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JAVAMAN is visiting Dream City and he sees a yard of gold coin trees. There aren trees in the yard. Let's call them tree 1, tree 2 ...and treen. At th 阅读全文
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Chiaki has n intervals and thei-th of them is [li,ri]. She wants to delete some intervals so that there does not exist three intervalsa,b andc such th 阅读全文
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A common typing error is to place the hands on the keyboard one row to the right of the correct position. So "Q" is typed as "W" and "J" is typed as " 阅读全文
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Given any integer 0 <= n <= 10000 not divisible by 2 or 5, some multiple of n is a number which in decimal notation is a sequence of 1's. How many dig 阅读全文
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FatMouse's SpeedTime Limit: 2 Seconds Memory Limit:65536 KB Special Judge FatMouse believes that the fatter a mouse is, the faster it runs. To disprov 阅读全文
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Fire NetTime Limit: 2 Seconds Memory Limit:65536 KB Suppose that we have a square city with straight streets. A map of a city is a square board w... 阅读全文
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Seven-Segment DisplayTime Limit: 1 Second Memory Limit:65536 KBA seven segment display, or seven segment indicator, is a form of electronic displ... 阅读全文
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Language of FatMouseTime Limit: 10 Seconds Memory Limit:32768 KBWe all know that FatMouse doesn't speak English. But now he has to be prepared si... 阅读全文
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点击打开zoj1961Let's ChatTime Limit: 1 Second Memory Limit:65536 KBACM (ACMers' Chatting Messenger) is a famous instant messaging software developed ... 阅读全文
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Consider an arbitrary sequence of integers. One can place + or - operators between integers in the sequence, thus deriving different arithmetical expr 阅读全文