Minimum_ Consecutive_ Cards _to _Pick_ Up.cpp

class Solution {
public:
    int minimumCardPickup(vector<int>& cards) {
        int res= INT_MAX;
        unordered_map<int,int> mp;
        for (int i=0; i<cards.size(); i++){
            if (mp.find(cards[i]) != mp.end()){
                res= min(res,i-mp[cards[i]]+1);
            }
            mp[cards[i]]= i;
        }
        if (res==INT_MAX)return -1;
        return res;
    }
};