How to Solve Find Valid Pair of Adjacent Digits in String Problem
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Find Valid Pair of Adjacent Digits in String
You are given a string s consisting only of digits. A valid pair is defined as two adjacent digits in s such that: The first digit is not equal to the second. Each digit in the pair appears in s exact...
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Understanding the Find Valid Pair of Adjacent Digits in String Problem
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Problem Statement
You are given a string s consisting only of digits. A valid pair is defined as two adjacent digits in s such that: The first digit is not equal to the second. Each digit in the pair appears in s exactly as many times as its numeric value. Return the first valid pair found in the string s when traversing from left to right. If no valid pair exists, return an empty string.
Find Valid Pair of Adjacent Digits in String
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Examples
s = "2523533""23"Digit '2' appears 2 times and digit '3' appears 3 times. Each digit in the pair "23" appears in s exactly as many times as its numeric value. Hence, the output is "23".
s = "221""21"Digit '2' appears 2 times and digit '1' appears 1 time. Hence, the output is "21".
s = "22"""There are no valid adjacent pairs.
Constraints
2 <= s.length <= 100s only consists of digits from '1' to '9'.How Interview Coder Helps with Leetcode Problems
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