Word ladder 1

static int speedUp=[](){
    std::ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    return 0;
}();

class Solution {
public:
    int ladderLength(string beginWord, string endWord, vector<string>& wordList) {  
        unordered_set<string> myset;
        bool isPresent = false; //Checks if endWord is present in Dict
        //Insert all words from Dict in myset
        for(auto word: wordList)
        {
            if(endWord.compare(word)==0)
                isPresent = true;
            myset.insert(word);    //Insert word in Dict
        }
        if(isPresent==false)    //endWord is not present in Dict
            return 0;
        
        queue<string> q;
        q.push(beginWord);
        int depth = 0;
        
        while(!q.empty())
        {
            depth+=1;
            int lsize = q.size();   //No of elements at a level
            while(lsize--)
            {
                string curr = q.front();
                q.pop();
                //check for all possible 1 depth words
                for(int i=0;i<curr.length();++i)  //For each index
                {
                    string temp = curr;
                    for(char c='a';c<='z';++c)  //Try all possible chars
                    {
                        temp[i] = c;
                        if(curr.compare(temp)==0)
                            continue;   //Skip the same word
                        if(temp.compare(endWord)==0)
                            return depth+1; //endWord found
                        if(myset.find(temp)!=myset.end())
                        {
                            q.push(temp);
                            myset.erase(temp);
                        }
                    }
                }
            }
        }
        return 0;
    }
};

java solution

public class Solution {
public int solve(String beginWord, String endWord, String[] wordList) {
Set myset = new HashSet();
boolean isPresent = false; //Checks if endWord is present in Dict
//Insert all words from Dict in myset
for(String word: wordList)
{
if(endWord.compareTo(word) == 0)
isPresent = true;
myset.add(word); //Insert word in Dict
}
if(isPresent==false) //endWord is not present in Dict
return 0;

         Queue<String> q = new LinkedList<>();
    q.add(beginWord);
    int depth = 0;
    
    while(!q.isEmpty())
    {
        depth+=1;
        int lsize = q.size();   //No of elements at a level
        while(lsize-- > 0)
        {
            String curr = q.poll();
            //check for all possible 1 depth words
            for(int i=0;i<curr.length();++i)  //For each index
            {
                StringBuilder temp1 = new StringBuilder(curr);
                for(char c='a';c<='z';++c)  //Try all possible chars
                {
                    temp1.setCharAt(i, c);
                    String temp = temp1.toString();
                    
                    if(curr.compareTo(temp) == 0)
                        continue;   //Skip the same word
                    if(temp.compareTo(endWord) == 0)
                        return depth+1; //endWord found
                    if(myset.contains(temp))
                    {
                        q.add(temp);
                        myset.remove(temp);
                    }
                }
            }
        }
    }
    return 0;
}

}