2008 ToT Spring Junior A P5 99 girls in a circle, each with a candy
Source:
March 7, 2020
combinatorics
Problem Statement
Standing in a circle are girls, each with a candy. In each move, each girl gives her candy to either neighbour. If a girl receives two candies in the same move, she eats one of them. What is the minimum number of moves after which only one candy remains?