Commvault 面试体验（校内）
Commavault访问了我们的校园，招聘SDE (C++/ Java)和SDET(PYTHON)职位。如果你 选择 您将获得C++/ Java语言 SDE 角色和Python SDET 角色。
第一轮：在他们的平台上进行在线编码。网络摄像头已打开。有 15 个 MCQ 和 3 个编码问题。 MCQ 主要基于 OOP，以及一个简单的和两个中等的编码问题。
- 最长回文子串
- BST的两个节点之间的最大元素
不记得基于异或。
第二轮：虚拟文件系统的实现。 我们必须完成他们的虚拟文件系统的代码。这一轮是6个小时。整个代码将在 6 小时内完成。
Java
import java.io.*;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
// Java class to calculate MD5 hash value
class MD5 {
public static String getMd5(String input)
{
try {
// Static getInstance method is called with
// hashing MD5
MessageDigest md
= MessageDigest.getInstance("MD5");
// digest() method is called to calculate
// message digest
// of an input digest() return array of byte
byte[] messageDigest
= md.digest(input.getBytes());
// Convert byte array into signum representation
BigInteger no
= new BigInteger(1, messageDigest);
// Convert message digest into hex value
String hashtext = no.toString(16);
while (hashtext.length() < 32) {
hashtext = "0" + hashtext;
}
return hashtext;
}
catch (
NoSuchAlgorithmException
e) { // incorrect message digest algorithms
throw new RuntimeException(e);
}
}
}
class CV_SIOManager {
public CV_SIOManager() {}
public CVFile CVGetFile(
final String
filePathName) // Returns the reference to the
// CVFile object for the given
// filePathName.
{
// Put your code here
return null;
}
public void
CVDisplayStats() // Display the whole stats that
// CV_SIOManager holds.
{
// Put your code here
}
public int CVDeleteFile(
final String filePathName) // Deletes a file in the
// given path.
{
// Put your code here
return 0;
}
public int CVMoveFile(
final String sourcePathName,
final String targetPathName) // Moves file from one
// location to
// another.
{
// Put your code here
return 0;
}
public int CVCopyFile(
final String sourcePathName,
final String targetPathName) // Copies file from one
// location to
// another.
{
// Put your code here
return 0;
}
}
class CVFile {
private String fileName;
public CVFile()
{
// put your code here
}
public CVFile(
final String filePathName,
final String
content) // Creates a file with given content.
{
// Put your code here
fileName = filePathName;
}
public void CVModifyFile(
final String
content) // Modifies and rewrites the content of
// a file with given content.
{
// Put your code here
}
public int
CVReadFile(int revision, /* output */ String
content) // Reads file content based on
// the given revision.
{
// Put your code here
return 0;
}
public int CVTrim() // Trims all previous versions and
// only holds on to latest content
{
// Put your code here
return 0;
}
}
/*****
* NOTE ---- 1. Do not make any modifications to main(). 2.
Every filePathName
* given in this problem is the absolute file path with file
name like
* DriveName:\\Path\\To\\FileName (Eg: C:\\A.txt).
*****/
public class SIOManagerDriver {
public static void main(String[] args)
{
CV_SIOManager sm = new CV_SIOManager();
String contentInFile = "";
CVFile fx;
CVFile f1 = new CVFile("C:\\File1.txt",
"Welcome to Commvault 1!");
CVFile f2 = new CVFile("C:\\File2.txt",
"All The Best 2!");
CVFile f2_1 = new CVFile("C:\\File2_1.txt",
"All The Best 2!");
CVFile f9
= new CVFile("C:\\File9.txt", "This is File 9");
sm.CVDisplayStats();
CVFile f4
= new CVFile("C:\\File4.txt", "Good Luck 4!");
CVFile f4_1
= new CVFile("C:\\File4_1.txt", "Good Luck 4!");
sm.CVDisplayStats();
CVFile f10
= new CVFile("D:\\File10.txt", "Good Luck 10!");
CVFile f20 = new CVFile("D:\\File20.txt",
"Welcome to Commvault 20!");
CVFile f50 = new CVFile("D:\\File50.txt",
"Best Place to Work 50!");
CVFile f20_1 = new CVFile(
"D:\\File20_1.txt", "Welcome to Commvault 20!");
sm.CVDisplayStats();
CVFile f60 = new CVFile("D:\\File60.txt",
"All THE Best 60!");
CVFile f70 = new CVFile("D:\\File70.txt",
"All The Best 70!");
CVFile f70_1
= new CVFile("D:\\File70.txt", "Commvault 70!");
sm.CVDisplayStats();
fx = sm.CVGetFile("D:\\File60.txt");
if (null != fx) {
fx.CVReadFile(-5, contentInFile);
System.out.println(contentInFile);
}
f4.CVModifyFile("Welcome to Commvault 4!");
fx = sm.CVGetFile("C:\\File4.txt");
if (null != fx) {
fx.CVReadFile(0, contentInFile);
System.out.println(contentInFile);
}
fx = sm.CVGetFile("C:\\File4.txt");
if (null != fx) {
fx.CVReadFile(-1, contentInFile);
System.out.println(contentInFile);
}
sm.CVDisplayStats();
sm.CVMoveFile("C:\\File9.txt", "D:\\File30.txt");
sm.CVMoveFile("C:\\File4.txt", "D:\\File2.txt");
sm.CVDisplayStats();
sm.CVCopyFile("C:\\File4.txt", "D:\\File21.txt");
sm.CVCopyFile("C:\\File3.txt", "C:\\File40.txt");
sm.CVDisplayStats();
sm.CVDeleteFile("D:\\File20.txt");
sm.CVDisplayStats();
sm.CVDeleteFile("C:\\File1.txt");
sm.CVDeleteFile("C:\\File4.txt");
sm.CVDisplayStats();
sm.CVDeleteFile("D:\\File7.txt");
sm.CVDeleteFile("D:\\File70.txt");
sm.CVDeleteFile("D:\\File30.txt");
sm.CVDisplayStats();不幸的是，没有人被选中参加面试。
祝一切顺利！