NOIP2014~2019
Find something inscribed.
Updated once a day
noip 2014
The Big Bang version of rock-paper-scissors:
Analog sb
Joint weight:
Noted that the graph is a tree, you can easily specify a point for the root, then find the x distance x 2 points only father's father, a brother or any of x, statistics about it.
Complexity is \ (O (n) \)