C++ Vector

#include <iostream>
#include <stdexcept>
#include <vector>

int main() {
    std::vector<int> v{5, 3, 9};
    v.push_back(1);
    v.insert(v.begin(), 7);
    std::cout << v.size() << ' ' << v.front() << ' ' << v.back() << ' ' << v[2] << '\n';
    v.erase(v.begin() + 1);
    std::erase_if(v, [](int n) { return n > 8; });   // C++20
    for (int n : v) std::cout << n << ' ';
    std::cout << '\n';
    try {
        v.at(10);
    } catch (const std::out_of_range& e) {
        std::cout << "out of range\n";
    }
}