2695. 包装数组
2695. 包装数组
题目
Create a class ArrayWrapper
that accepts an array of integers in its constructor. This class should have two features:
- When two instances of this class are added together with the
+
operator, the resulting value is the sum of all the elements in both arrays. - When the
String()
function is called on the instance, it will return a comma separated string surrounded by brackets. For example,[1,2,3]
.
Example 1:
Input: nums = [[1,2],[3,4]], operation = "Add"
Output: 10
Explanation:
const obj1 = new ArrayWrapper([1,2]);
const obj2 = new ArrayWrapper([3,4]);
obj1 + obj2; // 10
Example 2:
Input: nums = [[23,98,42,70]], operation = "String"
Output: "[23,98,42,70]"
Explanation:
const obj = new ArrayWrapper([23,98,42,70]);
String(obj); // "[23,98,42,70]"
Example 3:
Input: nums = [[],[]], operation = "Add"
Output: 0
Explanation:
const obj1 = new ArrayWrapper([]);
const obj2 = new ArrayWrapper([]);
obj1 + obj2; // 0
Constraints:
0 <= nums.length <= 1000
0 <= nums[i] <= 1000
Note: nums is the array passed to the constructor
题目大意
创建一个名为 ArrayWrapper
的类,它在其构造函数中接受一个整数数组作为参数。该类应具有以下两个特性:
- 当使用
+
运算符将两个该类的实例相加时,结果值为两个数组中所有元素的总和。 - 当在实例上调用
String()
函数时,它将返回一个由逗号分隔的括在方括号中的字符串。例如,[1,2,3]
。
提示:
0 <= nums.length <= 1000
0 <= nums[i] <= 1000
注意:nums 是传递给构造函数的数组。
解题思路
- 定义包装类:创建一个名为
ArrayWrapper
的类,接收一个数组作为构造参数。 - 实现基本方法:
toString
:返回数组的字符串表示形式。valueOf
:返回数组元素的总和。
- 重载运算符:使用
valueOf
来支持加法操作,确保可以直接与数字进行相加。
复杂度分析
- 时间复杂度:
O(n)
,其中n
是数组的长度,求和和获取长度操作需要遍历数组。 - 空间复杂度:
O(1)
,只使用了固定的额外空间。
代码
/**
* @param {number[]} nums
* @return {void}
*/
var ArrayWrapper = function (nums) {
this.arr = arr; // 存储数组
};
/**
* @return {number}
*/
ArrayWrapper.prototype.valueOf = function () {
return this.arr.reduce((acc, cur) => acc + cur, 0); // 返回数组元素的总和
};
/**
* @return {string}
*/
ArrayWrapper.prototype.toString = function () {
return JSON.stringify(this.arr); // 返回数组的字符串表示
};
/**
* const obj1 = new ArrayWrapper([1,2]);
* const obj2 = new ArrayWrapper([3,4]);
* obj1 + obj2; // 10
* String(obj1); // "[1,2]"
* String(obj2); // "[3,4]"
*/