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).
Test for balanced parentheses
letter yes yes & letter no no
"Low : High - Low : High - Turn around " -- Create a subindices vector
Calculate the area of a triangle between three points
Rank of magic square (for beginners)
Add more zeros
Two functions (to be sure)
Generalised Hamming Number
Can you beat the lottery again (for hardcore coder) ?
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