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Introduction To C++
C++ is a general-purpose programming language that was developed as an enhancement of the C language to include object-oriented paradigm. It is an imperative and a compiled language.
C++ is a middle-level language rendering it the advantage of programming low-level (drivers, kernels) and even higher-level applications (games, GUI, desktop apps etc.). The basic syntax and code structure of both C and C++ are the same.
C++ programming language was developed in 1980 by Bjarne Stroustrup at bell laboratories of AT&T (American Telephone & Telegraph), located in U.S.A. Bjarne Stroustrup is known as the founder of C++ language.
Maps-STL in C++ - Hackerrank Solution
Maps are a part of the C++ STL. 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:
int>m; //Creates a map m where key_type is of type string and data_type is of type int.
int length=m.size(); //Gives the size of the map.
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:
int>::iterator itr=m.find(val); //Gives the iterator to the element val if it is found otherwise returns m.end() . Ex: map 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.
To know more about maps click Here.
You are appointed as the assistant to a teacher in a school and she is correcting the answer sheets of the students.Each student can have multiple answer sheets.So the teacher has Q queries:
- X Y : Add the marks Y to the student whose name is X.
- X : Erase the marks of the student whose name is X.
- X : print the marks of the student whose name is X. (if X didn’t get any marks print 0. )
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 one string and an integer X and Y where X is the name of the student and Y is the marks of the student. If query is of type 2 or 3, it consists of a single string X where X is the name of the student.
Output Format :
For queries of type 3 print the marks of the given student.
Sample Input :
7 1 Jesse 20 1 Jess 12 1 Jess 18 3 Jess 3 Jesse 2 Jess 3 Jess
Sample Output :
30 20 0
Maps-STL in C++ – Hacker Rank Solution
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