All Questions
5
questions
2
votes
2
answers
999
views
Generating all permutations of 1 digit, 2 equal letters and 2 different letters efficiently
I created a function that generates all the combinations of 1 digit, 2 equal letters and 2 different letters.
I reduced the numbers and letters to make it more easy to calculate:
...
- 237
7
votes
2
answers
222
views
4 distinct integers, whose reciprocals sum up to 1
I wrote the following short python program to solve a math puzzle, which asked for all the 4-tuples of distinct natural numbers whose reciprocals sum up to 1.
...
- 171
4
votes
1
answer
1k
views
Permutation index Python
Here is my Python code for finding the permutation index of a given digits and a target number. And by permutation index I mean, for example, given digits ...
- 325
7
votes
5
answers
2k
views
Improving efficiency of Project Euler 185 (16-place Mastermind)
This a solution for Project Euler Problem 185. It works fine for the example but slow for the problem statement. How can I improve its speed and efficiency?
...
- 543
6
votes
2
answers
409
views
Central Delannoy numbers
I am solving this problem on SPOJ Upper Right King (Hard):
There is a king in the lower left corner of the \$ n \times n \$ chess board. The king can move one step right, one step up or one step up-...
- 61