35、Search Insert Position

Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order.

You may assume no duplicates in the array.

Here are few examples.

[1,3,5,6]

, 5 → 2

[1,3,5,6]

, 2 → 1

[1,3,5,6]

, 7 → 4

[1,3,5,6]

, 0 → 0

Array Binary
Search

int searchInsert(int A[], int n, int target) {
//此题比较简单，顺序遍历是好的，但是对于有序数组来说，我们尝试使用二分搜索
int low  = 0, high = n, mid;
while (low < high)
{
mid = (low + high) / 2;
if (A[mid] >= target)
high = mid;
else
low = mid + 1;
}
if (A[mid] >= target)
return mid;
else
return mid + 1;

}