Interview prep, without the usual noise.
Turn patterns into confidence.
LiteCode helps you practice interview problems, sharpen core patterns, and build the kind of consistency that carries into real rounds.
Built for steady practice
Work through problems, run your code, and learn from each submission without breaking your flow.
litecode.app/problem
Problem
Longest Substring Without Repeating Characters
Find the length of the longest substring without repeating characters.
int left = 0;
track the last seen index
expand, then tighten the window
Run0.6s
Accepted after one quick revision.