v.erase(pos);
v.erase(start_iterator,end_iterator);

#include<iostream>
#include<vector>
using namespace std;
int main()
{
    vector<char> v{'C','+','#'};
    v.erase(v.begin()+1);
    for(int i=0;i<v.size();i++)
    cout<<v[i];
    return 0;
}

C#

#include<iostream>
#include<vector>
using namespace std;
int main()
{
vector<string>  fruit{"mango","apple","strawbery","kiwi","banana"};
cout<<"fruit names are :";
for(int i=0;i<fruit.size();i++)
cout<<fruit[i]<<" ";
cout<<'\n';
fruit.erase(fruit.begin()+1,fruit.begin()+3);
cout<<"After removing apple and strawbery fruits,"<<'\n';
for(int i=0;i<fruit.size();i++)
cout<<fruit[i]<<" ";
return 0;
}

fruit names are :mango, apple,strawberry, kiwi, banana 
After removing apple and strawbery fruits,
Mango, kiwi, banana