2260. Minimum Consecutive Cards to Pick Up

class Solution {
    public int minimumCardPickup(int[] cards) {
        int index=0,sum=Integer.MAX_VALUE;
        HashMap<Integer,Integer> map=new HashMap<>();
        for(int i=0;i<cards.length;i++){
            if(map.containsKey(cards[i])){
                sum=sum>i-map.get(cards[i])+1?i-map.get(cards[i])+1:sum;
                index=i;
                map.put(cards[i],i);
            }else{
                map.put(cards[i],i);
            }
        }
        return sum=(index!=0)?sum:(-1);
    }
}