In test 1 why the iron in x(4,1) did not moved to the top !?
x(4,1) is equidistant to both upper and lower magnet, that's why...
Rounding off numbers to n decimals
5 Prime Numbers
Van Eck's Sequence's nth member
all possible subsets of set
Graph Algorithms - 2 : Chromatic Number
Beauty of Parentheses
longest common substring : Skipped character version
birthday on same day of week
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