BehappyXiang的专栏

Broken Necklace You have a necklace of N red, white, or blue beads (3 1 2 1 2 r b b r b r r b r

Milking Cows Three farmers rise at 5 am each morning and head for the barn to milk three cows. The first farmer begins milking his cow at time 300 (measured in seconds after 5 am) and ends at time

Barn Repair It was a dark and stormy night that ripped the roof and gates off the stalls that hold Farmer John's cows. Happily, many of the cows were on vacation, so the barn was not completely ful