题解 | #二分查找-I#

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
     * @param target int整型
     * @return int整型
     */
    public int search (int[] nums, int target) {
        int length = nums.length ;
        if (length <= 0) {
            return -1;
        }

        int index = 0;
        int half = 0;
        while (length >= 0) {
            half += (length - index) / 2;
            if(half >= length){
                return -1;
            }
            if (nums[half] > target) {
                length = half;
                half = 0;
            } else if (nums[half] < target) {
                if(index == half)return -1;
                index = half;
            } else if (nums[half] == target){
                return half;
            }
        }
        return index;
    }
}