All Questions
1,203
questions
6
votes
3
answers
1k
views
Implementation of Euler-Maruyama numerical solver
I am trying to write a python implementation of Euler-Maruyama and Milstein schemes for numerically solving stochastic differential equations. The pseudo-code for the algorithms is in the Wikipedia ...
- 397
2
votes
2
answers
158
views
Find the join of two set partitions
Two partitions of a set have a greatest lower bound (meet) and a least upper bound (join).
See here: Meets and joins in the lattice of partitions (Math SE)
The meet is easy to calculate. I am trying ...
- 150
3
votes
1
answer
66
views
Number of partitions of (a,b) into k distinct parts which sum up to (a,b)
Problem set
This is somewhat a generalization of the famous partition of integer n into k parts.
Given two integers ...
2
votes
1
answer
69
views
Clique Connect: minimum spanning tree
Problem Statement
You are given a weighted undirected graph G with N vertices, numbered 1 to N. Initially, G has no edges.
You will perform M operations to add edges to G. The i-th operation (1≤i≤M) ...
- 244
6
votes
1
answer
329
views
Codeforces: D2. Counting Is Fun (Hard Version)
The code works okay for the following problem.
Problem
An array 𝑏 of 𝑚 non-negative integers is said to be good if all the elements of 𝑏 can be made equal to 0 using the following operation some (...
- 244
14
votes
4
answers
2k
views
Create a snail matrix
Statement:
Create a script that, given an integer \$n\$, create a square matrix of dimensions \$n \times n\$ with the numbers from \$1\$ to \$n^2\$, arranged in a snail pattern.
Example:
...
- 521
4
votes
1
answer
80
views
Centre of mass based TSP solution (2)
I updated the code to a working state. My previous question. Even if this code working I wonder if I can write this code in a more efficient way. Maybe less for loops Etc.
...
- 53
4
votes
4
answers
1k
views
Creating an O(n) algorithm for an array of integers
To avoid plagiarism in my university, I am going to modify the problem.
Henry likes to jump from building to building. The heights of each building are given as a list of H numbers. We also number ...
- 41
7
votes
1
answer
251
views
Colorful Subgraph Dynamic Programming Solution and a Naive One
Given a graph \$G(V, E)\$ with vertices \$V\$ and edges \$E\$, where each vertex is associated with a single color from a set of colors \$C=\{1, 2, ..., k\}\$, we define the following problem:
Problem ...
3
votes
1
answer
95
views
Sorting songs with the ability to save and resume partial sorts
I listen to a lot of music (~4k h/y) and managing thousands of songs is a bit of a challenging.
To improve my listening experience I want to better organize my collection.
One thing I want to do is ...
- 43.4k
0
votes
1
answer
53
views
Performance optimization of traveling salesman like issue
I need help optimizing the performance of this, which is essentially similar to the traveling salesman problem, with the addition that I want to make the graph complete first, with the weight of the ...
- 109
2
votes
2
answers
164
views
Map coloring algorithm functional implementation in python
I'm an autodidact working on map coloring algorithms with backtracking, see chapter 2 of this book.
I tested this implementation with success but I'm still unsure whether it is tricking me somewhere, ...
- 23
0
votes
0
answers
72
views
Is this iterative inorder traversal algorithm well-known?
I was concerned about the approach in Morris traversal algorithm and came up with simpler solution that uses parent pointers in nodes.
The constraints were following:
Time Complexity: O(n)
Space ...
- 1
3
votes
1
answer
153
views
Pentomino solver in Python
When I was a child, I used to play Ubongo board game, recently I discovered Pentomino puzzle and I wanted to create a custom solver in python for it. Here is what I got:
...
- 31
1
vote
1
answer
87
views
HackerRank Algorithm Problem: Climbing the Leaderboard (Python)
Here is the Hackerrank problem which is related to dense ranking and below is my solution which didn't pass the time limit cases. Any better way to optimize this?
...
- 67