - 1 and j. Reverse the suffix starting at index i. Return the number of operations needed to make the string sorted. Since the answer can be too large, return it modulo 109 + 7.
Minimum Number of Operations to Make String Sorted
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Examples
s = "cba"5The simulation goes as follows: Operation 1: i=2, j=2. Swap s[1] and s[2] to get s="cab", then reverse the suffix starting at 2. Now, s="cab". Operation 2: i=1, j=2. Swap s[0] and s[2] to get s="bac", then reverse the suffix starting at 1. Now, s="bca". Operation 3: i=2, j=2. Swap s[1] and s[2] to get s="bac", then reverse the suffix starting at 2. Now, s="bac". Operation 4: i=1, j=1. Swap s[0] and s[1] to get s="abc", then reverse the suffix starting at 1. Now, s="acb". Operation 5: i=2, j=2. Swap s[1] and s[2] to get s="abc", then reverse the suffix starting at 2. Now, s="abc".
s = "aabaa"2The simulation goes as follows: Operation 1: i=3, j=4. Swap s[2] and s[4] to get s="aaaab", then reverse the substring starting at 3. Now, s="aaaba". Operation 2: i=4, j=4. Swap s[3] and s[4] to get s="aaaab", then reverse the substring starting at 4. Now, s="aaaab".
Constraints
1 <= s.length <= 3000s consists only of lowercase English letters.How Interview Coder Helps with Leetcode Problems
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