![]() ![]() The function repeatedly calls itself until it finds a key, at which point it stops. To program this, we can write: def getKey(doll): We could use a while loop, but recursion is preferred here. How do we write a function that opens up the dolls until we find a key? But we do not know how many dolls there are. Let’s say, inside the last doll is a key. Inside that one is another slightly small doll. We open up the bigger one, and inside is a slightly smaller one. Matryoshka dolls are these cute little things: It’s a hard concept to understand if you’ve never heard of it before. Recursion is when a function calls itself. ![]() It does this with recursion.īefore we get into the rest of the article, let’s learn about recursion first. Why do we break it down to individual numbers at stage 1? Why don’t we just start from stage 2? Because while this list of numbers is even if the list was odd you would need to break it down to individual numbers to better handle it.Ī divide and conquer algorithm tries to break a problem down into as many little chunks as possible since it is easier to solve with little chunks. Then 4 numbers into 8 numbers which is our resultant. We do this by breaking the addition up into individual numbers. We first divide the problem into 8 equal sub-problems. The order doesn’t matter, as long as we turn this one long equation into many smaller equations. We take the equation “3 + 6 + 2 + 4” and cut it down into the smallest set of equations, which is. ![]() The rather small example below illustrates this. (Don’t worry, I hate maths too).ĭivide and conquer is where you divide a large problem up into many smaller, much easier to solve problems. The final will get into the mathematical core of divide and conquer techniques. This article is designed to be read by someone with very little programming knowledge. Don’t worry if you have zero experience or knowledge on the topic. Before worrying about optimising for loops or if statements try to attack your problem from a different angle.ĭivide and Conquer is one way to attack a problem from a different angle. Most computers have over 1 core, with the ability to support multiple threads. Often I’ll hear about how you can optimise a for loop to be faster or how switch statements are faster than if statements. 13 min read Photo by Sergei Tokarev / Unsplash. ![]()
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