LeetCode/140_Word_Break_ii at master · KnowledgeCenterYoutube/LeetCode · GitHub

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Leetcode 140: Word Break ii
Detailed video explanation: https://youtu.be/9-grHHGUVls
========================================================

C++:
----
class Solution {
    unordered_map<string, vector<string>> dp;
public:
    vector<string> wordBreak(string s, vector<string>& wordDict) {
        if(dp.find(s) != dp.end()) return dp[s];
        vector<string> result;
        for(string w : wordDict){
            if(s.substr(0, w.length()) == w){
                if(w.length() == s.length())
                    result.push_back(w);
                else{
                    vector<string> tmp = wordBreak(s.substr(w.length()), wordDict);
                    for(string t : tmp)
                        result.push_back(w + " " + t);
                }
            }
        }
        dp[s] = result;
        return result;
    }
};


Python3:
--------
class Solution:
    def wordBreak(self, s: str, wordDict: List[str]) -> List[str]:
        dp = {}
        def word_break(s):
            if s in dp: return dp[s]
            result = []
            for w in wordDict:
                if s[:len(w)] == w:
                    if len(w) == len(s): result.append(w)
                    else:
                        tmp = word_break(s[len(w):])
                        for t in tmp:
                            result.append(w + " " + t)
            dp[s] = result
            return result

        return word_break(s)