How to delete an element from the Set by passing its value in C++
Given a Set, the task is to remove the last element from this Set in C++.
Examples:
Input: set = [10 20 30 70 80 90 100 40 50 60], valueOfElementToBeDeleted = 100 Output: 10 20 30 40 50 60 70 80 90 Input: set = [1 2 3 4 5], valueOfElementToBeDeleted = 3 Output: 1 2 4 5
Sets are a type of associative container in which each element has to be unique because the value of the element identifies it. The value of the element cannot be modified once it is added to the set, though it is possible to remove and add the modified value of that element.
Approach: In this method, the last element is deleted by using the erase function and calling it with the value of the last element as its argument. If the value of the last element is not known, then use the previous method.
Syntax:
size_type erase (const value_type& valueOfElementToBeDeleted);
Below is the implementation of the above approach:
C++
// C++ program to delete an element // of a Set by passing its value #include <iostream> #include <set> using namespace std; // Function to print the set void printSet(set< int > myset) { // Get the iterator set< int >::iterator it; // printing all the elements of the set for (it = myset.begin(); it != myset.end(); ++it) cout << ' ' << *it; cout << '\n' ; } // Function to delete the element of set void deleteByValue(set< int > myset, int valueOfElementToBeDeleted) { // printing all the elements of the set cout << "\nSet originally: " ; printSet(myset); // Erase the element that is equal to // the value passed as the parameter myset.erase(valueOfElementToBeDeleted); // printing all the elements of the set cout << "Set after deleting " << valueOfElementToBeDeleted << ": " ; printSet(myset); } // Driver code int main() { set< int > myset; // Get the set for ( int i = 1; i < 10; i++) myset.insert(i * 10); // Get the valueOfElementToBeDeleted int valueOfElementToBeDeleted = 50; // Delete an element from the Set deleteByValue(myset, valueOfElementToBeDeleted); return 0; } |
Java
// Java program to delete an element // of a Set by passing its value import java.io.*; import java.util.*; class GFG { // Function to print the set static void printSet(TreeSet<Integer> myset) { // printing all the elements of the set for ( int it : myset) { System.out.print(it + " " ); } System.out.println(); } // Function to delete the element of set static void deleteByValue(TreeSet<Integer> myset, int valueOfElementToBeDeleted) { // printing all the elements of the set System.out.print( "\nSet originally: " ); printSet(myset); // Erase the element that is equal to // the value passed as the parameter myset.remove(valueOfElementToBeDeleted); // printing all the elements of the set System.out.print( "Set after deleting " + valueOfElementToBeDeleted + ": " ); printSet(myset); } // Driver code public static void main (String[] args) { //Set<Integer> myset = new HashSet<Integer>(); TreeSet<Integer> myset = new TreeSet<Integer>(); // Get the set for ( int i = 1 ; i < 10 ; i++) { myset.add(i * 10 ); } // Get the valueOfElementToBeDeleted int valueOfElementToBeDeleted = 50 ; // Delete an element from the Set deleteByValue(myset, valueOfElementToBeDeleted); } } // This code is contributed by avanitrachhadiya2155 |
Python3
# Python3 program to delete an element of a # set by passing of a set by passing its value # function to print the set def printset(myset): for i in myset: print (i, end = " " ) print () # function to delete the element of a set def deleteByValue(myset, value): myset = sorted (myset) # printing original value print ( "Set originally:" , end = " " ) printset(myset) # Erase the element that is equal to # the value passed as the parameter myset.remove(value) # printing all the elements of the set print ( "Set after deleting" , value, ":" , end = " " ) printset(myset) # Driver code myset = set () for i in range ( 1 , 10 ): myset.add(i * 10 ) # Get the valueOfElementToBeDeleted value = 50 # Delete an element from the Set deleteByValue(myset, value); # This code is contributed # by Mohit kumar 29 |
C#
// C# program to delete an element // of a Set by passing its value using System; using System.Collections.Generic; public class GFG { // Function to print the set static void printSet(HashSet< int > myset) { // printing all the elements of the set foreach ( int it in myset) { Console.Write(it + " " ); } Console.WriteLine(); } // Function to delete the element of set static void deleteByValue(HashSet< int > myset, int valueOfElementToBeDeleted) { // printing all the elements of the set Console.Write( "\nSet originally: " ); printSet(myset); // Erase the element that is equal to // the value passed as the parameter myset.Remove(valueOfElementToBeDeleted); // printing all the elements of the set Console.Write( "Set after deleting " + valueOfElementToBeDeleted + ": " ); printSet(myset); } // Driver code static public void Main () { //Set<Integer> myset = new HashSet<Integer>(); HashSet< int > myset = new HashSet< int >(); // Get the set for ( int i = 1; i < 10; i++) { myset.Add(i * 10); } // Get the valueOfElementToBeDeleted int valueOfElementToBeDeleted = 50; // Delete an element from the Set deleteByValue(myset, valueOfElementToBeDeleted); } } // This code is contributed by rag2127 |
Javascript
<script> // JavaScript program to delete an element // of a Set by passing its value // Function to print the set function printSet(myset) { // printing all the elements of the set for (let it of myset.values()) { document.write(it + " " ); } document.write( "<br>" ); } // Function to delete the element of set function deleteByValue(myset, valueOfElementToBeDeleted) { // printing all the elements of the set document.write( "<br>Set originally: " ); printSet(myset); // Erase the element that is equal to // the value passed as the parameter myset. delete (valueOfElementToBeDeleted); // printing all the elements of the set document.write( "Set after deleting " + valueOfElementToBeDeleted + ": " ); printSet(myset); } // Driver code //Set<Integer> myset = new HashSet<Integer>(); let myset = new Set(); // Get the set for (let i = 1; i < 10; i++) { myset.add(i * 10); } // Get the valueOfElementToBeDeleted let valueOfElementToBeDeleted = 50; // Delete an element from the Set deleteByValue(myset, valueOfElementToBeDeleted); // This code is contributed by patel2127 </script> |
Output:
Set originally: 10 20 30 40 50 60 70 80 90 Set after deleting 50: 10 20 30 40 60 70 80 90
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