题解 | #二分查找-I#

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
     */
    func search ( _ nums: [Int],  _ target: Int) -> Int {
// write code here
        if nums.count == 0 {
            return -1
        }
        var left = 0, right = nums.count-1
        while left <= right {
            let mid = left + (right - left) / 2
            // let mid = (left + right) / 2
            if target == nums[mid] {
                return mid
            }
            if nums[mid] > target {
                right = mid - 1
            } else {
                left = mid + 1
            }
        }
        return -1
    }
}