### Problems by himuhasib

 Byang and Kochuripana TroubleByang is the chief software engineer at Toad Incorporated. His grandmother is planning to give him a... Moderate 82/249/767 Darth Vader and 3PO on a Tree!Did you watch Star Wars yet? No? You should in your free time. Now back to Darth Vader and 3PO. Dart... Moderate 44/55/124 Fast Co-PrimeTwo numbers A and B are called co-prime if the only common positive factor of the two numbers is 1. ... Very Easy 138/218/511 Game, Game EverywhereBinary and Ternary are playing a game. In this game, they initially choose an array with N elements.... Moderate 11/21/39 Gauss - The Great MathematicianCarl Friedrich Gauss was a great mathematician. When he was a child, his teacher told him to sum up ... Very Easy 265/271/364 Gutibaji on ChessboardLet there be a chessboard of size N×M, and only one bishop in a cell (x,y). How many cells can the b... Moderate 56/70/129 OCD Returns!This problem author has OCD (obsessive–compulsive disorder). One day his teacher gave him an array o... Moderate 52/204/521 Old Magic!You: Guess an integer number, but don't tell me. Your friend: Okay! You: Now multiply it by 3. Your ... Moderate 216/249/487 Scary Big ChessboardOur friend Alice got stuck in a big chessboard. The chessboard has N rows and N columns. Some cells ... Moderate 20/42/146 XOR on PascalLet's define F(N) as following: F(N)=(0N​)⊕(1N​)⊕(2N​)⊕⋯⊕(NN​) You are given an integer N(0≤N≤105), ... Moderate 50/68/141
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