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Maps

Maps are associative containers that store elements formed by a combination of a key value and a mapped value, following a specific order.

The mainly used member functions of maps are:

  • Map Template:
    map <key_type, data_type>
  • Declaration
    map<string,int> m; //Creates a map m where key_type is of type string and data_type is of type int.
  • Size:
    int length = m.size(); //Gives the size of the map.
  • Insert:
    m.insert(make_pair("hello",9)); //Here the pair is inserted into the map where the key is "hello" and the value associated with it is 9.
  • Erasing an element:
    m.erase(val); //Erases the pair from the map where the key_type is val.
  • Finding an element:
    map<string,int>::iterator itr=m.find(val); //Gives the iterator to the element val if it is found otherwise returns m.end() .
    Ex: map<string,int>::iterator itr=m.find("Maps"); //If Maps is not present as the key value then itr==m.end().
  • Accessing the value stored in the key:
    To get the value stored of the key "MAPS" we can do m["MAPS"] or
    we can get the iterator using the find function and then by itr->second we can access the value.

Try the following example in the editor below.

There are some boxes and each having a unique id. You are given Q queries of three types to be performed on the boxes.

  • 1 X Y : Add the Y balls to the box whose id is X.
  • 2 X : Remove all balls from the box whose id is X.
  • 3 X : Print the number of balls in the box id X.

Input Format

  • The first line of the input contains Q where Q is the number of queries.
  • The next Q lines contain 1 query each. The first integer, type of each query is the type of the query.
    • If query is of type 1, it consists of two integer X and Y.
    • If query is of type 2 or 3, it consists of a single integer X where X is the id of box.

Constraints

1 <= Q <= 105 
1 <= Y <= 104
1 <= X <= 109

Sample Input

7
1 3 5
1 2 1
2 4
3 3
2 3
3 3
3 2

Sample Output

5
0
1
Start solving Maps on Interview Code Editor
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