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LeetCode-90 Subsets II
Given a collection of integers that might contain duplicates,S, return all possible subsets.Note:Elements in a subset must be in non-descending order....
分类:其他好文   时间:2015-02-19 20:42:09    阅读次数:222
LeetCode-78 Subsets
Given a set of distinct integers,S, return all possible subsets.Note:Elements in a subset must be in non-descending order.The solution set must not co...
分类:其他好文   时间:2015-02-18 00:59:31    阅读次数:172
leetcode[90]Subsets II
Given a collection of integers that might contain duplicates,S, return all possible subsets.Note:Elements in a subset must be in non-descending order....
分类:其他好文   时间:2015-02-09 15:39:14    阅读次数:131
leetcode[78]Subsets
Given a set of distinct integers,S, return all possible subsets.Note:Elements in a subset must be in non-descending order.The solution set must not co...
分类:其他好文   时间:2015-02-09 15:26:35    阅读次数:122
Leetcode#90 Subsets II
原题地址跟Subsets(参见这篇文章)类似。但因为有重复元素,所以要考虑去重问题。什么情况下会出现重复呢?比如S = {5, 5, 5},如果要选1个5,一共有C(3,1)=3种选法,即100, 010, 001,这三种情况在集合的角度看是重复的情况。如果要选2个5,共有C(3,2)=3种选法,即...
分类:其他好文   时间:2015-01-29 14:17:51    阅读次数:160
Leetcode#78 Subsets
原题地址基本DFS,对于每个元素,要么选,要么不选。记得先排序,因为结果集的数字要从小到大出现。代码: 1 vector > res; 2 3 void dfs(vector &S, vector ans, int pos) { 4 if (pos == S.size()) { 5 r...
分类:其他好文   时间:2015-01-28 17:26:58    阅读次数:270
【机器学习中的数学】从西格玛代数、测度空间到随机变量
σ代数 令X是一个样本空间(sample space)Ω的所有子集(subsets)的集合的一个子集,那么集合X被称为σ代数(σ-algebra)又叫σ域(σ-field)。 它有以下几个性质: (1)Φ∈X;(Φ为空集) (2)若A∈X,则A的补集A^c∈X; (3)若Ai∈X(i=1,2,…)则∪Ai∈X; 可测空间 Ω是任意集合,而X是把Ω中的极端情况去...
分类:其他好文   时间:2015-01-20 12:04:24    阅读次数:143
LeetCode Subsets II
Given a collection of integers that might contain duplicates,S, return all possible subsets.Note:Elements in a subset must be in non-descending order....
分类:其他好文   时间:2015-01-16 01:05:01    阅读次数:188
LeetCode--Subsets II
Given a collection of integers that might contain duplicates, S, return all possible subsets. Note: Elements in a subset must be in non-descending order.The solution set must not contain dupli...
分类:其他好文   时间:2015-01-13 17:45:51    阅读次数:139
LeetCode--Subsets
Given a set of distinct integers, S, return all possible subsets. Note: Elements in a subset must be in non-descending order.The solution set must not contain duplicate subsets. For exa...
分类:其他好文   时间:2015-01-13 10:35:09    阅读次数:181
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