easyBlind 75
Counting Bits
Given a non-negative integer n Return an array where ans[i] is the count of 1's in binary of i Example: n = 2 => [0,1,1] (0='0', 1='1', 2='10') Example: n = 5 => [0,1,1,2,1,2]
Counting Bits is about turning repeated work into a reusable state instead of re-solving subproblems. It's a great warm-up that builds state-and-transition thinking without a ton of moving parts. The trap is picking a state that's too vague; keep it minimal and consistent.
Dynamic ProgrammingBit Manipulation
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1Count Binary Oneseasy
Based onLeetCode