One of the most important steps in problem solving is understanding the constraints.
Many developers start coding immediately after reading a problem.
Strong problem solvers analyze the constraints first.
Constraints help determine:
- acceptable time complexity
- possible data structures
- whether brute force is feasible
- whether optimization is required
Consider a problem with input size n.
If n ≤ 10³
A brute-force approach with time complexity O(n²) might work.
If n ≤ 10⁵
You likely need a more optimized solution such as O(n) or O(n log n).
Understanding this early prevents wasted effort on inefficient solutions.
Before writing code, ask:
- What are the input limits?
- What time complexity is acceptable?
- Which data structure fits the problem?
- Are there edge cases that may break the solution?
Coding is usually the final step in solving a problem.
Understanding constraints, data relationships, and trade-offs often reveals the correct approach.
Good engineers don't start with code.
They start with constraints.
Engineering thinking for developers.
Created by Ishwar Chandra Tiwari