两个元素的std::vector的C++反转数组

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

int main() {
    std::vector<int> vec {1, 2, 3, 4, 5};
    
    // 反转前
    std::cout << "Before reverse: ";
    for (const auto& num : vec) {
        std::cout << num << " ";
    }
    std::cout << std::endl;
    
    // 反转数组
    std::reverse(vec.begin(), vec.begin() + 2);
    
    // 反转后
    std::cout << "After reverse: ";
    for (const auto& num : vec) {
        std::cout << num << " ";
    }
    std::cout << std::endl;
    
    return 0;
}

Before reverse: 1 2 3 4 5
After reverse: 2 1 3 4 5