Removing Objects from std::vector

1#include <iostream>
2#include <vector>
3
4int main(){
5  std::vector<int> numbers{1, 2, 3, 4, 5};
6
7  // Remove the third element (index 2)
8  numbers.erase(numbers.begin() + 2); 
9
10  // Print the vector
11  for (int num : numbers) {
12    std::cout << num << ' ';
13  }
14  std::cout << '\n';
15
16  // Remove a range (first two elements)
17  numbers.erase( 
18    numbers.begin(), 
19    numbers.begin() + 2); 
20
21  // Print the vector again
22  for (int num : numbers) {
23    std::cout << num << ' ';
24  }
25}

1#include <iostream>
2#include <vector>
3#include <algorithm>
4
5int main(){
6  std::vector<int> numbers{
7    1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
8
9  // Remove all even numbers
10  numbers.erase(
11    std::remove_if(
12      numbers.begin(), numbers.end(),
13      [](int n){ return n % 2 == 0; }), 
14    numbers.end());
15
16  // Print the vector
17  for (int num : numbers) {
18    std::cout << num << ' ';
19  }
20}

1#include <iostream>
2#include <vector>
3
4int main(){
5  std::vector<int> numbers{1, 2, 3, 4, 5};
6
7  numbers.pop_back(); 
8
9  // Print the vector
10  for (int num : numbers) {
11    std::cout << num << ' ';
12  }
13}

1#include <iostream>
2#include <vector>
3
4int main(){
5  std::vector<int> numbers{
6    1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
7
8  for (auto it = numbers.begin();
9    it != numbers.end();) {
10    if (*it % 2 == 0) {
11      it = numbers.erase(it); 
12    } else { ++it; }
13  }
14
15  // Print the vector
16  for (int num : numbers) {
17    std::cout << num << ' ';
18  }
19}