Repeat Evolution

20. Valid Parentheses

2 attempts over 1270 days. This page compares how the solution size, thinking trace, and stuck markers changed between posts.

2 attempts

1270 days apart

n/a line delta

3 best lines

0 thought lines

0 stuck attempts

Repeat lab Latest post Back to library LeetCode

Timeline Shape

Bars are normalized inside this problem, so the widest bar is the largest attempt in that metric.

Each card is a daily post, with local deltas from the previous attempt.

Attempt 1 · 10.04.2023

medium

Solution n/a

Thoughts 0 lines

unknown

use HashMap to check matching bracket.

Full post LeetCode

Attempt 2 · 01.10.2026

easy

Solution 3 lines

Thoughts 0 lines

tiny kotlin

1270 days later lines n/a chars n/a thoughts 0

Are braces valid

Full post LeetCode

Compact generated readout from the first and latest attempts.

Solution size unmeasured

No complete first-to-latest code metric.

Thinking trace steady

0 lines between first and latest attempt.

Best snapshot 01.10.2026

3 lines, 135 chars.

Honesty markers 0 stuck

0 stuck attempts, 0 one-liner attempts.