find difference of sum of elements at even indices (E) and sum of elements at odd indices(O). c++

 Find the Difference

Given an array/list A with N elements, you need to find difference of sum of elements at even indices (E) and sum of elements at odd indices(O).

Note : Array/List indexes start from 0.

Input Format :

  Line 1 : Size of the array/list i.e N
  Line 2 : N integers i.e. elements of the array/list separated by space

Output Format :

 Difference i.e. E - O.  

Input Constraints :

1<=N<=10^6

1 <= Ai <= 10^4

Sample Input :

5
1 2 3 4 5

Sample Output :

3

Sample Output Explanation :

Sum of elements at even indices = 1 + 3 + 5 = 9

Sum of elements at odd indices = 2 + 4 = 6

So output is (9 - 6) i.e. 3.

c++ code:

#include <iostream>

using namespace std;

int main(){

     int A[1000000];

  

  int n;

  cin>>n;

  for(int i=0;i<n;i++)

  {

    cin>> A[i];

  

  }

  int even=0;

  for(int i=0;i<=n;i+=2)

  {

    even+=A[i];

  }

  int odd=0;

  for(int i=1;i<=n;i+=2)

  {

    odd+=A[i];

  }

  

  cout<< even-odd;

}

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Milan Tomic

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