The Great Kian

Problem
https://www.hackerearth.com/practice/basic-programming/implementation/basics-of-implementation/practice-problems/algorithm/the-great-kian/

Solution

	#include <iostream>
	#include <cstdlib>
	#include <string>
	#include <math.h>
	using namespace std;
	int main(int argc, char** argv) {
	long long int n;
	cin>>n;
	long long int a[n];
	long long int s1=0;
	long long int s2=0;
	long long int s3=0;
	for(int i=0;i<n;i++)
	{
	cin>>a[i];
	}
	for(int j=0;j<n;j+=3)
	{
	s1+=a[j];
	}
	cout<<s1<<" ";
	for(int j=1;j<n;j+=3)
	{
	s2+=a[j];
	}
	cout<<s2<<" ";
	for(int j=2;j<n;j+=3)
	{
	s3+=a[j];
	}
	cout<<s3;
	return 0;
	}

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