carloscn / structstudy

Leetcode daily trainning by using C/C++/RUST programming.
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leetcode1720:解码异或后的数组(decode-xored-array) #270

Open carloscn opened 1 year ago

carloscn commented 1 year ago

问题描述

未知 整数数组 arr 由 n 个非负整数组成。

经编码后变为长度为 n - 1 的另一个整数数组 encoded ,其中 encoded[i] = arr[i] XOR arr[i + 1] 。例如,arr = [1,0,2,1] 经编码后得到 encoded = [1,2,3] 。

给你编码后的数组 encoded 和原数组 arr 的第一个元素 first(arr[0])。

请解码返回原数组 arr 。可以证明答案存在并且是唯一的。

 

示例 1:

输入:encoded = [1,2,3], first = 1 输出:[1,0,2,1] 解释:若 arr = [1,0,2,1] ,那么 first = 1 且 encoded = [1 XOR 0, 0 XOR 2, 2 XOR 1] = [1,2,3]

示例 2:

输入:encoded = [6,2,7,3], first = 4 输出:[4,2,0,7,4]  

提示:

2 <= n <= 104 encoded.length == n - 1 0 <= encoded[i] <= 105 0 <= first <= 105

来源:力扣(LeetCode) 链接:https://leetcode.cn/problems/decode-xored-array

carloscn commented 1 year ago

问题解析

pub fn decode(encoded: Vec<i32>, first: i32) -> Vec<i32>
{
    if encoded.len() < 1 {
        return encoded;
    }

    let mut ret:Vec<i32> = vec![];

    ret.push(first);

    for i in 0..encoded.len() {
        ret.push(ret[i] ^ encoded[i]);
    }

    return ret;
}
carloscn commented 1 year ago

code

https://review.gerrithub.io/c/carloscn/structstudy/+/556500 https://github.com/carloscn/structstudy/commit/be6a8b85aac0a5d7fb1ee899b869a82bd26fd607