{ "data": { "question": { "questionId": "2154", "questionFrontendId": "2027", "boundTopicId": null, "title": "Minimum Moves to Convert String", "titleSlug": "minimum-moves-to-convert-string", "content": "

You are given a string s consisting of n characters which are either 'X' or 'O'.

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A move is defined as selecting three consecutive characters of s and converting them to 'O'. Note that if a move is applied to the character 'O', it will stay the same.

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Return the minimum number of moves required so that all the characters of s are converted to 'O'.

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Example 1:

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\nInput: s = "XXX"\nOutput: 1\nExplanation: XXX -> OOO\nWe select all the 3 characters and convert them in one move.\n
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Example 2:

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\nInput: s = "XXOX"\nOutput: 2\nExplanation: XXOX -> OOOX -> OOOO\nWe select the first 3 characters in the first move, and convert them to 'O'.\nThen we select the last 3 characters and convert them so that the final string contains all 'O's.
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Example 3:

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\nInput: s = "OOOO"\nOutput: 0\nExplanation: There are no 'X's in s to convert.\n
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Constraints:

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Compiled with clang 11 using the latest C++ 20 standard.

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Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.

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Most standard library headers are already included automatically for your convenience.

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OpenJDK 17. Java 8 features such as lambda expressions and stream API can be used.

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Most standard library headers are already included automatically for your convenience.

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Includes Pair class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.

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Python 2.7.12.

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Most libraries are already imported automatically for your convenience, such as array, bisect, collections. If you need more libraries, you can import it yourself.

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For Map/TreeMap data structure, you may use sortedcontainers library.

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Note that Python 2.7 will not be maintained past 2020. For the latest Python, please choose Python3 instead.

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Compiled with gcc 8.2 using the gnu11 standard.

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C# 10 with .NET 6 runtime

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Node.js 16.13.2.

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Ruby 3.1

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Some common data structure implementations are provided in the Algorithms module: https://www.rubydoc.info/github/kanwei/algorithms/Algorithms

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Swift 5.5.2.

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Go 1.21

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Python 3.10.

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Scala 2.13.7.

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Rust 1.58.1

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Run with Racket 8.3.

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Dart 2.17.3

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