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Grokking the Coding Interview Patterns in C++

Solution: Maximum Swap

Discover how to solve the Maximum Swap problem by applying greedy techniques. Learn to identify and swap digits to form the largest possible number by scanning from right to left. This lesson helps you efficiently implement and understand the solution with O(n) time complexity.

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Statement

Given an integer num, return the maximum number that can be formed by swapping at most two digits once.

Constraints:

  • 0≤0 \leq num ≤105\leq 10^5 ...