added questions

Author: deveshsangwan

.gitignore

@@ -1,3 +1,4 @@
 # Don't track content of these folders
 /.vscode/
 # Compiled source #
+*.out

prerequisites/even_and_odd_indexes.cpp

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+/*
+Given an array of integers, print two integer values:
+First, the sum of all numbers which are even as well as whose index are even.
+Second, the sum of all numbers which are odd as well as whose index are odd.
+Print the two integers space separated. (Arrays is 0-indexed)
+Input:
+Given an integer denoting the size of array.
+Next line will have a line containing ‘n’ space separated integers.
+Constraints:
+1<=n<=10^5
+1 <= Ai <= 10^6 
+Output:
+Two space separated integers denoting even and odd sums respectively.
+Sample Input:
+5
+2 3 5 1 4
+Sample Output:
+6 4
+*/
+#include<bits/stdc++.h>
+using namespace std;
+int main(){
+    int n;
+    cin >> n;
+    int arr[n];
+    for (int i = 0; i < n; i++)
+    {
+        cin >> arr[i];
+    }
+    
+    long long int os = 0, es = 0;
+
+    for (int i = 0; i < n; i++)
+    {
+        if (i % 2 == 0 and arr[i] % 2 == 0)
+        {
+            es += arr[i];
+        }
+        else if(i % 2 != 0 and arr[i] % 2 != 0)
+        {
+            os += arr[i];
+        }
+    }
+    cout << es << " " << os << "\n";
+    return 0;
+}