3931. Check Adjacent Digit Differences
direct difference between adjacent digits
3932. Count K-th Roots in a Range
Binary Search on Answer
3933. Largest Local Values in a Matrix II
Simulation + Coordinate Grouping
3934. Smallest Unique Subarray
rolling hash + binary search
timelines:
0:00 q1 leetcode 3931
3:26 q2 leetcode 3932
15:34 q3 leetcode 3933
34:05 q4 leetcode 3934
