题解 | 旋转数组的最小数字

二分法的变种

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param nums int整型一维数组 
     * @return int整型
     */
    public int minNumberInRotateArray (int[] nums) {
        // write code here
        int left = 0;
        int right = nums.length-1;
        int mid = 0;
        while(left < right){
            mid = (left+right)/2;
            if(nums[mid] > nums[right])
                left = mid + 1;
            else if(nums[mid] < nums[right])
                right = mid;
            else
                right = right-1;
        }
        return nums[(left+right)/2];
    }
}