Reducing Dishes
We should aim to cook the dishes with higher satisfaction levels later, since the liketime coefficient is a product of time and satisfaction. We can use a greedy algorithm to find the maximum sum of the liketime coefficient.
Here’s the detailed approach:
Sort the Satisfaction: Start by sorting the satisfaction array in descending order. This ensures that the dishes with higher satisfaction are prepared later.
Calculate the Liketime Coefficient: Iterate through the sorted satisfaction array and prepare the dishes in that order. Keep track of the running sum of satisfaction and the total liketime coefficient. If at any point the running sum becomes nonpositive, break the loop as preparing further dishes will not improve the total liketime coefficient.
Return the Result: Return the total liketime coefficient.


Example:
 With the input
satisfaction = [1, 8, 0, 5, 9]
, the sorted array will be[5, 0, 1, 8, 9]
. The running sum will be5, 5, 4, 4
, and the total liketime coefficient will be5 + 5 + 4 = 14
, which is the correct output.
This solution ensures a time complexity of O(n log n) due to sorting, and it satisfies the given constraints.
10 Prerequisite LeetCode Problems
“Reducing Dishes” requires understanding of sorting and the concept of cumulative sum. Here are 10 problems:
“Maximum Subarray” (LeetCode Problem #53): This problem introduces the concept of finding a subarray with the maximum possible sum, which is a simpler version of the main problem.
“Best Time to Buy and Sell Stock” (LeetCode Problem #121): This problem requires understanding of basic array manipulation and tracking of maximum and minimum values, which will help you approach the “Reducing Dishes” problem.
“Assign Cookies” (LeetCode Problem #455): This problem involves sorting and greedy algorithms which are fundamental concepts used in “Reducing Dishes”.
“Partition Labels” (LeetCode Problem #763): This problem involves sorting and partitioning, which is also a strategy used in “Reducing Dishes”.
“Running Sum of 1d Array” (LeetCode Problem #1480): This problem introduces the concept of maintaining a running total of an array, a useful concept for the “Reducing Dishes” problem.
“Minimum Absolute Difference” (LeetCode Problem #1200): This problem involves sorting and pairwise comparison, which will help in understanding how to organize dishes for maximum satisfaction.
“Array Partition I” (LeetCode Problem #561): This problem also involves sorting and summing certain elements, similar to the “Reducing Dishes” problem.
“Candy” (LeetCode Problem #135): This problem has a similar flavor in terms of distributing items (candies/dishes) based on certain conditions to maximize or satisfy certain criteria.
“Task Scheduler” (LeetCode Problem #621): This problem involves scheduling to maximize certain criteria, which is similar to how dishes need to be arranged in the “Reducing Dishes” problem.
“Last Stone Weight” (LeetCode Problem #1046): This problem involves repeatedly selecting elements in a certain order until a condition is met, which is a skill that will come in handy for the “Reducing Dishes” problem.
Problem Classification
Problem Statement: A chef has collected data on the satisfaction level of his n dishes. Chef can cook any dish in 1 unit of time. Liketime coefficient of a dish is defined as the time taken to cook that dish including previous dishes multiplied by its satisfaction level i.e. time[i] * satisfaction[i]. Return the maximum sum of liketime coefficient that the chef can obtain after dishes preparation. Dishes can be prepared in any order and the chef can discard some dishes to get this maximum value.
Example 1:
Input: satisfaction = [1,8,0,5,9] Output: 14 Explanation: After Removing the second and last dish, the maximum total liketime coefficient will be equal to (11 + 02 + 5*3 = 14). Each dish is prepared in one unit of time.
Example 2:
Input: satisfaction = [4,3,2] Output: 20 Explanation: Dishes can be prepared in any order, (21 + 32 + 4*3 = 20)
Example 3:
Input: satisfaction = [1,4,5] Output: 0 Explanation: People do not like the dishes. No dish is prepared.
Constraints:
n == satisfaction.length 1 <= n <= 500 1000 <= satisfaction[i] <= 1000
Analyze the provided problem statement. Categorize it based on its domain, ignoring ‘How’ it might be solved. Identify and list out the ‘What’ components. Based on these, further classify the problem. Explain your categorizations.
Visual Model of the Problem
How to visualize the problem statement for this problem?
Problem Restatement
Could you start by paraphrasing the problem statement in your own words? Try to distill the problem into its essential elements and make sure to clarify the requirements and constraints. This exercise should aid in understanding the problem better and aligning our thought process before jumping into solving it.
Abstract Representation of the Problem
Could you help me formulate an abstract representation of this problem?
Alternatively, if you’re working on a specific problem, you might ask something like:
Given this problem, how can we describe it in an abstract way that emphasizes the structure and key elements, without the specific realworld details?
Terminology
Are there any specialized terms, jargon, or technical concepts that are crucial to understanding this problem or solution? Could you define them and explain their role within the context of this problem?
Problem Simplification and Explanation
Could you please break down this problem into simpler terms? What are the key concepts involved and how do they interact? Can you also provide a metaphor or analogy to help me understand the problem better?
Constraints
Given the problem statement and the constraints provided, identify specific characteristics or conditions that can be exploited to our advantage in finding an efficient solution. Look for patterns or specific numerical ranges that could be useful in manipulating or interpreting the data.
What are the key insights from analyzing the constraints?
Case Analysis
Could you please provide additional examples or test cases that cover a wider range of the input space, including edge and boundary conditions? In doing so, could you also analyze each example to highlight different aspects of the problem, key constraints and potential pitfalls, as well as the reasoning behind the expected output for each case? This should help in generating key insights about the problem and ensuring the solution is robust and handles all possible scenarios.
Identification of Applicable Theoretical Concepts
Can you identify any mathematical or algorithmic concepts or properties that can be applied to simplify the problem or make it more manageable? Think about the nature of the operations or manipulations required by the problem statement. Are there existing theories, metrics, or methodologies in mathematics, computer science, or related fields that can be applied to calculate, measure, or perform these operations more effectively or efficiently?
Problem Breakdown and Solution Methodology
Given the problem statement, can you explain in detail how you would approach solving it? Please break down the process into smaller steps, illustrating how each step contributes to the overall solution. If applicable, consider using metaphors, analogies, or visual representations to make your explanation more intuitive. After explaining the process, can you also discuss how specific operations or changes in the problem’s parameters would affect the solution? Lastly, demonstrate the workings of your approach using one or more example cases.
Inference of ProblemSolving Approach from the Problem Statement
How did you infer from the problem statement that this problem can be solved using ?
Stepwise Refinement
Could you please provide a stepwise refinement of our approach to solving this problem?
How can we take the highlevel solution approach and distill it into more granular, actionable steps?
Could you identify any parts of the problem that can be solved independently?
Are there any repeatable patterns within our solution?
Solution Approach and Analysis
Given the problem statement, can you explain in detail how you would approach solving it? Please break down the process into smaller steps, illustrating how each step contributes to the overall solution. If applicable, consider using metaphors, analogies, or visual representations to make your explanation more intuitive. After explaining the process, can you also discuss how specific operations or changes in the problem’s parameters would affect the solution? Lastly, demonstrate the workings of your approach using one or more example cases.
Thought Process
Explain the thought process by thinking step by step to solve this problem from the problem statement and code the final solution. Write code in Python3. What are the cues in the problem statement? What direction does it suggest in the approach to the problem? Generate insights about the problem statement.
From Brute Force to Optimal Solution
Could you please begin by illustrating a brute force solution for this problem? After detailing and discussing the inefficiencies of the brute force approach, could you then guide us through the process of optimizing this solution? Please explain each step towards optimization, discussing the reasoning behind each decision made, and how it improves upon the previous solution. Also, could you show how these optimizations impact the time and space complexity of our solution?
Coding Constructs
Consider the following piece of complex software code.
What are the highlevel problemsolving strategies or techniques being used by this code?
If you had to explain the purpose of this code to a nonprogrammer, what would you say?
Can you identify the logical elements or constructs used in this code, independent of any programming language?
Could you describe the algorithmic approach used by this code in plain English?
What are the key steps or operations this code is performing on the input data, and why?
Can you identify the algorithmic patterns or strategies used by this code, irrespective of the specific programming language syntax?
Language Agnostic Coding Drills
Your mission is to deconstruct this code into the smallest possible learning units, each corresponding to a separate coding concept. Consider these concepts as unique coding drills that can be individually implemented and later assembled into the final solution.
Dissect the code and identify each distinct concept it contains. Remember, this process should be languageagnostic and generally applicable to most modern programming languages.
Once you’ve identified these coding concepts or drills, list them out in order of increasing difficulty. Provide a brief description of each concept and why it is classified at its particular difficulty level.
Next, describe the problemsolving approach that would lead from the problem statement to the final solution. Think about how each of these coding drills contributes to the overall solution. Elucidate the stepbystep process involved in using these drills to solve the problem. Please refrain from writing any actual code; we’re focusing on understanding the process and strategy.
Targeted Drills in Python
Now that you’ve identified and ordered the coding concepts from a complex software code in the previous exercise, let’s focus on creating Pythonbased coding drills for each of those concepts.
Begin by writing a separate piece of Python code that encapsulates each identified concept. These individual drills should illustrate how to implement each concept in Python. Please ensure that these are suitable even for those with a basic understanding of Python.
In addition to the general concepts, identify and write coding drills for any problemspecific concepts that might be needed to create a solution. Describe why these drills are essential for our problem.
Once all drills have been coded, describe how these pieces can be integrated together in the right order to solve the initial problem. Each drill should contribute to building up to the final solution.
Remember, the goal is to not only to write these drills but also to ensure that they can be cohesively assembled into one comprehensive solution.
Q&A
Similar Problems
Given the problem [provide the problem], identify and list down 10 similar problems on LeetCode. These should cover similar concepts or require similar problemsolving approaches as the provided problem. Please also give a brief reason as to why you think each problem is similar to the given problem.