All Questions
15 questions
5votes
3answers
961views
LeetCode 678: Valid Parenthesis String, Recursion memoization to DP
How can the following recursion + memoization code be converted into a tabulation format dynamic programming solution? The code is working, but I want to improve it. The challenge I am facing is ...
3votes
2answers
2kviews
LeetCode: Longest String Chain (Java)
For the question, I had a pretty messy solution so I would like some advice on how to better use Java to make the code a bit cleaner. Also, a semi-hack that I did that I'm not proud of is checking if ...
- 85
5votes
2answers
124views
Calculate the rates at which users get stuck at each stage
I completed an algorithm problem just as a personal study, and I can't help but feel like my solution is a bit needlessly complicated, although I can't figure out a better way to do it. Here's the ...
- 151
3votes
2answers
832views
Optimal burger-eating challenge
Little history to give context to the problem: The Krusty-Burgers Homer Simpson is a smart guy who likes to eat Krusty-Burgers, and it takes m minutes for Homer ...
- 401
0votes
2answers
506views
Making Anagram Problem Implementation
Problem Statement Alice is taking a cryptography class and finding anagrams to be very useful. We consider two strings to be anagrams of each other if the first string's letters can be rearranged to ...
3votes
1answer
10kviews
Solving maze problem with backtracking solution using stack
I solved the maze backtracking question using a stack however could not find any other solution like that anywhere (to validate my solution is actually a valid one). The problem statement is as ...
- 143
3votes
2answers
4kviews
"What is the fastest solution for finding the maximum sum of a subarray?"
Question Given an array, find the longest continuous sub-array which has maximum sum. My Approach First, I solved this problem using dynamic programming which effectively solved the problem in \$O(...
- 303
0votes
1answer
303views
Count number of ways to achieve a sum [closed]
The Question : Utkarsh being a very talkative child, was scolded by his teacher multiple times. One day, the teacher became very angry and decided to give him a very rigorous punishment. He made ...
- 231
4votes
1answer
274views
Assembly Line Scheduling challenge, solved using TDD
I am new to Test Driven Development and currently practicing it with some problem statement. Following is an Assembly Line Problem statement I solved using TDD approach in java. Please provide me some ...
8votes
5answers
2kviews
Repeatedly partitioning an array equally as far as possible
I solved HackerRank Nikita and the Game. The implementation is correct as program passes all test cases. Nikita just came up with a new array game. The rules are as follows: Initially, ...
12votes
2answers
640views
Dynamic Programming: Fibonacci-like recurrence relation
This is a problem from my Introduction to Algorithms textbook. Consider the infinite sequence of numbers An|n>0 = (1,1,3,4,8,11,...) defined recursively as follows. $$ A_n = \left\{\begin{aligned} &...
- 9,839
4votes
2answers
6kviews
Finding all the subsets in an array of integers that sum to a given target
Problem Statement: Given an Array if ints, Find out all the subsets in the Array that sum to a given target value. Example: If the input array is: ...
- 872
10votes
1answer
4kviews
Project Euler #14 -- longest Collatz sequence
I was reading this question and realized that I didn't know Python well enough to critique the algorithm. So I wrote a Java solution instead, which is inappropriate for that question. Since there's ...
- 6,974
2votes
2answers
470views
Calculating the number of prime numbers to solve the puzzle
How can the following program execution time improved? I have used dynamic programming in both "recursive" as well as "prime" function, but I'm not getting the efficient execution time. There is a ...
- 63
11votes
3answers
1kviews
Optimizing "Herd Sums" problem using dynamic programming
I'm trying to solve a practice problem and all is well except for the last 2 inputs my solution is too slow. Just one loop is slowing it down I think. Herd Sums Execution Time Limit: 2 seconds ...
