Solving problems is a programmer’s bread and butter, and everyone has their own method, I personally found 5 steps that most likely than not will help you, not only to solve problems but to do it faster and more efficiently.
1. Read the problem several times until you can explain it to someone else
This is by far, the most important step, read the problem several times, until you fully understand it, if you don’t understand it, you won’t be able to solve it. the best way to know if you understand the problem is by being able to explain it to someone else.
2. Solve the problem manually
Nothing can be automated that cannot be done manually!
Any code we write has a foundation, and it is the manual process. That being said, solve the problem manually first, that way you know exactly what you want to automate, this will save you a lot of time wasted if you just start writing code like a maniac.
Test your process with more than one input and some corner cases to validate it, pay close attention to every single step you take in your head, write it down, as each one counts.
3. Make your manual solution better
See if you can make your process better, if there is an easier way to do it or if there are some steps you can cut to simplify it (like loops). This step is very important, remember that is much easier to reconstruct your process in your head than it is in your code.
At this point you will be tempted to write some code, don’t do it yet, we have one more step to cover, I promise you it will make your final code easier to write.
4. Write pseudo code
Pseudocode is a detailed description of what a program must do, this will help you write every line of code needed in order to solve your problem.
Experienced programmers sometimes omit this step, but I can assure you no matter how experienced you are, if you write some pseudo code, the process of writing your final code will be much easier since you only have to translate each line of pseudo code into actual code.
ie. square (n)
# initialize a variable with a 'n' value # Multiply variable by it self # Return the result of that multiplication
Now we know exactly what our code is supposed to do, we have one more step… can you guess it?
5. Replace pseudo-code with real code
Here it is the fun part, now that you know for sure what your program should do, just write some code and test it. remember you can always make your code better along the way.
Lets use our square example:
def square(n) variable = n #=> initialize a variable with a 'n' value answer = variable * variable #=> Multiply variable by it self Return answer # Return the result of that multiplication end
Then we optimize it:
def square(n) n * n end # I Know! Ruby is amazing!!
No matter how complex your problem is, I assure you these 5 steps will help you solve it in less time and with fewer headaches.
Note: If your problem is too complex, divide it into small problems, it’s a technique called “Divide and conquer”.