The map() method of the LongStream class in Java returns a stream consisting of the results of applying the given function to the elements of this stream.The syntax is as follows:LongStream map(LongUnaryOperator mapper)Here, the parameter mapper is a stateless function to apply to each element. The LongUnaryOperator represents an operation ... Read More

A bind variable is an SQL statement with a temporary variable as place holders which are later replaced with appropriate values. For example, if you have a table named employee in the database created as shown below:+---------+--------+----------------+ | Name | Salary | Location ... Read More

To connect with a data base, you need toRegister the DriverSelect the required database register the Driver class of the particular database using the registerDriver() method of the DriverManager class or, the forName() method of the class named Class.DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get connectionCreate a connection object by passing the URL of the ... Read More

Here is a C++ Program to Perform Greedy ColoringAlgorithm:Begin    Take the number of vertices and edges as input.    Create function greedyColoring() to assign color to vertices:    A) Assign the first color to first vertex.    B) Initialize the remaining vertices.    C) Declare a temporary array to ... Read More

To insert new documents into a MongoDB collection, you need to use insert() method or save() method.Case 1: Using insert() method.The syntax is as follows:db.yourCollectionName.insert(yourDocument);Case 2: Using save() method.The syntax is as follows:db.yourCollectionName.save(yourDocument);In the above syntax, if your collection name does not exist then MongoDB will create a new collection ... Read More

         A Binary Search Tree is a sorted binary tree in which all the nodes will have following properties−The right sub-tree of a node has a key greater than to its parent node's key.The left sub-tree of a node has a key lesser than to its parent ... Read More

This is a C++ Program to implement Network_Flow problem using Ford Fulkerson algorithm.Algorithms:Begin    function bfs() returns true if there is path from source s to sink t in    the residual graph which indicates additional possible flow in the graph. End Begin    function fordfulkarson() return maximum flow in ... Read More

To delete the documents from a collection in MongoDB, you need to use remove() method. The syntax is as follows:db.yourCollectionName.remove(yourDeleteValue);Here, let us create a collection with some documents. The query is as follows:>db.deleteDocuments.insert({"UserId":1, "UserName":"Bob", "UserTechnicalSubject":"Introducti on to PL/SQL"}); WriteResult({ "nInserted" : 1 }) >db.deleteDocuments.insert({"UserId":2, "UserName":"Carol", "UserTechnicalSubject":"Introduction to MongoDB"}); WriteResult({ ... Read More

This is a C++ Program to Implement the Edmonds-Karp algorithm to calculate maximum flow between source and sink vertex.Algorithm:Begin    function edmondsKarp() :       initiate flow as 0.       If there is an augmenting path from source to sink, add the path to flow.     ... Read More

To delete document from a collection in MongoDB, you can use the deleteOne() method. Let us first create a collection and insert some documents to it:> db.deleteDocumentsDemo.insert({"Name":"Larry", "Age":23}); WriteResult({ "nInserted" : 1 }) > db.deleteDocumentsDemo.insert({"Name":"Mike", "Age":21}); WriteResult({ "nInserted" : 1 }) > db.deleteDocumentsDemo.insert({"Name":"Sam", "Age":24}); WriteResult({ "nInserted" : 1 })Now display ... Read More