Hey! Hope you had a great day so far! 今天想和大家讨论的是一道我从这学期cs的期末考试得到灵感的题:Get 24 Poker Game.说到 Get 24 Poker Game,也就是我们通常说的凑24点,大家可能都比较熟悉.但是因为这个游戏有很多变种,我们还是来简单说一下游戏的规则.老规矩,上Wikipedia: The 24 Game is an arithmetical card game in which the objective is to fi…
Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The same repeated number may be chosen from C unlimited number of times. Note: All numbers (in…
39. Combination Sum Combination,组合问题用DFS罗列全部的答案. class Solution { public List<List<Integer>> combinationSum(int[] candidates, int target) { List<List<Integer>> res = new ArrayList<>(); if(candidates == null || candidates.leng…
Combination Sum Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The same repeated number may be chosen from C unlimited number of times. Note: All numbers (includi…
Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. Example: Input: n = 4, k = 2 Output: [ [2,4], [3,4], [2,3], [1,2], [1,3], [1,4], ] class Solution { List<List<Integer>> res = new ArrayList<>(); pu…
罗列出从n中取k个数的组合数组. 首先,求C(n,k)这个实现,很粗糙,溢出也不考虑,好的方法也不考虑.笨蛋.心乱,上来就写.. 另外,发现在递归中,不能申请太大的数组?貌似不是这个问题,是我自己越界了. /** * Return an array of arrays of size *returnSize. * The sizes of the arrays are returned as *columnSizes array. * Note: Both returned array and…
笛卡尔积:itertools.product(*iterables[, repeat]) import itertools for i in itertools.product('BCDEF', repeat = 2): print(''.join(i),end=",") print('\n') # 输出 BB BC BD BE BF CB CC CD CE CF DB DC DD DE DF EB EC ED EE EF FB FC FD FE FF 两个元组进行笛卡尔积: impo…