Find Minimum in Rotated Sorted Array(Medium)

Suppose a sorted array is rotated at some pivot unknown to you beforehand.

(i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2).

Find the minimum element.

You may assume no duplicate exists in the array.

Java代码

public int findMin(int[] num) {
    if (num == null || num.length == 0) {
        return -1;
    }

    int left = 0, right = num.length - 1;
    while (left < right) {
        int mid = left + (right - left) / 2;
        if (num[mid] > num[right]) {
            left = mid + 1;
        } else {
            right = mid;
        }
    }
    return num[left];
}