Random Permutation
Problem Given an array of integers, and an integer index \(k\), randomly permute the array up to index \(k\). Input \(A\) - Array of integers \(k\ »
Python String Tricks - Performance considerations
If a string is changed to become bigger, consider trying to find the maximum size of the final string early on in a quick pass (strive »
Cyclic Permutation
This is an array/list trick that saves about O(n) in space complexity by taking advantage of a given array with integers representing indices. For »
Counting the path of sums
Description Given a binary tree with nodes containing integer values (positive or negative), how can you count up all the paths that equal to some target »
Recursive multiply function in Python using + and binary shifts
Here is one way to do an arithmetic multiply on two positive integers only using <<, >>, and +, without using the * or / operators. The »