Brute Force Is a Valid Strategy
When small N makes it the answer.
Brute Force Is a Valid Strategy is a free Coding Interview Prep lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Coding Interview Prep learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Brute Force Is Not Cheating
Trying every possibility is a real, respected strategy. When the input is small, the simplest answer is often the smartest one. 🙂
What Brute Force Means
A brute force solution enumerates every candidate answer and checks each one. No clever trick, just guaranteed coverage of all cases.
Why Start Here
Brute force is easy to write and easy to trust. It rarely has subtle bugs, so it is a safe first solution under contest pressure.
Small N Is Your Signal
When the constraint says N is up to 20 or 100, brute force usually fits the time limit. Tiny inputs invite simple loops.
Count Before You Code
Estimate how many candidates you will check. If that count is under roughly 10^8, a brute force pass will likely finish in time.
A Simple Example
To find a pair summing to a target in a tiny list, just test every pair. Two nested loops are perfectly fine here.
for i in range(n):
for j in range(i + 1, n):
if a[i] + a[j] == target:
found = TrueCorrectness First
A working brute force scores points now. You can always optimize later, but a slow correct answer beats a fast wrong one.
Your Reference Solution
Even when N is large, write brute force anyway as a reference. You will compare your fast solution against it during testing.
Read the Time Limit
The time limit and N together tell you the budget. If brute force fits that budget, there is no reason to overthink the problem.
When It Breaks Down
Brute force fails when the candidate count explodes, like checking all subsets of 40 items. Then you reach for smarter methods.
Decide With Confidence
Always ask one question first: how big can the input get? That single estimate tells you whether brute force is the right call.
Quick Check
You are deciding whether brute force is safe to use.
Recap
Brute force enumerates every candidate, and with small N it is correct, simple, and fast enough. Estimate the count first, then commit. 🚀
Frequently asked questions
Is the “Brute Force Is a Valid Strategy” lesson free?
Yes — the full text of “Brute Force Is a Valid Strategy” is free to read here on the web, and the Coding Interview Prep course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Coding Interview Prep course, upgrade to CoddyKit PRO.
What will I learn in “Brute Force Is a Valid Strategy”?
When small N makes it the answer. You practise Coding Interview Prep with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Coding Interview Prep?
No prior experience is required. Coding Interview Prep on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Brute Force Is a Valid Strategy” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Coding Interview Prep lesson?
Yes. Every Coding Interview Prep lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Brute Force Is a Valid Strategy
- Enumerate with itertools
- Bitmask Subset Enumeration
- Trim the Search Space Smartly