LeetCode 233: Number of Digit One
A detailed explanation of counting how many times digit one appears from 0 to n using positional digit analysis.
Tag
Digit-Dp
4 notes
LeetCode 902: Numbers At Most N Given Digit Set
A clear explanation of counting numbers less than or equal to N using digit-by-digit construction and combinatorics.
LeetCode 788: Rotated Digits
A clear explanation of counting good numbers after rotating every digit by 180 degrees.
LeetCode 600: Non-negative Integers without Consecutive Ones
A clear digit dynamic programming solution for counting numbers whose binary representation does not contain consecutive ones.