Need tutorials for aws documentDB to use under free tier

Hey I need someone who have used ROS using python to implement drone controlling

Please give me code snippet to create windows ec2 instance using boto3 within aws free tier limit.

import boto3

# Create an AWS session and EC2 client
aws_management_console = boto3.session.Session(profile_name='....')
ec2_console = aws_management_console.client(service_name='ec2')

def create_ec2_instance():
try:
print("Creating EC2 instance")
ec2_console.run_instances(
ImageId="....",
MinCount=1,
MaxCount=1,
InstanceType="t3.micro",
KeyName="...",

SecurityGroupIds=['...1'] # Specify your security group ID(s) as a list
)
except Exception as e:
print(e)

# Call the function to create the EC2 instance
create_ec2_instance()
Have i missed anything in this code?
It's running fine not creating any instance.

AWS free tier. Need someone who can help me with my project ?
Just basic doubts...

I need someone who is familiar with pyvbox api library and virtual machine (virtual box) >?

Is there anyone who have used Virtual Box - virtual machine and also want to help me with my project ? :)

#include <iostream>
using namespace std;

int main() {
int t;
cin>>t;
while(t--){
int n;
cin>>n;
int arr[n];
int count=0;
for(int i=0;i<n;i++){
cin>>arr[i];
count^=arr[i];
}
cout<<count<<endl;
}
return 0;
}

In the above program,
how does this code snippet work?
count^=arr[i];

This is my first one :)

I am currently persuing B.Tech in CSE, and yes I am thinking that I can crack Google.

Jokes apart let me cout<<"Hello World"<<endl; first.