Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

#include <iostream>
#include <vector>
#include <array>
#include <deque>
#include <algorithm>
#include <numeric>   // std::iota

int main() {
    // --- std::vector ---
    std::vector<int> v;
    v.reserve(8);           // pre-allocate without changing size
    for (int i = 1; i <= 5; ++i) v.push_back(i * 10);

std::cout << "vector: ";
    for (int x : v) std::cout << x << " ";
    std::cout << "
";

v.erase(v.begin() + 2); // erase element at index 2
    v.insert(v.begin(), 0); // insert 0 at front
    std::cout << "after erase+insert: ";
    for (int x : v) std::cout << x << " ";
    std::cout << "
";

// --- std::array ---
    std::array<int, 5> arr;
    std::iota(arr.begin(), arr.end(), 1);  // fill 1,2,3,4,5
    std::cout << "array sum: "
              << std::accumulate(arr.begin(), arr.end(), 0) << "
";

// --- std::deque ---
    std::deque<std::string> dq;
    dq.push_back("middle");
    dq.push_front("front");
    dq.push_back("back");

std::cout << "deque: ";
    for (const auto& s : dq) std::cout << s << " ";
    std::cout << "
";

dq.pop_front();
    std::cout << "after pop_front: " << dq.front() << "
";

return 0;
}