c++ vector
#include <vector>
int main() {
std::vector<int> v;
v.push_back(10); // v = [10];
v.push_back(20); // v = [10, 20];
v.pop_back(); // v = [10];
v.push_back(30); // v = [10, 30];
auto it = v.begin();
int x = *it; // x = 10;
++it;
int y = *it; // y = 30
++it;
bool is_end = it == v.end(); // is_end = true
return 0;
}vector operations in c++
#include <iostream>
#include<vector>
#include<algorithm>
using namespace std;
int main()
{
int n;
cin>>n;
vector<int>vec(n);
for(int i=0;i<n;i++)
{
cin>>vec[i];
}
cout<<"----------"<<endl;
for(int i=0;i<n;i++)
{
cout<<vec[i]<<" ";
}
vec.push_back(100);
vec.push_back(200);
cout<<endl;
auto it=vec.begin();
vec.insert(it,3,1000);
for(vector<int>::iterator it1=vec.begin();it1!=vec.end();it1++)
{
cout<<*it1<<" ";
}
cout<<endl;
vector<int>vec2;
vec2.push_back(15);
vec2.push_back(25);
vec2.push_back(35);
vec.insert(it,vec2.begin(),vec2.end());
for(vector<int>::iterator it1=vec.begin();it1!=vec.end();it1++)
{
cout<<*it1<<" ";
}
cout<<endl;
vec.pop_back();
vec.pop_back();
for(vector<int>::iterator it1=vec.begin();it1!=vec.end();it1++)
{
cout<<*it1<<" ";
}
cout<<endl;
int k;
cin>>k;
cout<<endl;
vector<int>::iterator its=vec.begin()+k-1;
int s=vec.size();
cout<<s<<endl;
vec.erase(its);
for(vector<int>::iterator it1=vec.begin();it1!=vec.end();it1++)
{
cout<<*it1<<" ";
}
return 0;
}Copyright © 2021 Codeinu
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