在不使用foreach的情况下获取std类值

std::vector<int> myVector = {1, 2, 3, 4, 5};
int size = myVector.size();

for (int i = 0; i < size; i++) {
    int value = myVector[i];
    // 对每个值进行处理
}

std::vector<int> myVector = {1, 2, 3, 4, 5};

for (std::vector<int>::iterator it = myVector.begin(); it != myVector.end(); ++it) {
    int value = *it;
    // 对每个值进行处理
}

std::vector<int> myVector = {1, 2, 3, 4, 5};
int sum = std::accumulate(myVector.begin(), myVector.end(), 0);
// 对所有值求和