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  1. Prepare
  2. Algorithms
  3. Strings
  4. Gemstones
  5. Discussions

Gemstones

  • jannapureddykou1
     + 0 comments
    public static int gemstones(List<String> arr) {
    // Write your code here
    Map<Character,Integer> map=new HashMap<>();
    int count=0;
   
    for(String s: arr){
         HashSet<Character> res=new HashSet<>();
         for(char c:s.toCharArray()){
            if(res.add(c)){
                 map.put(c,map.getOrDefault(c,0)+1);
                 if(map.get(c)==arr.size())count++;
            }
            
        }
        
    }
    return count;

    }