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"原题:885. Spiral Matrix III" On a 2 dimensional grid with R rows and C columns, we start at (r0, c0) facing east. Here, the north west corner of the gr 阅读全文
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原题: "672. Bulb Switcher II" There is a room with n lights which are turned on initially and 4 buttons on the wall. After performing exactly m unknown 阅读全文
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题目大意 "Bulb Switcher" There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third rou 阅读全文
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原题: "728.Self Dividing Numbers" A self dividing number is a number that is divisible by every digit it contains. For example, 128 is a self dividing n 阅读全文