Special subset sums: meta-testing Let S(A) represent the sum of elements in set A of size n. We shall call it a special sum set if for any two non-empty disjoint subsets, B and C, the following properties are true: S(B) ≠ S(C); that is, sums of subse…

Given a non-empty array containing only positive integers, find if the array can be partitioned into two subsets such that the sum of elements in both subsets is equal. Note: Both the array size and each of the array element will not exceed 100. Exam…

Given a set of distinct positive integers, find the largest subset such that every pair (Si, Sj) of elements in this subset satisfies: Si % Sj = 0 or Sj % Si = 0. If there are multiple solutions, return any subset is fine. Example 1: nums: [1,2,3] Re…

题目描述 对于从1到N (1 <= N <= 39) 的连续整数集合,能划分成两个子集合,且保证每个集合的数字和是相等的.举个例子,如果N=3,对于{1,2,3}能划分成两个子集合,每个子集合的所有数字和是相等的: {3} 和 {1,2} 这是唯一一种分法(交换集合位置被认为是同一种划分方案,因此不会增加划分方案总数) 如果N=7,有四种方法能划分集合{1,2,3,4,5,6,7},每一种分法的子集合各数字和是相等的: {1,6,7} 和 {2,3,4,5} {注 1+6+7=2+3+4+5}…

Very nice DP problem. The key fact of a mutual-divisible subset: if a new number n, is divisible with the largest number m within a mutual-divisible set s, s U {n} is also a mutal-divisible subset. class Solution { public: vector<int> largestDivisib…

N (1 <= N <= 39),问有多少种把1到N划分为两个集合的方法使得两个集合的和相等. 如果总和为奇数,那么就是0种划分方案.否则用dp做. dp[i][j]表示前 i 个数划分到一个集合里,和为j的方法数. dp[i][j]=dp[i-1][j]+dp[i][j-i] n 为 39 时,1 到 39 的和为 780,枚举 j 的时候枚举到 s/2,最后输出dp[n][s/2]/2. http://train.usaco.org/usacoprob2?a=z5hb7MFUmsX&…

Given a non-empty array containing only positive integers, find if the array can be partitioned into two subsets such that the sum of elements in both subsets is equal. Note: Each of the array element will not exceed 100. The array size will not exce…

Given a set of distinct positive integers, find the largest subset such that every pair (Si, Sj) of elements in this subset satisfies: Si % Sj = 0 or Sj % Si = 0. If there are multiple solutions, return any subset is fine. Example 1: nums: [1,2,3] Re…

http://dev.mysql.com/doc/refman/5.7/en/index-btree-hash.html Hash Index Characteristics Hash indexes have somewhat different characteristics from those just discussed: They are used only for equality comparisons that use the = or <=> operators (but…

制图工作中,大量密集点显示是最常遇到的问题.其特点是分布可能不均匀.数据点比较密集,容易造成空间上的重叠,影响制图美观.那么,如果美观而详细的显示制图呢? Subset Features(子集要素)工具是 ArcGIS 地统计分析模块的一个工具,该工具可将数据按照百分比进行抽稀,生成两个结果数据集,一个是抽稀后保留的数据,另一个是互补的那一部分数据. 实现原理 其原理是将数据分成两个子集.子集 1 将有 L 个要素,子集 2 将有 N - L 个要素(N 表示原始数据集中的要素数量).要素的分割…