merge_two_sorted_arrays.cpp file added

Author: kiruba-r11

Arrays/merge_two_sorted_arrays.cpp

@@ -0,0 +1,76 @@
+// Problem - Merge two sorted arrays without using extra space
+// Since, extra space should not be used, use the input arrays itself to perform this task
+// For example: If the input array is, 
+//	a = [0 , 2 , 4 , 6 , 8]
+//	b = [1 , 3 , 5 , 7]
+// The output arrays should be,
+//	a = [0 , 1 , 2 , 3 , 4]
+//	b = [5 , 6 , 7 , 8]
+
+// Sample Input - 1
+//	a = [5 , 8 , 9 , 10]
+//	b = [1 , 2 , 100]
+
+// Sample Output - 1
+//	a = [1 , 2 , 5 , 8]
+// b = [9 , 10 , 100]
+
+// Time Complexity: O(nlogn)
+// Auxiliary Space Complexity: O(1)
+
+#include <iostream>
+#include <vector>
+#include <algorithm>
+using namespace std;
+
+// Function to merge two arrays without extra space
+void merge_two_arrays(vector <int> &arr1 , vector <int> &arr2) {
+
+int i = arr1.size() - 1 , j = 0;
+
+while(true) {
+if(arr1[i] > arr2[j]) {
+swap(arr1[i] , arr2[j]);
+sort(arr1.begin() , arr1.end());
+sort(arr2.begin() , arr2.end());
+} else {
+break;
+}
+}
+
+}
+
+int main() {
+
+int n1 , n2;
+cout << "Enter the size of the first array : " << endl;
+cin >> n1;
+
+cout << "Enter the size of the second array : " << endl;
+cin >> n2;
+
+vector <int> arr1(n1) , arr2(n2);
+
+cout << "Enter the elements of first array in sorted order : " << endl;
+for(int i = 0; i < n1; i++) {
+cin >> arr1[i];
+}
+
+cout << "Enter the elements of second array in sorted order : " << endl;
+for(int i = 0; i < n2; i++) {
+cin >> arr2[i];
+}
+
+merge_two_arrays(arr1 , arr2);
+
+cout << "After merging : " << endl;
+for(int i = 0; i < n1; i++) {
+cout << arr1[i] << " ";
+}
+for(int i = 0; i < n2; i++) {
+cout << arr2[i] << " ";
+}
+cout << endl;
+
+return 0;
+}