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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"] orwe 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

`71 3 51 2 12 43 32 33 33 2`

Sample Output

`501`
Hints
• Complete Solution

Discussion

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