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) {
        // write code here
        // 解题思路：2分查询+双下标
        if (nums == null || nums.length == 0) {
            return -1;
        }

        int left = 0;
        int right = nums.length - 1;

        while (left <= right) {
            int mid = (left + right) / 2;
            int val = nums[mid];
            if (val == target) {
                return mid;
            }

            if (val > target) {
                right = mid - 1;
            } else {
                left = mid + 1;
            }
        }

        return -1;
    }



}