给定序列:1,3,6,9,17,31,39,52,61,79,81,90,96。使用以下代码进行二分查找查找元素 82时,需要循环多少次,即最后输出的 times 值为( )。
int binarySearch(const std::vector<int>& arr, int target) {
int left = 0;
int right = arr.size() - 1;
int times = 0;
while (left <= right) {
times ++;
int mid = left + (right - left) / 2;
if (arr[mid] == target) {
cout << times << endl;
return mid;
} else if (arr[mid] < target) {
left = mid + 1;
} else {
right = mid - 1;
}
}
cout << times << endl;
return -1;
}
2
5
3
4