I understand the problem but not the tests
It seems like the water content halves every ~69 minutes. But the first sentence about 100% and 100 minutes are very confusing. If it is exponential decay, then water should never reach 0.
Getting the absolute index from a matrix
Given a number N, find the smallest prime P>N
area of an annulus
count any radix?
letter yes yes & letter no no
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