finding sum of elements of an unsorted array

find_sum_pair.cpp

@@ -0,0 +1,27 @@
+#include<iostream>
+#include<algorithm>
+using namespace std;
+
+// in unsorted array
+
+int main () {
+    int arr[] = {2,3,1,6,5,4};
+    int sum = 9;
+    int n = sizeof(arr)/sizeof(int);
+    int i = 0 , j=n-1;
+    sort(arr,arr+n);
+    while(i<j) {
+        if(arr[i] + arr[j]==sum) {
+            cout<<arr[i]<<" "<<arr[j]<<endl;
+            i++;
+            j--;
+        }
+        else if(arr[i]+arr[j]>sum) {
+            j--;
+        }
+        else if(arr[i]+ arr[j]<sum) {
+            i++;
+        }
+    }
+    return 0;
+}