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String to Integer Conversion
Also known as: String to Integer (atoi)
String to Integer Conversion is a great reminder that off-by-one errors love strings. Interviewers love it because it reveals your rule-based parsing and your edge-case discipline. The trap is hidden edge cases—empty input, repeated characters, and boundary indexing.
Learn this pattern
String Problems
String problems rely on frequency counting, two-pointer palindrome checks, and knowing when a trie helps. The difference between brute-force O(n²) and a clean O(n) solution is usually one of these three techniques.
Meet your coaches
Talk through the problem while you code. Signed-in reps become prep memory for the next session.
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String Problems gives you a useful next rep while you are still on your phone.