题解 | #二分查找-I#

using System;
using System.Collections.Generic;


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 (List<int> nums, int target) {
        if( nums.Count == 1 ){
            if(nums[0] == target){
               return 0;
            }
            else{
                return -1;
            }
        }

        int left = 0, right = nums.Count -1;

        while(left <= right){
            int leftNum = nums[left];
            int rightNum = nums[right];

            if(leftNum == target){
                return left;
            }else if (rightNum == target)
            {
                return right;
            }else{
                left ++;
                right --;
            }
        } 
        return -1;
    }
}