Method put

Hashtable/design-hashmap.cpp:8–17

    vector<pair<int,int>> bucket[100]; //bucket is an array whose each element is a vector of pair
    
    void put(int key, int value) {
        int index = key%100;
        for(int i=0 ; i<bucket[index].size(); i++){
            if(bucket[index][i].first==key){
               bucket[index][i].second=value;
               return;
            }
        }
        bucket[index].push_back({key,value});
     }   
    
    int get(int key) {
        int index = key%100;