题目链接 考虑1,5,5,5这种情况,有:5*(5-1/5)=24所以除法必须自定义运算才行. class Num: def __init__(self,up,down=1): self.up=up self.down=down def gcd(self,x,y): return x if y==0 else self.gcd(y,x%y) def simple(self): if self.up==0: return d=self.gcd(self.up,self.down) self.up/…

You have 4 cards each containing a number from 1 to 9. You need to judge whether they could operated through *, /, +, -, (, )to get the value of 24. Example 1: Input: [4, 1, 8, 7] Output: True Explanation: (8-4) * (7-1) = 24 Example 2: Input: [1, 2,…

You have 4 cards each containing a number from 1 to 9. You need to judge whether they could operated through *, /, +, -, (, ) to get the value of 24. Example 1: Input: [4, 1, 8, 7] Output: True Explanation: (8-4) * (7-1) = 24 Example 2: Input: [1, 2,…

You have 4 cards each containing a number from 1 to 9. You need to judge whether they could operated through *, /, +, -, (, )to get the value of 24. Example 1: Input: [4, 1, 8, 7] Output: True Explanation: (8-4) * (7-1) = 24 Example 2: Input: [1, 2,…

题目链接:http://www.patest.cn/contests/ds/2-08 解题思路:思路参考24点游戏技巧http://www.24game.com.cn/articles/points24-game-tips-grade6.html 方法为:暴力枚举每次所选的数字和运算符的五种不同运算方式 五种不同运算方式如下(括号的五种不同组合): ((a1 op1 a2) op2 a3) op3 a4 (a1 op1 (a2 op2 a3)) op3 a4 (a1 op1 a2) op2 (a…

题目链接 https://leetcode-cn.com/problems/24-game/ 题目说明 题解 主要方法:递归 + 全排列 解释说明: 将 4 个数进行组合形成算式,发现除了 (a❈b)❈(c❈d) 的形式外,都可以通过单一的数字进行拆解,比如 (a*b+c)/d 可以逐步拆解成 (d -> (c -> (a -> (b)))).所以我们将特殊形式单独用全排列处理,一般情况用递归进行处理. 递归: 入口(数字list,目标值target) 下一步(取list中的一个值,将该…