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 res = -1;
        if(nums.length ==0){
            return res;
        }
    
        int i = 0;
        int j = nums.length-1;
        while(i<=j){
            int m = (i+j)/2;
            if(nums[m] < target){
                i = m+1;
            }else if(nums[m] > target){
                j = m-1;
            }else if(nums[m] == target){
                return m;
            }
        } 
        return -1;
    }
}