A good opportunity to implement a hashtable: lots of collisions without it.
A re-post of Solution 1137054, because that one doesn't appear in the list of solutions, for some reason (I'm not sure why).
Find the longest sequence of 1's in a binary sequence.
frame of the matrix
Rounding off numbers to n decimals
Without the French accent please!
Numbers spiral diagonals (Part 2)
Add more zeros
I want to know everything!
Find Missing Number
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