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LeetCode #21: Merge Two Sorted Lists

Oct 15, 2022CodeCatch
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Quine-McCluskey Tabular Method

Feb 3, 2021C S

1 like • 2 views

import java.util.ArrayList;
import java.util.Iterator;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
char[] variables = setVariables(in);
int[] minTerms = setMinTerms(in);
String[] binaryMinTerms = decimalToBinary(variables, minTerms);
ArrayList<Group> groups = computeSuccessiveGroups(minTerms, binaryMinTerms);
displayInput(variables, minTerms);
printPIs(groups, variables);
}
private static char[] setVariables(Scanner in) {
System.out.print("Enter the number of variables: ");
int numVariables = in.nextInt();
char[] variables = new char[numVariables];
System.out.print("Enter each variable separated by spaces: ");
for(int i = 0; i < numVariables; i++) {
variables[i] = in.next().charAt(0);
}
return variables;
}
private static int[] setMinTerms(Scanner in) {
System.out.print("Enter the number of min terms: ");
int numMinTerms = in.nextInt();
int[] minTerms = new int[numMinTerms];
System.out.print("Enter each min term separated by spaces: ");
for(int i = 0; i < numMinTerms; i++) {
minTerms[i] = in.nextInt();
}
return minTerms;
}
private static String[] decimalToBinary(char[] variables, int[] minTerms) {
String[] binaryMinTerms = new String[minTerms.length];
for(int i = 0; i < minTerms.length; i++) {
binaryMinTerms[i] = Integer.toBinaryString(minTerms[i]);
if(binaryMinTerms[i].length() < variables.length) {
String zeros = "";
int len = binaryMinTerms[i].length();
while(len < variables.length) {
zeros = zeros.concat("0");
len++;
}
binaryMinTerms[i] = zeros + binaryMinTerms[i];
}
}
return binaryMinTerms;
}
private static void displayInput(char[] variables, int[] minTerms) {
System.out.print("Function: f(");
for(int i = 0; i < variables.length; i++) {
if(i == variables.length-1)
System.out.print(variables[i]);
else
System.out.print(variables[i] + ", ");
}
System.out.print(") = SIGMAm(");
for(int i = 0; i < minTerms.length; i++) {
if(i == minTerms.length-1)
System.out.print(minTerms[i]);
else
System.out.print(minTerms[i] + ", ");
}
System.out.println(")");
}
private static ArrayList<Group> computeSuccessiveGroups(int[] minTerms, String[] binaryMinTerms) {
ArrayList<Group> groups = new ArrayList<Group>();
for(int i = 0; i < minTerms.length; i++)
groups.add(new Group(Integer.toString(minTerms[i]), binaryMinTerms[i]));
int sizeBeforeRemoval = 0, currentSize;
while(sizeBeforeRemoval != groups.size()) {
currentSize = groups.size();
for(int i = 0; i < currentSize; i++) {
for(int j = i+1; j < currentSize; j++) {
if(differences(groups.get(i).binary, groups.get(j).binary) == 1) {
String combinedBin = combineBinary(groups.get(i).binary, groups.get(j).binary);
groups.get(i).grouped = true;
groups.get(j).grouped = true;
if(isUniqueBin(groups, combinedBin)) {
String newTuple = groups.get(i).decimal + "," + groups.get(j).decimal;
groups.add(new Group(newTuple, combinedBin));
}
else break;
}
}
}
sizeBeforeRemoval = groups.size();
Iterator<Group> iter = groups.iterator();
while(iter.hasNext()) {
Group next = iter.next();
if(next.grouped)
iter.remove();
}
}
return groups;
}
private static int differences(String a, String b) {
int diff = 0;
for(int i = 0; i < a.length(); i++)
if(a.charAt(i) != b.charAt(i))
diff++;
return diff;
}
private static String combineBinary(String a, String b) {
String combined = "";
for(int i = 0; i < a.length(); i++) {
if(a.charAt(i) != b.charAt(i))
combined = combined.concat("-");
else
combined = combined.concat(Character.toString(a.charAt(i)));
}
return combined;
}
private static boolean isUniqueBin(ArrayList<Group> groups, String s) {
for(int i = 0; i < groups.size(); i++)
if(groups.get(i).binary.equals(s))
return false;
return true;
}
private static void printPIs(ArrayList<Group> groups, char[] variables) {
System.out.println("Prime Implicants: ");
for(int i = 0; i < groups.size(); i++)
System.out.println(groups.get(i).decimal + " | " + binaryToMinTerm(variables, groups.get(i).binary));
}
private static String binaryToMinTerm(char[] variables, String s) {
String minTerm = "";
for(int i = 0; i < s.length(); i++) {
if(s.charAt(i) != '-') {
if(s.charAt(i) == '0')
minTerm = minTerm.concat(Character.toString(variables[i]) + "'");
else
minTerm = minTerm.concat(Character.toString(variables[i]));
}
}
return minTerm;
}
}

Factorial

Nov 19, 2022CodeCatch

0 likes • 0 views

public class Factorial
{
public static void main(String[] args)
{ final int NUM_FACTS = 100;
for(int i = 0; i < NUM_FACTS; i++)
System.out.println( i + "! is " + factorial(i));
}
public static int factorial(int n)
{ int result = 1;
for(int i = 2; i <= n; i++)
result *= i;
return result;
}
}

Send Email from Java

Nov 19, 2022CodeCatch

0 likes • 5 views

import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
public void postMail( String recipients[ ], String subject, String message , String from) throws MessagingException
{
boolean debug = false;
//Set the host smtp address
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.example.com");
// create some properties and get the default Session
Session session = Session.getDefaultInstance(props, null);
session.setDebug(debug);
// create a message
Message msg = new MimeMessage(session);
// set the from and to address
InternetAddress addressFrom = new InternetAddress(from);
msg.setFrom(addressFrom);
InternetAddress[] addressTo = new InternetAddress[recipients.length];
for (int i = 0; i < recipients.length; i++)
{
addressTo[i] = new InternetAddress(recipients[i]);
}
msg.setRecipients(Message.RecipientType.TO, addressTo);
// Optional : You can also set your custom headers in the Email if you Want
msg.addHeader("MyHeaderName", "myHeaderValue");
// Setting the Subject and Content Type
msg.setSubject(subject);
msg.setContent(message, "text/plain");
Transport.send(msg);
}

longest sequence

Oct 7, 2023AustinLeath

0 likes • 5 views

import java.util.Arrays;
public class LongestIncreasingSubsequence {
public int lengthOfLIS(int[] nums) {
if (nums.length == 0) {
return 0;
}
int[] dp = new int[nums.length];
Arrays.fill(dp, 1); // Initialize all elements in dp array to 1, as each element itself is a valid subsequence of length 1.
int maxLength = 1; // Initialize the maximum length to 1, considering a single element as the sequence.
for (int i = 1; i < nums.length; i++) {
for (int j = 0; j < i; j++) {
if (nums[i] > nums[j]) {
dp[i] = Math.max(dp[i], dp[j] + 1); // If nums[i] is greater than nums[j], update the longest subsequence length ending at i.
}
}
maxLength = Math.max(maxLength, dp[i]); // Update the maximum length if needed.
}
return maxLength;
}
public static void main(String[] args) {
LongestIncreasingSubsequence lis = new LongestIncreasingSubsequence();
int[] nums = {10, 9, 2, 5, 3, 7, 101, 18};
int result = lis.lengthOfLIS(nums);
System.out.println("Length of the Longest Increasing Subsequence: " + result); // Output: 4
}
}

try-catch modularity

Jan 31, 2023AustinLeath

0 likes • 0 views

public class UserService {
private UserRepository userRepository;
public UserService(UserRepository userRepository) {
this.userRepository = userRepository;
}
public User getUserById(long id) {
try {
return userRepository.getUserById(id);
} catch (Exception e) {
// Log the exception here
System.out.println("An error occurred while fetching the user: " + e.getMessage());
return null;
}
}
}
public class UserRepository {
public User getUserById(long id) throws Exception {
// Database query to fetch the user
if (id < 0) {
throw new Exception("Invalid user id");
}
// Return the user object
return new User(id, "John Doe");
}
}
public class User {
private long id;
private String name;
public User(long id, String name) {
this.id = id;
this.name = name;
}
public long getId() {
return id;
}
public String getName() {
return name;
}
}
public static void enu2ecefCov(GMatrix ecefCov, GMatrix enuCov, LLA refLLA) {
double lambda = refLLA.longitude;
double phi = refLLA.latitude;
GMatrix R = new GMatrix(6, 6);
GMatrix Rt = new GMatrix(6, 6);
GMatrix tmp1 = new GMatrix(6, 6);
GMatrix tmp2 = new GMatrix(6, 6);
R.setElement(0, 0, -Math.sin(lambda));
R.setElement(0, 1, -Math.sin(phi)*Math.cos(lambda));
R.setElement(0, 2, Math.cos(phi)*Math.cos(lambda));
R.setElement(1, 0, Math.cos(lambda));
R.setElement(1, 1, -Math.sin(phi)*Math.sin(lambda));
R.setElement(1, 2, Math.cos(phi)*Math.sin(lambda));
R.setElement(2, 0, 0);
R.setElement(2, 1, Math.cos(phi));
R.setElement(2, 2, Math.sin(phi));
R.setElement(3, 3, -Math.sin(lambda));
R.setElement(3, 4, -Math.sin(phi)*Math.cos(lambda));
R.setElement(3, 5, Math.cos(phi)*Math.cos(lambda));
R.setElement(4, 3, Math.cos(lambda));
R.setElement(4, 4, -Math.sin(phi)*Math.sin(lambda));
R.setElement(4, 5, Math.cos(phi)*Math.sin(lambda));
R.setElement(5, 3, 0);
R.setElement(5, 4, Math.cos(phi));
R.setElement(5, 5, Math.sin(phi));
Rt.transpose(R);
tmp1.mul(enuCov, R);
ecefCov.mul(Rt, tmp1);
}