adding the leetcode and singlelinkedlist changes

Recursion/BinarySum.java

@@ -0,0 +1,32 @@
+import java.math.BigInteger;
+
+public class BinarySum {
+
+    /*
+     * Given two binary strings a and b, return their sum as a binary string.
+
+ 
+
+Example 1:
+
+Input: a = "11", b = "1"
+Output: "100"
+Example 2:
+
+Input: a = "1010", b = "1011"
+Output: "10101"
+     * 
+     */
+    public static void main(String[] args) {
+        var classname = new BinarySum();
+        System.out.println(classname.addBinary("1010",  "1011"));
+    }
+
+    public String addBinary(String a, String b) {
+        BigInteger x = new BigInteger(a, 2);
+        BigInteger y = new BigInteger(b, 2);
+        BigInteger sum = x.add(y);
+        return sum.toString(2);
+    }
+
+}

Recursion/FindSqrt.java

@@ -0,0 +1,35 @@
+import java.math.BigInteger;
+
+public class FindSqrt {
+
+
+    public static void main(String[] args) {
+
+
+    }
+
+    public int mySqrt(int x) {
+        BigInteger c = BigInteger.valueOf(x);
+        return c.sqrt().intValue();
+    }
+
+    public int mySqrt2(int x) {
+        if(x == 0){
+            return 0;
+        }
+        int start = 1;
+        int end = x;
+        int ans = 0;
+        while(start <= end){
+            int mid = start + (end-start)/2;
+			//instead of mid*mid we are giving x/mid to tackle overflow of integer range when multiplying with bigger numbers
+            if(mid <= x/mid){
+                ans = mid;
+                start = mid + 1;
+            }else{
+                end = mid -1;
+            }
+        }
+        return ans;
+    }
+}

SinglyLinkedList/SinglyLinkedList.java

@@ -53,7 +53,7 @@ else if(location>=size){
 
  public void traverseLinkedList(Node head){
         if(head==null){
-            System.out.println("The hea is null and there is no Linked List linked to it");
+            System.out.println("The head is null and there is no Linked List linked to it");
             return;
         }
 
@@ -139,4 +139,13 @@ else if(location==size){
 
     }
  }
+
+ public void deleteSingleLinkedList(){
+    if(head==null) System.out.println("the single linked list is already empty");
+    else {
+        head=null;tail=null;
+        System.out.println("Single linked list is deleted");
+    }
+    return;
+ }
 }

SinglyLinkedList/testsinglelinkedlist.java

@@ -17,5 +17,7 @@ public static void main(String[] args) {
         s.searchValueInLinkedList(10);
         s.deleteNode(4);
         s.traverseLinkedList(s.head);
+        s.deleteSingleLinkedList();
+        s.traverseLinkedList(s.head);
     }
 }