MathDB
Captain jack distribute coins equally

Source: 2021 MEMO T-3

September 5, 2021
combinatoricsStrategyMEMO 2021memoinduction

Problem Statement

Let n,bn, b and cc be positive integers. A group of nn pirates wants to fairly split their treasure. The treasure consists of cnc \cdot n identical coins distributed over bnb \cdot n bags, of which at least n1n-1 bags are initially empty. Captain Jack inspects the contents of each bag and then performs a sequence of moves. In one move, he can take any number of coins from a single bag and put them into one empty bag. Prove that no matter how the coins are initially distributed, Jack can perform at most n1n-1 moves and then split the bags among the pirates such that each pirate gets bb bags and cc coins.