帮我理解std :: erase

template<class Container, class T>
void erase(Container& container, const T& value);

#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    std::vector<int> vec = {1, 2, 3, 4, 5};

    // 删除一个元素
    vec.erase(vec.begin());
    std::cout << "Vector after removing the first element: ";
    for (int i : vec) {
        std::cout << i << " ";
    }
    std::cout << std::endl;

    // 删除一个范围内的元素
    std::vector<int> vec2 = {10, 20, 30, 40, 50};
    vec2.erase(vec2.begin() + 2, vec2.end());
    std::cout << "Vector after removing elements at index 2 to the end: ";
    for (int i : vec2) {
        std::cout << i << " ";
    }
    std::cout << std::endl;

    return 0;
}