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Dive into LeetCode 2598: Smallest Missing Non-negative Integer After Operations! In this video, we tackle a problem that seems complex at first but boils down to a clever trick with modulo arithmetic. We're given an array `nums` and a `value`, and our goal is to find the highest possible MEX (Minimum Excluded non-negative integer) by adding or subtracting `value` from the numbers.
The key insight is that the operation allows us to transform any number into another number as long as they share the same remainder when divided by `value`. This means we can reframe the problem: instead of the numbers themselves, we just need to count how many numbers we have for each possible remainder.
We'll walk through the simple and efficient greedy strategy that follows from this insight. By using a frequency map (or a Counter) to track our remainder counts, we can try to build the sequence 0, 1, 2, 3, ... until we find a number we can't make. That first missing number is our answer! This tutorial includes a detailed Python code breakdown and also provides the full solutions in Java, C++, and JavaScript.
Perfect for coding interview preparation and improving problem-solving skills.
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Solution Link:
https://leetcode.com/problems/smallest-missing-non-negative-integer-after-operations/editorial/
#leetcode #python #algorithms #codinginterview #dailycoding
