412124 βŠ• 1 βŠ• 2 βŠ• 1 βŠ• 2
easyBlind 75

Single Number

Single Number looks straightforward, but it quietly checks whether you reach for the right lookup structure. It's a great warm-up that builds data-structure instincts without a ton of moving parts. Watch your edge cases around repeats, and be clear about what your map is storing.

Arrays & HashingBit Manipulation
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1Single Numbereasy
Based onLeetCode

Desktop required

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