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Stealing Harry Potter's Precious HDU - 4771 　Harry Potter has some precious. For example, his invisible robe, his wand and his owl. When Hogwarts school is in holiday, Harry Potter has to go back ...

Tunnels HDU - 4856 Bob is travelling in Xi’an. He finds many secret tunnels beneath the city. In his eyes, the city is a grid. He can’t enter a grid with a barrier. In one minute, he can move into...

D - Kefa and Dishes CodeForces - 580D When Kefa came to the restaurant and sat at a table, the waiter immediately brought him the menu. There werendishes. Kefa knows that he needs exactlymdish...