erase std::vector element by value c++ code example

Example 1: c++ vector erase by value

//wiki - erase-remove idiom
// Use g++ -std=c++11 or clang++ -std=c++11 to compile.

#include <algorithm>  // remove and remove_if
#include <iostream>
#include <vector>  // the general-purpose vector container

void Print(const std::vector<int>& vec) {
  for (const auto& i : vec) {
    std::cout << i << ' ';
  }
  std::cout << '\n';
}

int main() {
  // Initializes a vector that holds numbers from 0-9.
  std::vector<int> v = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
  Print(v);

  // Removes all elements with the value 5.
  v.erase(std::remove(v.begin(), v.end(), 5), v.end());
  Print(v);
}

/*
Output:
0 1 2 3 4 5 6 7 8 9
0 1 2 3 4 6 7 8 9

*/

Example 2: remove element by value vector c++

#include<bits/stdc++.h>
using namespace std;
int main(){
    vector<int> v;
    //Insert values 1 to 10
    v.push_back(20);
    v.push_back(10);
    v.push_back(30);
    v.push_back(20);
    v.push_back(40);
    v.push_back(20);
    v.push_back(10);

    vector<int>::iterator new_end;
    new_end = remove(v.begin(), v.end(), 20);

    for(int i=0;i<v.size(); i++){
        cout << v[i] << " ";
    }
    //Prints [10 30 40 10]
    return 0;
}
C++Copy