Minimum Penalty for a Shop 🔥 | LeetCode 2483 | Prefix Sum + Greedy | Optimal Solution

In this video, we solve LeetCode 2483 – Minimum Penalty for a Shop, a prefix + greedy optimization problem.

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Code:
https://leetcode.com/problems/minimum...

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You are given a string customers consisting of 'Y' and 'N' where:

'Y' means customers come at that hour.
'N' means no customers come.

If the shop is:

Open and no customers come → penalty +1
Closed and customers come → penalty +1

Your task is to choose the best closing hour to minimize the total penalty.

🔗 Problem Link:
https://leetcode.com/problems/minimum...

Approach

Count the penalty if the shop is always closed initially.

Traverse the string and adjust penalty:

If 'Y', opening earlier reduces penalty.

If 'N', staying open increases penalty.

Track the hour where penalty becomes minimum.

Time Complexity: O(n)
Space Complexity: O(1)

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