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沙发

楼主 |
发表于 2011-1-28 14:16:29
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大家帮忙看看这题: the integer N can be expressed in this way: the sum of numbers made by a consecutive list 1 2 3 4 5 (note the word consecutive, it means the order should be 12345, not 13245 or 23415 etc), and you should put 2 plus sign between them, for example, 12+34+5 = 51 (warn: the N does not need to be a number consisted of 12345, in the example, 1 appear twice!), is N even? 1) N is 3 digit 2) one of the two plus sign is between 1 and 2 |
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