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  1. Prepare
  2. Algorithms
  3. Implementation
  4. Migratory Birds
  5. Discussions

Migratory Birds

  • a_borraccino86
     + 0 comments

    Java

    public static int migratoryBirds(List<Integer> arr) {
    // Write your code here
    
        if(arr == null || arr.isEmpty()) return 0;
        if(arr.size() == 1) return arr.get(0);

        Map<Integer, Integer> counterMap = new HashMap<>();
        int maxFrequency = 0;
        int result = Integer.MAX_VALUE;
        for(Integer bird : arr){
            counterMap.put(bird, counterMap.getOrDefault(bird, 0) + 1);
            Integer frequency = counterMap.get(bird);
            if(frequency > maxFrequency){
                maxFrequency = frequency;
                result = bird;
            }

            if(frequency == maxFrequency){
                result = Math.min(result, bird);
            }
        }

        return result;

}