Revert "fix: remove redundant comment"

This reverts commit 959c579550.

src/main/java/BonusExercises.java

@@ -1,6 +1,3 @@
-import java.time.LocalDate;
-import java.time.format.DateTimeFormatter;
-import java.time.format.DateTimeParseException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.regex.Matcher;
@@ -23,51 +20,11 @@ public class BonusExercises {
             - Each segment (between dots) must follow same hyphen rules
      */
     public boolean validateEmail(String email) {
+        String regex = ""; // todo
+        Pattern pattern = Pattern.compile(regex);
+        Matcher matcher = pattern.matcher(email);
 
-
+        return matcher.matches();
-        if (email.contains(" "))
-            return false;
-
-        int count = 0;
-        int index = 0;
-
-        // rule 1:
-        for (int i = 0; i < email.length() -1; i++)  {
-
-            if (email.charAt(i) == '@') {
-                count++;
-                index = i;
-            }
-        }
-
-        if (count != 1)
-            return false;
-
-
-
-
-        // rule 2:
-        String localPart = email.substring(0,index);
-        String domainPart = email.substring(index + 1);
-
-
-        if (localPart.isEmpty() || domainPart.isEmpty())
-            return false;
-
-        if (localPart.startsWith(".") || localPart.endsWith(".") ||
-                domainPart.startsWith(".") || domainPart.endsWith("."))
-            return false;
-
-        if (localPart.contains(".."))
-            return false;
-
-        if (domainPart.contains("_"))
-            return false;
-
-
-        
-
-        return true;
     }
 
     /*
@@ -82,7 +39,7 @@ public class BonusExercises {
         If no match for a date is found in the string, return null.
     */
     public String findDate(String string) {
-
+        // todo
         return null;
     }
 
@@ -97,42 +54,8 @@ public class BonusExercises {
         - has no white-space in it
      */
     public int findValidPasswords(String string) {
-
+        // todo
-        if (string.length() < 8)
+        return -1;
-            return 0;
-
-        int validPassWords = 0;
-
-        List<String> subStrings = List.of(string.split("\\s+"));
-
-
-        for (String newPart : subStrings) {
-
-            //at least 8 characters
-            if (newPart.length() < 8)
-                continue;
-
-
-            // at least one uppercase letter
-            if (!newPart.matches(".*[A-Z].*"))
-                continue;
-
-            // and at least a lowercase
-            if (!newPart.matches(".*[a-z].*"))
-                continue;
-
-            // at least one number
-            if (!newPart.matches(".*\\d.*"))
-                continue;
-
-            // at least one spacial character
-            if (!newPart.matches(".*[!@#$%^&*].*"))
-                continue;
-
-            validPassWords++;
-        }
-
-            return validPassWords;
     }
 
     /*
@@ -143,29 +66,11 @@ public class BonusExercises {
      */
     public List<String> findPalindromes(String string) {
         List<String> list = new ArrayList<>();
-
+        // todo
-        Pattern words = Pattern.compile("[a-zA-Z]+");
-        Matcher matcher = words.matcher(string);
-
-        while (matcher.find()) {
-
-            String word = matcher.group();
-
-            if (word.length() < 2)
-                continue;
-
-            String reversed = new StringBuilder(word).reverse().toString();
-
-            if (reversed.equalsIgnoreCase(word))
-                list.add(word);
-
-        }
-
         return list;
     }
 
     public static void main(String[] args) {
         // you can test your code here
-        
     }
 }

src/main/java/MainExercises.java

@@ -1,6 +1,3 @@
-import java.util.ArrayList;
-import java.util.List;
-
 public class MainExercises
 {
     /*
@@ -23,23 +20,8 @@ public class MainExercises
  */
     public char[][] generateTriangle(int n) {
 
-        char[][] triangle = new char[n][];
+        // todo
-
+        return null;
-        for (int i = 0 ; i < n ; i++)
-            triangle[i] = new char[i +1];
-
-        for (int i = 0 ; i < n ; i++) {
-
-            for (int j = 0 ; j <= i ; j++) {
-
-                if (i == 0 || i == n - 1 || j == 0 || j == i)
-                    triangle[i][j] = '*';
-                else
-                    triangle[i][j] = ' ';
-            }
-        }
-
-        return triangle;
 
     }
 
@@ -76,51 +58,10 @@ public class MainExercises
            - Number of columns: matrix[0].length (if rectangular)
    */
     public int[] spiralTraversal(int[][] matrix) {
-
+        // todo
-        if ((matrix == null) || (matrix.length == 0) || (matrix[0].length == 0)) {
+        return null;
-            return new int[0];
     }
 
-        int rows = matrix.length;
-        int cols = matrix[0].length;
-        List<Integer> resultList = new ArrayList<>();
-
-        int top = 0, bottom = rows - 1, left = 0, right = cols - 1;
-
-        while (top <= bottom && left <= right) {
-
-            for (int i = left; i <= right; i++) {
-                resultList.add(matrix[top][i]);
-            }
-            top++;
-            for (int i = top; i <= bottom; i++) {
-                resultList.add(matrix[i][right]);
-            }
-            right--;
-
-            if (top <= bottom) {
-                for (int i = right; i >= left; i--) {
-                    resultList.add(matrix[bottom][i]);
-                }
-                bottom--;
-            }
-
-            if (left <= right) {
-                for (int i = bottom; i >= top; i--) {
-                    resultList.add(matrix[i][left]);
-                }
-                left++;
-            }
-        }
-        int[] resultArray = new int[resultList.size()];
-        for (int i = 0; i < resultList.size(); i++) {
-            resultArray[i] = resultList.get(i);
-        }
-
-        return resultArray;
-    }
-
-
     /*
         integer partitioning is a combinatorics problem in discreet maths
         the problem is to generate sum numbers which their summation is the input number
@@ -149,56 +90,13 @@ public class MainExercises
         body to use them instead of arrays.
     */
 
-
     public int[][] intPartitions(int n) {
-        if (n <= 0) {
+        // todo
-            return new int[0][0];
+        return null;
-        }
-
-        List<List<Integer>> allPartitions = new ArrayList<>();
-        List<Integer> newPartition = new ArrayList<>();
-
-
-        generatePartitions(n, n, newPartition, allPartitions); // using recursion
-
-
-        int[][] result = new int[allPartitions.size()][];
-
-        // Convert List<List<Integer>> to int[][]
-        for (int i = 0; i < allPartitions.size(); i++) {
-
-            List<Integer> partition = allPartitions.get(i);
-            result[i] = new int[partition.size()];
-
-            for (int j = 0; j < partition.size(); j++) {
-                result[i][j] = partition.get(j);
-            }
-        }
-        return result;
-    }
-
-    private void generatePartitions(int n, int maxVal, List<Integer> newPartition, List<List<Integer>> allPartitions) {
-        // Base case: If n becomes 0, we have found a valid partition
-        if (n == 0) {
-            // Add a copy of the current partition to the list of all partitions
-            allPartitions.add(new ArrayList<>(newPartition));
-            return;
-        }
-
-        for (int i = Math.min(n, maxVal); i >= 1; i--) {
-            // Add the current number 'i' to the partition
-            newPartition.add(i);
-
-            // The new maxVal becomes 'i' because the next number cannot be larger than 'i'
-            generatePartitions(n - i, i, newPartition, allPartitions);
-
-            // Remove the last added number 'i' to explore other possibilities
-            newPartition.removeLast();
-        }
     }
 
 
-    static void main()
+    public static void main()
     {
 
     }