NZ-NZMO 2022 Problem 4
On a table, there is an empty bag and a chessboard containing exactly one token on each square. Next to the table is a large pile that contains an unlimited supply of tokens. Using only the following types of moves what is the maximum possible number of tokens that can be in the bag?
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Type 1: Choose a non-empty square on the chessboard that is not in the rightmost column. Take a token from this square and place it, along with one token from the pile, on the square immediately to its right.
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Type 2: Choose a non-empty square on the chessboard that is not in the bottommost row. Take a token from this square and place it, along with one token from the pile, on the square immediately below it.
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Type 3: Choose two adjacent non-empty squares. Remove a token from each and put them both into the bag.
Dataset text NuminaMath olympiads. Quoted with source.
Solutions
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