Byang and Kochuripana Trouble Byang is the chief software engineer at Toad Incorporated. His grandmother is planning to give him a... |

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... |

Fast Co-Prime Two numbers A and B are called co-prime if the only common positive factor of the two numbers is 1. ... |

Game, Game Everywhere Binary and Ternary are playing a game. In this game, they initially choose an array with N elements.... |

Gauss - The Great Mathematician Carl Friedrich Gauss was a great mathematician. When he was a child, his teacher told him to sum up ...
Very Easy
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Gutibaji on Chessboard Let there be a chessboard of size N×M, and only one bishop in a cell (x,y). How many cells can the b... |

OCD Returns! This problem author has OCD (obsessive–compulsive disorder). One day his teacher gave him an array o... |

Old Magic! You: Guess an integer number, but don't tell me. Your friend: Okay! You: Now multiply it by 3. Your ... |

Scary Big Chessboard Our friend Alice got stuck in a big chessboard. The chessboard has N rows and N columns. Some cells ... |

XOR on Pascal Let'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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