Learn how to read, break down, and approach any coding problem systematically.
Before writing code, top candidates spend time understanding the problem, identifying constraints, thinking of examples and edge cases, and choosing the right approach. A structured problem-solving process prevents wasted time and makes your thought process clear to interviewers.
N/A ā conceptual topic
N/A ā conceptual topic
Learn the core patterns in this topic. Each block explains when to use the pattern, the intuition behind it, and a compact code example.
identify exact input/output.
"return indices" vs "return values"
array size, value range, can input be empty or negative?
trace nums=[2,7,11], target=9 ā output [0,1]
empty array [], single element [x], all same [5,5,5], negatives [-1,2]
write O(nĀ²) nested loop solution, then optimize
identify bottleneck, apply pattern: sort/hash/two-pointer/binary search
step through your code manually before submitting
in interviews, think aloud so the interviewer follows your reasoning