力扣704

做了35显然704是简单的…或许是因为二分法开局是这样的..慢慢来啦

实际是704我的答案错了一次…

直接上二分法…开始培养好的代码风格吧…

以下为错误代码：

class Solution {
    public int search(int[] nums, int target) {
        int low = 0,high = nums.length-1;
        while (low < high) {
            int mid = (low + high) / 2;
            if (nums[mid] == target) {
                return mid;
            }
            if (nums[mid] < target) {
                ++low;
            }
            else {
                --high;
            }
        }
        return -1;
    }
}

33/47的样例

输入[5] 5的时候理应返回0，而我是-1

改的方法就是一个地方：while (low <= high)

最后代码

class Solution {
    public int search(int[] nums, int target) {
        int low = 0,high = nums.length-1;
        while (low <= high) {
            int mid = (low + high) / 2;
            if (nums[mid] == target) {
                return mid;
            }
            if (nums[mid] < target) {
                ++low;
            }
            else {
                --high;
            }
        }
        return -1;
    }
}