• First Bad Version


    You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality check. Since each version is developed based on the previous version, all the versions after a bad version are also bad.

    Suppose you have n versions [1, 2, ..., n] and you want to find out the first bad one, which causes all the following ones to be bad.

    You are given an API bool isBadVersion(version) which will return whether version is bad. Implement a function to find the first bad version. You should minimize the number of calls to the API.

    // Forward declaration of isBadVersion API.
    bool isBadVersion(int version);
    
    class Solution {
    public:
        int firstBadVersion(int n) {
            int left=1;
            int right=n;
            while(left<=right)
            {
                int mid=left+((right-left)>>1);
                if(isBadVersion(mid))
                {
                    if(mid==1||mid>1&&!isBadVersion(mid-1))
                        return mid;
                    right=mid-1;
                }
                else
                    left=mid+1;
            }
            return -1;
        }
    };
  • 相关阅读:
    Regexp:教程
    Regexp:目录
    笔记-C#:C# 方法、属性杂项-01
    Regexp:正则表达式应用——实例应用
    正则表达式:百科
    Regexp:template
    AngularJS:参考手册
    命令目录
    java实现连续数的公倍数
    java实现连续数的公倍数
  • 原文地址:https://www.cnblogs.com/wuchanming/p/4823755.html
Copyright © 2020-2023  润新知