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