class LRUCache {
public:
    map<int,int> mymap;
    list<int> ls;
    int cp;
    LRUCache(int capacity) {
        cp = capacity;
        mymap.clear();
        ls.clear();
    }
    
    int get(int key) {
        if(mymap.find(key) == mymap.end()) return -1;
        ls.remove(key);
        ls.push_front(key);
        return mymap[key];
    }
    
    void put(int key, int value) {
        if(mymap.find(key) == mymap.end()){
            if(ls.size() == cp){
                /// full
                int last = ls.back();
                ls.pop_back();
                mymap.erase(last);
            }
            mymap[key] = value;
            ls.push_front(key);
            
        }else{
            ls.remove(key);
            ls.push_front(key);
            mymap[key] = value;
        }
    }
};

/**
 * Your LRUCache object will be instantiated and called as such:
 * LRUCache* obj = new LRUCache(capacity);
 * int param_1 = obj->get(key);
 * obj->put(key,value);
 */