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question: Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. For example: Given num = 38, the proces 阅读全文
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question: Given an array of integers, every element appears twice except for one. Find that single one. my first answer(which is wrong, due to Time Li 阅读全文
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数据集的一般特性： 维度 （具有的属性数目） 稀疏性（在非对称特征数据集，一个对象大部分属性上的值为0） 分辨率（分辨率太高，模式可能看不清楚，分辨率太低可能模式不出现） 数据集类型 1 记录数据 （记录之间或数据字段之间没有明显的联系，并且每个记录（对象）有相同的属性集） 事务数据或购物篮数据 数 阅读全文
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question: Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. my wrong answer 错误点： 显示memory error 应该是运行较大数 阅读全文
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question: You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time one of you take turns to remove 1 阅读全文
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Basic notations input: x∈χ (customer application) output: y∈y (good/bad after approving credit card) target function (unknown pattern to be learned) : 阅读全文
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适用情况： 1 exists some 'underlying pattern' to be learned --so 'performance measure' can be imporoved 例：小孩哭泣，没有内在模式 2 but no programmable(easy) definitio 阅读全文