Given a string of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. The valid operators are +, - and *. Example 1: Input: "2-1-1" Output: [0, 2] Explanation: ((2-1)-…
题目: Given a string of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. The valid operators are +, - and *. Example 1: Input: "2-1-1" Output: [0, 2] Explanation: ((2…
题目描述: 方法:分治* class Solution: def diffWaysToCompute(self, input: str) -> List[int]: if input.isdigit(): return [int(input)] tem = [] for k in range(len(input)): if input[k] == '+': tem.extend([i + j for i in self.diffWaysToCompute(input[:k]) for j in…
python中,有变量.值和运算符参与的语句叫做表达式. 比如: #字符串表达式 "hello" #运算表达式 + #赋值表达式 test = "hello" #变量表达式 test 运算符优先级 运算符 描述 lambda Lambda表达式 or 布尔“或” and 布尔“与” not x 布尔“非” in,not in 成员测试 is,is not 同一性测试 <,<=,>,>=,!=,== 比较 | 按位或 ^ 按位异或 &…
android data binding jetpack VIII BindingConversion android data binding jetpack VII @BindingAdapter android data binding jetpack V 实现recyclerview 绑定 android data binding jetpack IV 绑定一个方法另一种写法和参数传递 android data binding jetpack III 绑定一个方法 android dat…
1.单问号(?) 作用:用于给变量设初化的时候,给变量(int类型)赋为null值,而不是0. 例子: public int a; //默认值为0 public int ?b; //默认值为null 2.双问号(??) 作用:用于判断并赋值,先判断当前变量是否为null,如果是就可以赋一个新值,否则跳过. 例子: public int? b; //默认值为null public int IsNullOrSkip() { return b ?? 0; //返回值为0 } 错误例子: public…
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