How to Remove an Element from Vector in C++?

In this article, we will learn how to remove a given element from the vector in C++.

The most straightforward method to delete a particular element from a vector is to use the vector erase() method. Let's look at a simple example that shows how to use this function:

#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<int> v = {1, 5, 7, 4};

    // Removing 7 from vector v
    v.erase(find(v.begin(), v.end(), 7));

    for (auto i : v)
        cout << i << " ";
    return 0;
}

1 5 4 

Explanation: The vector erase() function removes the element using iterator not value, so iterator to the element to be removed is determined using find() function.

C++ also provide more methods to delete the element or multiple elements from the given vector. Some of them are as follows:

Using remove() with Vector pop_back()

The remove() function shift an element that have to be remove to the end of vector. The last element is then deleted by vector pop_back() method.

Example

#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<int> v = {1, 5, 7, 4};

    // Shifting 7 to the end of vector
    remove(v.begin(), v.end(), 7);
  
  	// Deleting the last element i.e. 7
    v.pop_back();

    for (auto i : v)
        cout << i << " ";
    return 0;
}

1 5 4 

We can also use vector erase() method to delete the last element.

Using vector clear()

The vector clear() method is used when all the elements of the vector have to be removed.

#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<int> v = {1, 5, 7, 4};

  	// Removing all the elements
    v.clear();

    for (auto i : v)
        cout << i << " ";
    return 0;
}

Output

(empty)

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Article Tags :

• C++ Programs
• C++
• STL
• cpp-vector
• CPP Examples

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Practice Tags :

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• STL