#include <iostream>
#include <vector>

template<typename T>
void remove(std::vector<T>& vec, T val) {
    size_t len = 0;
    for (int i = 0; i < vec.size(); i++) {
        if (vec[i] != val) {
            std::swap(vec[len++], vec[i]);
        }
    }
    vec.resize(len);
}

int main() {
    std::vector<int> vec = {0, 1, 0, 0, 2, 0, 3, 0};
    remove(vec, 0);
    for (const auto& val : vec) {
        std::cout << val << std::endl;
    }
}