Questions tagged [dynamic-programming]
Dynamic programming is an algorithmic technique for efficiently solving problems with a recursive structure containing many overlapping subproblems.
298
questions
1
vote
0
answers
51
views
3ph 2l inverter simulation with SPWM
Here is a code for a simple model of three phase two level inverter with constant DC voltage source and three phase RL load.
...
- 21
1
vote
3
answers
94
views
Another ATMs cash-out (denomination) algorithm in Java
Related to this question and this answer, I would like to have a second review from you on a modified version.
The problem I tried to solve
Some kind of "Minimum count of numbers required from ...
- 448
1
vote
5
answers
246
views
Sum of bitwise XOR of each subarray weighted by length
here is the problem statement
You are given an array a of length n consisting of non-negative integers.
You have to calculate the value of \$\sum_{l=1}^n \sum_{r=l}^n f(l,r)\cdot (r - l + 1)\$ where \...
1
vote
0
answers
60
views
Wrapping an ExpandoObject within a SafeExpandoObject
I've written code to deserialize a JSON into an ExpandoObject. The only problem with the ExpandoObject is that if you try to access a member which doesn't exist, it ...
- 111
0
votes
1
answer
216
views
Leetcode: 2327. Number of People Aware of a Secret
On day 1, one person discovers a secret.
You are given an integer delay, which means that each person will share the secret with a new person every day, starting from delay days after discovering the ...
- 1
4
votes
2
answers
108
views
Find largest sum not involving consecutive values
There is a question to basically find the largest sum in an array, such that no two elements are chosen adjacent to each other. The concept is to recursively calculate the sum, while considering and ...
- 43
2
votes
1
answer
174
views
k-dice Ways to get a target value
I'm trying to solve the following problem:
You have a k-dice.
A k-dice is a dice which have k-faces and each face have value written from 1 to k.
Eg. A 6-dice is the normal dice we use while playing ...
- 212
0
votes
1
answer
81
views
Longest (more or less) ideal subsequence
An ideal subsequence is a subsequence of a string, where the distance between adjacent characters in the subsequence is bounded by a maximum, i.e. \$\lvert c[i] - c[i\pm 1] \rvert \leq k\$
Example:
...
- 1
1
vote
2
answers
100
views
Making my DP algorithm faster - longest palindromic substring
The following code is my solution to a LeetCode question - find the longest palindromic substring. My code is 100% correct, it passed once but it took too long, and in most of the reruns I hit a "...
- 113
1
vote
1
answer
472
views
Leetcode 55. Jump Game solution
I was working on Jump Game problem on leetcode
Question
You are given an integer array nums. You are initially positioned at the array's first index, and each element in the array represents your ...
- 189
1
vote
1
answer
722
views
Re-order table columns in HTML dynamically with Javascript
I've a table in HTML looks like this:
Subjects
n1
n2
n3
subject1
10
0
0
subject2
0
5
20
...
3
votes
1
answer
84
views
Segmentation of list to minimize the largest sum
I have written the following code for diving a list 'seq' into 'k' segments such that the maximum sum of each segment is minimized. I have used dynamic programming to solve this problem. But my class &...
2
votes
1
answer
80
views
Find all non-crossing tuples which has the same content with a given tableau
Let T be a semistandard Young tableau of rectangular shape. For example,
[[1,2,4],[3,5,6]]
is such a tableau, where [1,2,4] and [3,5,6] are columns. All non-...
- 183
2
votes
1
answer
374
views
make html table in sync with javascript array
I have an array of users containing user name with their rules on my practice project
I have generated a table in HTML from that array in JS, So I can
change the ...
3
votes
1
answer
245
views
Longest Palindromic Substring | Python Code Giving TLE
Problem Statement
Given a string s , return the longest palindromic substring in s.
Constraints
...
- 138
2
votes
1
answer
107
views
Coin partitions
I am looking to obtain the partitions of coins that sum to a target amount
So I tried search online, but every single website loves to use this problem to show the benefits of dynamic programming. ...
- 5,705
1
vote
1
answer
69
views
Longest Increasing Subsequence of Rectangles
Background
I was looking at some programming Olympiads the other day, and I found this ACM-ICPC Ukraine 2013 pdf.
The part I am working on is Problem D, which consist of finding out how many rectangle ...
- 111
5
votes
1
answer
60
views
RodCutting and learning Dynamic Programming
I tried to learn dynamic programming going from recursion to memoized version with the RodCutting problem: Returns the best obtainable price for a rod of length n and price[] as prices of different ...
- 293
2
votes
0
answers
127
views
Bellman-Ford algorithm implementation
I have used an adjacency list to represent the graph.
This implementation is based on the procedure given in the book 'Introduction to Algorithms'.
...
- 311
2
votes
2
answers
2k
views
HackerRank: Sam and substrings | How can dynamic programming be used in my code?
Given a number as a string, no leading zeros, determine the sum of all integer values of substrings of the string.
Given an integer as a string, sum all of its substrings cast as integers. As the ...
- 147
1
vote
2
answers
133
views
3
votes
3
answers
700
views
Find maximum value of recursively-defined "fusc" function
I've been trying this question from SPOJ, which asks for the user to enter a number n, and they will receive a maximum fusc value that lies in between 0 to ...
3
votes
1
answer
748
views
Divide array into three disjoint sets with equal sum
Problem definition : Array partition problem
Given an array of positive integers, divide it into three disjoint subsets having equal sum. These disjoint sets cover the complete array.
Example
Input: [...
- 389
1
vote
1
answer
194
views
Target Sum array using Dynamic Programming
I'm learning Dynamic Programming and trying to solve this Target Sum array problem. I've to find an array of integers that sums to a given target sum using the integers of given input array. I've used ...
- 379
3
votes
1
answer
2k
views
Recursive solution of ordered Coin Combinations II (CSES)
Question Link
Consider a money system consisting of n coins. Each coin has a positive integer value. Your task is to calculate the number of distinct ordered ways you can produce a money sum x using ...
- 131
2
votes
1
answer
114
views
Find ALL duplicate subtrees. using recursion
This is just a practice exercise, I'm trying to understand dynamic programming as deeply as I can. I solved this using recursion, though I am not sure if it will always work. If anyone could tell me a ...
- 121
0
votes
0
answers
109
views
Better Approach for the House Robbery Problem (LeetCode 198)?
The problem states that you have to rob the maximum money stashed in the houses but you cannot rob two adjacent houses. array[i] denotes the money in the (i)th house. I got the following code ...
- 129
1
vote
2
answers
328
views
Leetcode 377. Combination Sum IV Javascript Memoization attempt
Problem Statement
...
1
vote
1
answer
6k
views
Patch a JSON object using dynamic / ExpandoObject with System.Text.Json
Background
Recently, I was making some updates to an "older" library that would handle PATCH-style modifications to an object that is persisted in a JSON format on our document-storage ...
- 1,013
0
votes
3
answers
429
views
Calculate sum of a substring
I try to solve some old Codeforces questions. The problem is;
Petya once wrote a sad love song and shared it to Vasya. The song is a
string consisting of lowercase English letters. Vasya made up q
...
- 177
3
votes
1
answer
197
views
Killing a Hydra - Overengineered
Background
This question is inspired by the question: Killing a hydra, and my response therein. I will restate the problem at hand in full so that this question is fully self contained
You can only ...
- 5,705
5
votes
1
answer
154
views
K Inverse Pairs Array - Brute Force
For an integer array nums, an inverse pair is a pair of integers [i, j] where ...
- 195
3
votes
1
answer
106
views
Haskell implementation of Needleman-Wunsch
The code below is a Haskell implementation of Needleman-Wunsch algorithm for sequence alignment (and string edit distance). It's an experiment in trying to closely imitate the dynamic programming ...
- 33
1
vote
2
answers
119
views
I want reduce the time complexity for this ladder problem to find the minimum ladders required
I was trying to attempt below given challenge. I tried multiple ways to solve the problem but none of them were good enough to pass the time limit. Please advise if you have any idea to improve on ...
- 13
4
votes
2
answers
95
views
Unique Paths II, dynamic programming problem, O(n^2) time, O(n^2) space
This is based on this leetcode question. I get the correct answer, but I know it could be much, much cleaner. I also know there is supposed to be an O(n) space solution, but I'm not sure how to ...
- 309
3
votes
1
answer
4k
views
Count the number of distinct subarrays
I want to determine the number of distinct subarrays that can form having at most a given number of odd elements. Two subarrays are distinct if they differ at even one position. The subarray is a ...
- 31
2
votes
1
answer
117
views
Haskell Dynamic Programming on a Tree
Here is my shot at Homework 8 of CIS-194 (from Spring '13). The problem is about a hierarchy of employees at a company (a tree), each node being of type Employee, ...
- 125
3
votes
1
answer
288
views
Efficiently calculate value of Pascal's Triangle using memoization and recursion
So reading about functional programming, applications to dynamic programming, and learning Scala. I figured I would try it out with a popular example, Pascal's Triangle, tests against known values ...
- 133
1
vote
0
answers
64
views
LeetCode: range sum query mutable c#
https://leetcode.com/problems/range-sum-query-mutable/
I am trying to solve this question using dynamic programming.
I guess the guys in leetcode want to limit us to use segment tree or one of the ...
- 5,321
-1
votes
1
answer
284
views
Grid Dynamic Programming
atcoder.jp Problem Statement:
There is a grid with H horizontal rows and W vertical columns. Let (i,j) denote the square at the ...
4
votes
1
answer
161
views
Searching for an idiomatic Rust implementation of Minimum Edit Distance (LeetCode #72)
I am solving LeetCode Dynamic Programming challenges (this one is #72, at https://leetcode.com/problems/edit-distance).
Here below, I've implemented a Rust solution for the minimum edit distance ...
- 143
0
votes
1
answer
72
views
Find a sum using just two different digits
The problem statement was pretty easy and I was able to run half of the test cases, but some of the test cases in the end gave me the error of memory limit reached. What can I do here to improve the ...
- 13
1
vote
0
answers
238
views
Divide a set into subset with some constraints
Note - I am not sure whether this question belongs to stackoverflow or CSE stackexchange or here
Problem:
Given a list Lconsisting of not necessarily unique non-...
- 161
3
votes
0
answers
122
views
C++ - Longest Common Subsequence
Link to the Problem
Here is my code to compute the length of the longest common subsequence of two integer arrays arr[] and brr[]...
- 31
3
votes
0
answers
286
views
LeetCode: Stone Game C#
https://leetcode.com/problems/stone-game/
Alex and Lee play a game with piles of stones. There are an even
number of piles arranged in a row, and each pile has a positive
integer number of stones ...
- 5,321
1
vote
1
answer
1k
views
Code A Primitive Calculator ( x3,x2,+1) Using Dynamic programming [closed]
Question -You are given a primitive calculator that can perform the following three operations with the current number 𝑥: multiply 𝑥 by 2, multiply 𝑥 by 3, or add 1 to 𝑥. Your goal is given ...
- 21
0
votes
1
answer
325
views
Generate unique string permutations recursively
🧩 Objective
Write a recursive method for generating all permutations of an input string. Return them as a set.
See: Recursive String Permutations - Interview Cake
🔎 Questions
1: How does the ...
- 239
9
votes
1
answer
2k
views
LeetCode on Longest Palindromic Substring in Python
This is a programming question from LeetCode:
Given a string s, return the longest palindromic substring in s.
Example 1:
Input: s = "babad" Output: "bab" Note: "aba" is ...
user5235
2
votes
1
answer
71
views
Why below recursive DP solution is so slow? (Leetcode Q# 123 - Best Time to Buy and Sell Stock III)
This is regarding leetcode Question# 123. I have solved the question (code below) but the solution is showing "Your runtime beats 5.89 % of cpp submissions."? Is there any additional ...
- 121
3
votes
0
answers
646
views
Split money into every possible combination of coin denominations
Background and objective of the code
Based on this Dev.to challenge, I wrote the Python code below (TIO link also available).
The task was to return the least number of coins in a given denomination ...
- 458