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Encode and Decode Strings -- LeetCode
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 string21 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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