小编ger*_*ion的帖子

我想在 C++ 中实现与此 Python 代码相同的更少（但内存效率更高）：

a = [1, 5, 3]
additional = 6
for elem in [additional] + a:
    print(elem) # prints: 6 1 5 3

# alternative without creating the additional vector:
import itertools
for elem in itertools.chain([additional], a):
    print(elem)

我知道在 C++ 中这样做的唯一方法是：

#include <iostream>
#include <vector>

int main() {
        std::vector<int> a = {1, 5, 3};
        int additional = 6;

        for (int i = 0; i < a.size() + 1; ++i) {
                int cur_elem;
                if (i == 0) { …