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Problem Description The 15-puzzle has been around for over 100 years; even if you don't know it by that name, you've seen it. It is constructed with 1 阅读全文
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Problem Description Suppose that you are an admiral of a famous naval troop. Our naval forces have got 21 battleships. There are 6 types of battleship 阅读全文
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Problem Description The students of the HEU are maneuvering for their military training. The red army and the blue army are at war today. The blue arm 阅读全文
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Problem Description George took sticks of the same length and cut them randomly until all parts became at most 50 units long. Now he wants to return s 阅读全文
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Problem Description The twenty-first century is a biology-technology developing century. We know that a gene is made of DNA. The nucleotide bases from 阅读全文
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Problem Description Last night, little erriyue had a horrible nightmare. He dreamed that he and his girl friend were trapped in a big maze separately. 阅读全文