counting sort 0ms cpp py3 Leetcode1833
貪婪計數排序速解Leetcode 1833 Maximum Ice Cream Bars
[codes on Leetcode]https://leetcode.com/problems/maximum-ice-cream-bars/solutions/8348036/greedy-counting-sortbeats-100-by-anwende-x10v/
#anwendeng
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影片章節時戳 |Video Timeline & Detailed Chapters
00:00 - Introduction & Problem Overview
00:00:04: Introduction to Leetcode 1833 "Maximum Ice Cream Bars."
00:00:23: Showcasing the 0ms C++ result (Beating 100%).
00:00:45 - Logic & Greedy Strategy Analysis
00:01:20: Explaining the Greedy approach: Why buying the cheapest bars first maximizes the count.
00:02:06: Transitioning to Counting Sort for optimal linear time complexity.
00:02:25: Walking through Example 1, 2, and 3 to demonstrate the strategy with different budgets.
00:03:07 - Constraints & Space Complexity
00:03:15: Analyzing data constraints (10^5 elements and values) to justify the use of a frequency array.
00:03:45 - C++ Code Walkthrough (0ms Solution)
00:04:19: Setting up the frequency array and finding the maximum price.
00:04:47: Implementing the frequency counting loop.
00:05:15: Detailed logic on calculating how many bars can be bought at price x and updating the coins balance.
00:06:00: Final C++ submission and performance verification.
00:06:09 - Python 3 Implementation (39ms Solution)
00:06:29: Coding the Python version: Finding xmax and initializing the count list.
00:07:50: Using enumerate for efficient iteration over the price frequencies.
00:09:15: Implementing the Greedy purchasing logic in Python.
00:10:38: Python submission results: 39ms (Beating 95.97%).
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