sub balancedSums {
    my $arr = shift;
    
    my $total_sum = sum(@$arr);
    my $left_sum = 0;
    foreach my $num (@$arr) {
        my $right_sum = $total_sum - $left_sum - $num;
        return "YES" if $left_sum == $right_sum;
        $left_sum += $num;
    }
    return "NO";  
}