以下C++代码将会输出：

using namespace std;

int countLoops(vector& nums, int target) {

int loops = 0;

int left = 0;

int right = nums.size() - 1;

while (left <= right) {

int mid = left + (right - left) / 2;

if (nums[mid] == target) {

return loops;

} else if (nums[mid] < target) {

left = mid + 1;

} else {

right = mid - 1;

}

loops++;

}

return loops;}

int main() {

vector nums = {1, 3, 5, 7, 9, 11, 13, 15, 17, 19};

int target = 13;

int loops = countLoops(nums, target);

cout << "找到目标值 " << target << " 需要循环 " << loops << " 次。" << endl;

return 0;}