Package g0201_0300.s0278_first_bad_version

Class Solution

  • All Implemented Interfaces:
    
public final class Solution
extends VersionControl

    278 - First Bad Version\.

    Easy

    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 returns whether version is bad. Implement a function to find the first bad version. You should minimize the number of calls to the API.

    Example 1:

    Input: n = 5, bad = 4

    Output: 4

    Explanation:

    call isBadVersion(3) -> false
call isBadVersion(5) -> true
call isBadVersion(4) -> true
Then 4 is the first bad version.

    Example 2:

    Input: n = 1, bad = 1

    Output: 1

    Constraints:

    • <code>1 <= bad <= n <= 2<sup>31</sup> - 1</code>

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Integer firstBadVersion(Integer n)

      • Methods inherited from class g0201_0300.s0278_first_bad_version.VersionControl

        isBadVersion

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait