Largest Number After Mutating Substring at Infosys

Problem Description

You are given a string `num`, which represents a large integer. You are also given a **0-indexed** integer array `change` of length `10` that maps each digit `0-9` to another digit. More formally, digit `d` maps to digit `change[d]`. You may **choose** to **mutate a single substring** of `num`. To...

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