1684. Count the Number of Consistent Strings

Solution Code

C#

public class Solution {
    public int MarkCharacters(String word) {
        int marked = 0;
        
        foreach (char ch in word.ToCharArray()) {
            int position = ch - 'a';
            marked |= 1 << position;
        }
        
        return marked;
    }
    
    public int CountConsistentStrings(string allowed, string[] words) {
        int markedAllowed = MarkCharacters(allowed);
        int answer = 0;
        
        foreach (String word in words) {
            int markedWord = MarkCharacters(word);
            
            if ((markedWord & markedAllowed) == markedWord)
                answer++;
        }
        
        return answer;
    }
}

C++

class Solution {
public:
    int markCharacters(string &word) {
        int marked = 0;
        
        for (char ch : word) {
            int position = ch - 'a';
            marked |= 1 << position;
        }
        
        return marked;
    }
        
    int countConsistentStrings(string allowed, vector<string>& words) {
        int markedAllowed = markCharacters(allowed);
        int answer = 0;
        
        for (string word : words) {
            int markedWord = markCharacters(word);
            
            if ((markedWord & markedAllowed) == markedWord)
                answer++;
        }
        
        return answer;
    }
};

Java

class Solution {
    public int markCharacters(String word) {
        int marked = 0;
        
        for (char ch : word.toCharArray()) {
            int position = Character.getNumericValue(ch);
            marked |= 1 << position;
        }
        
        return marked;
    }
    
    public int countConsistentStrings(String allowed, String[] words) {
        int markedAllowed = markCharacters(allowed);
        int answer = 0;
        
        for (String word : words) {
            int markedWord = markCharacters(word);
            
            if ((markedWord & markedAllowed) == markedWord)
                answer++;
        }
        
        return answer;
    }
}