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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:
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));
Encode and Decode Strings -- LeetCode
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原文地址：http://www.cnblogs.com/fenshen371/p/5814820.html
