output standard output A tree is an undirected graph with exactly one simple path between each pair of vertices. We call a set of simple paths k" data-mce-tabindex="0">kk-valid if each vertex of the tree belongs to no more than one of these paths (including endpoints) and each path consists
Problem DescriptionPeople in Silverland use square coins. Not only they have square shapes but also their values are square numbers. Coins with values of all square numbers up to 289 (=17^2), i.e., 1-credit coins, 4-credit coins, 9-credit coins, ..., and 289-credit coins, are available in Silverland
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