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Problem Jamie has recently found undirected weighted graphs with the following properties very interesting: The graph is connected and contains exactl 阅读全文
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Problem You have m = n·k wooden staves. The i-th stave has length ai. You have to assemble n barrels consisting of k staves each, you can use any k st 阅读全文
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Problem The king is left alone on the chessboard. In spite of this loneliness, he doesn't lose heart, because he has business of national importance. 阅读全文
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Problem Vasya has found a strange device. On the front panel of a device there are: a red button, a blue button and a display showing some positive in 阅读全文