Encode and Decode Strings -- LeetCode

最新推荐文章于 2019-01-08 04:13:18 发布

转载最新推荐文章于 2019-01-08 04:13:18 发布 · 124 阅读

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原文链接：http://www.cnblogs.com/fenshen371/p/5814820.html

本文介绍了一种用于在网络上传输字符串列表的编解码算法。该算法通过在每个字符串前添加其长度和特定标记来实现编码，并在接收端进行解码还原。

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Design an algorithm to encode a list of strings to a string. The encoded string is then sent over the network and is decoded back to the original list of strings.

Machine 1 (sender) has the function:

string encode(vector<string> strs) {
  // ... your code
  return encoded_string;
}

Machine 2 (receiver) has the function:

vector<string> decode(string s) {
  //... your code
  return strs;
}

So Machine 1 does:

string encoded_string = encode(strs);

and Machine 2 does:

vector<string> strs2 = decode(encoded_string);

strs2 in Machine 2 should be the same as strs in Machine 1.

Implement the encode and decode methods.

Note:

The string may contain any possible characters out of 256 valid ascii characters. Your algorithm should be generalized enough to work on any possible characters.
Do not use class member/global/static variables to store states. Your encode and decode algorithms should be stateless.
Do not rely on any library method such as eval or serialize methods. You should implement your own encode/decode algorithm.

思路：每个字符串之前添加它的长度和一个%字符。

 1 class Codec {
 2 public:
 3 
 4     // Encodes a list of strings to a single string.
 5     string encode(vector<string>& strs) {
 6         string res;
 7         for (int i = 0; i < strs.size(); i++)
 8             res += std::to_string(strs[i].size()) + "%" + strs[i];
 9         return res;
10     }
11 
12     // Decodes a single string to a list of strings.
13     vector<string> decode(string s) {
14         vector<string> res;
15         int curInd = 0;
16         int mark = s.find("%");
17         while (mark != std::string::npos) {
18             int len = std::stoi(s.substr(curInd, mark - curInd));
19             if (len) res.push_back(s.substr(mark + 1, len));
20             //in case it is an empty string
21             else res.push_back("");
22             curInd = mark + len + 1;
23             mark = s.find("%", curInd);
24         }
25         return res;
26     }
27 };
28 
29 // Your Codec object will be instantiated and called as such:
30 // Codec codec;
31 // codec.decode(codec.encode(strs));

转载于:https://www.cnblogs.com/fenshen371/p/5814820.html