Problems
Hidden tests, real sandboxes, starter code in ten languages.
| Status | Title | Acceptance | Difficulty |
|---|---|---|---|
| Not attempted | Valid Parentheses Decide whether a string of brackets is balanced. The classic stack warm-up — print "true" or "false" for one input per line. | 100.0% | Easy |
| Not attempted | Two Sum Given an array of integers and a target, return the indices of the two numbers that add up to it. A classic warm-up for hash maps. | 0.0% | Easy |