code: all string problems included

Filter.java

@@ -0,0 +1,17 @@
+public class Filter {
+
+    public static void filterdArray(int[] arr) {
+        //! filtering process
+        for(int i = 0; i < arr.length - 1; i++) {
+            if(arr[i] % 2 != 0)
+                System.out.print(arr[i] + " ");
+        }
+    }
+
+
+
+    public static void main(String[] args) {
+        int[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+        filterdArray(arr);
+    }
+}

Java DSA.iml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/Java-Programs" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

Max.java

@@ -0,0 +1,16 @@
+public class Max {
+    public static void max(int[] arr) {
+        int max = 0;
+        for(int i = 0; i < arr.length; i++) {
+            if(arr[i] > max)
+                max = arr[i];
+        }
+
+        System.out.println(max);
+    }
+
+    public static void main(String[] args) {
+        int[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+        max(arr);
+    }
+}

Practice.java

@@ -0,0 +1,55 @@
+import java.util.*;
+
+class Practice {
+  public static void main(String[] args) {
+    ArrayList<Integer> arr = new ArrayList<>();
+
+    arr.add(4);
+    arr.add(5);
+    arr.add(8);
+    arr.add(9);
+    arr.add(3);
+    arr.add(7);
+
+    int target = 4;
+
+    for (int i = 0; i < arr.size(); i++) {
+      if (arr.get(i) == target) {
+        arr.remove(arr.get(i));
+      }
+    }
+
+    int first = 0;
+    int end = arr.size() - 1;
+    int mid = (first + end) / 2;
+
+    while (mid < end) {
+      if (arr.get(first) < arr.get(mid)) {
+        first++;
+      }
+
+      if (arr.get(first) > arr.get(mid)) {
+        int temp = arr.get(first);
+        arr.add(first, arr.get(mid));
+        arr.add(mid, temp);
+
+        first++;
+      }
+
+      if (arr.get(mid) < arr.get(end)) {
+        end--;
+      }
+
+      if (arr.get(mid) > arr.get(end)) {
+        int temp = arr.get(mid);
+        arr.add(mid, arr.get(end));
+        arr.add(end, temp);
+
+        end--;
+      }
+    }
+
+    System.out.println("List" + arr);
+    System.out.println("Sorted List" + arr);
+  }
+}

Sum_Array.java

@@ -0,0 +1,14 @@
+public class Sum_Array {
+    public static void sum(int[] array) {
+        int sum = 0;
+        for(int i = 0; i < array.length - 1; i++) {
+            sum += array[i];
+        }
+        System.out.println(sum);
+    }
+
+    public static void main(String[] args) {
+        int[] array = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+        sum(array);
+    }
+}

arrays/Array_Problem_10.java

@@ -3,49 +3,55 @@
 import java.io.*;
 
 /*
- *  Problem :- 
+ *  Problem :-
  *   Minimum no of jumps to reach end of an arrays.array
  */
 
-/* 
- * Understanding of The Problem: - 
- * 
+/*
+ * Understanding of The Problem: -
+ *
  * Given an arrays.array of integers where each element represents the max number of steps that can be made forward from the element
  * Write a function to return the minimum no of jumps to reach the end of the arrays.array(starting from the first element).
  * If an element is 0, they cannot move through that element.
  */
 @SuppressWarnings("unused")
 public class Array_Problem_10 {
-
-	static int minJumps(int arr[] , int l , int h) {
-
-		//Base case: when source & destination are same
-		if(h == l)
-			return 0;
-
-		//When nothing is reachable from the given source
-		if(arr[l] == 0)		
-			return Integer.MAX_VALUE;
-
-		/*
+
+	// Function to find the minimum number of jumps required to reach the end of the array
+    public static int findMinimumJumps(int[] jumpDistances, int startingIndex, int endingIndex) {
+        // Base case: destination reached from the source itself
+        if (startingIndex == endingIndex) {
+            return 0;
+        }
+
+        // Base case: no jump possible from the source
+        if (jumpDistances[startingIndex] == 0) {
+            return Integer.MAX_VALUE;
+        }
+
+	/*
 		 * Traverse through all the points reachable from arrays.array[1].
 		 * Recursively get the minimum number of jumps needed to reach arrays.array[h] from these reachable points.
 		 */
-
-		int min = Integer.MAX_VALUE;
-		for(int i = l + 1 ; i <= h 
-				&& i<= l + arr[l] ; i++) {
-			int jumps = minJumps(arr , i , h);
-			if(jumps != Integer.MAX_VALUE	  &&	  jumps + 1 < min)	
-				min = jumps + 1 ;
-		}
-		return min;
-	}
-
-	public static void main(String[] args) {
-		int arr[] = { 1, 3, 6, 3, 2, 3, 6, 8, 9, 5 };
-		int n = arr.length;
-		System.out.print("Minimum number of jumps to reach end is " + minJumps(arr , 0 , n -1 ));
-	}
+        // Explore all reachable destinations from the current position
+        int minJumps = Integer.MAX_VALUE;
+        for (int nextIndex = startingIndex + 1; nextIndex <= endingIndex && nextIndex <= startingIndex + jumpDistances[startingIndex]; nextIndex++) {
+            int jumpsFromNextIndex = findMinimumJumps(jumpDistances, nextIndex, endingIndex);
+
+            // Update minimum jumps if a valid path is found
+            if (jumpsFromNextIndex != Integer.MAX_VALUE && jumpsFromNextIndex + 1 < minJumps) {
+                minJumps = jumpsFromNextIndex + 1;
+            }
+        }
+
+        return minJumps;
+    }
+
+    public static void main(String[] args) {
+        int[] jumpDistances = {1, 3, 6, 3, 2, 3, 6, 8, 9, 5};
+        int numberOfElements = jumpDistances.length;
+
+        System.out.println("Minimum number of jumps to reach the end: " + findMinimumJumps(jumpDistances, 0, numberOfElements - 1));
+    }
 
 }

arrays/Array_Problem_17.java

@@ -1,25 +1,25 @@
 package arrays;
 
-//? Problem Title :-> Best Time to buy and sell stocks [1] 
+//? Problem Title :-> Best Time to buy and sell stocks [1]
 
 // * You are allowed to buy and sell only once
-// ! You are not allowed to sell first and then buy, 
+// ! You are not allowed to sell first and then buy,
 // ! (you must buy first and then sell)
 
 public class Array_Problem_17 {
 
-  public int maxProfit(int[] prices) {
+  public static int maxProfit(int[] prices) {
     int mini = prices[0];
     int maxProfit = 0;
-    
-    int n = prices.size();
+
+    int n = prices.length;
 
     for(int i = 0; i < n; i++) {
       int cost = prices[i] - mini;
       maxProfit = Math.max(maxProfit, cost);
       mini = Math.min(mini, prices[i]);
     }
-    
+
     return maxProfit;
   }
 

arrays/Array_Problem_19.java

@@ -1,41 +1,42 @@
 package arrays;
 
-/* Problem Title :-> find common elements in 3 sorted arrays */
+/* Problem Title: Find common elements in 3 sorted arrays */
 public class Array_Problem_19 {
-    // This function prints common elements in a1
-    void findCommon(int[] a1, int[] a2, int[] a3) {
-        // Initialize starting indexes for a1[], a2[] and a3[]
-        int i = 0, j = 0, k = 0;
-        // Iterate through three arrays while all arrays have elements
-        while (i < a1.length && j < a2.length && k < a3.length) {
-            // if x = y and y = z, print any of them and move ahead in all arrays
-            if (a1[i] >= a2[j] && a2[j] == a3[k]) {
-                System.out.print(a1[i] + " ");
-                i++;
-                k++;
+
+    // This function prints common elements in firstArray
+    void findCommon(int[] firstArray, int[] secondArray, int[] thirdArray) {
+        // Initialize starting indices for arrays
+        int firstIndex = 0, secondIndex = 0, thirdIndex = 0;
+
+        // Iterate through arrays while all have elements
+        while (firstIndex < firstArray.length && secondIndex < secondArray.length && thirdIndex < thirdArray.length) {
+            // If elements are equal, print any and move forward in all arrays
+            if (firstArray[firstIndex] == secondArray[secondIndex] && secondArray[secondIndex] == thirdArray[thirdIndex]) {
+                System.out.print(firstArray[firstIndex] + " ");
+                firstIndex++;
+                thirdIndex++;
+            } else if (firstArray[firstIndex] < secondArray[secondIndex]) {
+                // First element is smaller, so move its index
+                firstIndex++;
+            } else if (secondArray[secondIndex] < thirdArray[thirdIndex]) {
+                // Second element is smaller, so move its index
+                secondIndex++;
+            } else {
+                // Third element is smaller, so move its index
+                thirdIndex++;
             }
-            // x < y
-            else if (a1[j] < a2[j])
-                i++;
-            // y < z
-            else if (a2[j] < a3[k])
-                j++;
-            // we reach here whem x > y and z < y, i.e., z is smallest
-            else
-                k++;
         }
     }
 
     /* Driver Code */
     public static void main(String[] args) {
 
-        Array_Problem_19 ob = new Array_Problem_19();
-        int a1[] = { 1, 5, 10, 20, 40, 80 };
-        int a2[] = { 6, 7, 20, 80, 100 };
-        int a3[] = { 3, 4, 15, 20, 30, 70, 80, 120 };
-
+        Array_Problem_19 object = new Array_Problem_19();
+        int[] firstArray = {1, 5, 10, 20, 40, 80};
+        int[] secondArray = {6, 7, 20, 80, 100};
+        int[] thirdArray = {3, 4, 15, 20, 30, 70, 80, 120};
 
         System.out.print("Common elements are ");
-        ob.findCommon(a1, a2, a3);
+        object.findCommon(firstArray, secondArray, thirdArray);
     }
 }