Pick from both sides!

 https://www.interviewbit.com/old/problems/pick-from-both-sides/

int Solution::solve(vector<int> &a, int b) {
int sum1=0,sum2=0;
    int n=a.size();
    for(int i=0;i<b;i++)
    {
        sum1+=a[i];
    }
    
    int ans=sum1;
    
    for(int i=b-1;i>=0;i--)
    {
        sum1=sum1-a[i];
        sum2=sum2+a[n-(b-i)];
        ans=max(ans,sum1+sum2);
    }
    
    return ans;
}

 

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