From 154e6a0e61635a576e6d3c74855d9efa807d0f9f Mon Sep 17 00:00:00 2001
From: Evan Ferrao <evanferrao@gmail.com>
Date: Wed, 7 Aug 2024 23:48:47 +0530
Subject: [PATCH] day2: array manipulation 1

---
 ...TotalNumberOfParirsWhoseSumIsEqualToX.java | 29 +++++++++++++++
 ...talNumberOfTripletsWhoseSumIsEqualToX.java | 32 +++++++++++++++++
 Basic/UniqueArrayElement.java                 | 36 +++++++++++++++++++
 3 files changed, 97 insertions(+)
 create mode 100644 Basic/TotalNumberOfParirsWhoseSumIsEqualToX.java
 create mode 100644 Basic/TotalNumberOfTripletsWhoseSumIsEqualToX.java
 create mode 100644 Basic/UniqueArrayElement.java

diff --git a/Basic/TotalNumberOfParirsWhoseSumIsEqualToX.java b/Basic/TotalNumberOfParirsWhoseSumIsEqualToX.java
new file mode 100644
index 0000000..fe058d4
--- /dev/null
+++ b/Basic/TotalNumberOfParirsWhoseSumIsEqualToX.java
@@ -0,0 +1,29 @@
+// write a code in java to find the total number of pairs whose sum is equal to a given number using function
+import java.util.Scanner;
+class TotalNumberOfParirsWhoseSumIsEqualToX{
+    public static void main(String[] args){
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter the size of the array");
+        int n = sc.nextInt();
+        int[] arr = new int[n];
+        System.out.println("Enter the elements of the array");
+        for(int i=0;i<n;i++){
+            arr[i] = sc.nextInt();
+        }
+        System.out.println("Enter the value of x");
+        int x = sc.nextInt();
+        System.out.println("The total number of pairs whose sum is equal to "+x+" is "+totalPairs(arr,n,x));
+        sc.close();
+    }
+    public static int totalPairs(int[] arr,int n,int x){
+        int count = 0;
+        for(int i=0;i<n;i++){
+            for(int j=i+1;j<n;j++){
+                if(arr[i]+arr[j]==x){
+                    count++;
+                }
+            }
+        }
+        return count;
+    }
+}
\ No newline at end of file
diff --git a/Basic/TotalNumberOfTripletsWhoseSumIsEqualToX.java b/Basic/TotalNumberOfTripletsWhoseSumIsEqualToX.java
new file mode 100644
index 0000000..537598e
--- /dev/null
+++ b/Basic/TotalNumberOfTripletsWhoseSumIsEqualToX.java
@@ -0,0 +1,32 @@
+// write a code in java to find the total number of triplets whose sum is equal to a given number using function
+import java.util.Scanner;
+class TotalNumberOfTripletsWhoseSumIsEqualToX{
+    public static void main(String[] args){
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter the size of the array");
+        int n = sc.nextInt();
+        int arr[] = new int[n];
+        System.out.println("Enter the elements of the array");
+        for(int i=0;i<n;i++){
+            arr[i] = sc.nextInt();
+        }
+        System.out.println("Enter the value of x");
+        int x = sc.nextInt();
+        System.out.println("The total number of triplets whose sum is equal to "+x+" is "+countTriplets(arr,n,x));
+        sc.close();
+    }
+
+    static int countTriplets(int arr[],int n,int x){
+        int count = 0;
+        for(int i=0;i<n-2;i++){
+            for(int j=i+1;j<n-1;j++){
+                for(int k=j+1;k<n;k++){
+                    if(arr[i]+arr[j]+arr[k]==x){
+                        count++;
+                    }
+                }
+            }
+        }
+        return count;
+    }
+}
\ No newline at end of file
diff --git a/Basic/UniqueArrayElement.java b/Basic/UniqueArrayElement.java
new file mode 100644
index 0000000..a644e16
--- /dev/null
+++ b/Basic/UniqueArrayElement.java
@@ -0,0 +1,36 @@
+// find the unique number in a givern array wherer all the elements are being twive with one value being unique using function
+
+import java.util.Scanner;
+class UniqueArrayElement{
+    public static void main(String[] args){
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter the number of elements in the array");
+        int n = sc.nextInt();
+        int[] arr = new int[n];
+        System.out.println("Enter the elements of the array");
+        for(int i=0;i<n;i++){
+            arr[i] = sc.nextInt();
+        }
+        System.out.println("The unique element in the array is "+findUnique(arr));
+    }
+    public static int findUnique(int[] arr){
+        int res = 0;
+        for(int i=0;i<arr.length;i++){
+            res = res^arr[i];
+        }
+        return res;
+    }
+
+    // dry run: 
+    // arr = [1,2,3,4,1,2,3]
+    // res = 0
+    // res = 0^1 = 1
+    // res = 1^2 = 3
+    // res = 3^3 = 0
+    // res = 0^4 = 4
+    // res = 4^1 = 5
+    // res = 5^2 = 7
+    // res = 7^3 = 4
+    // return 4
+
+}
\ No newline at end of file