When using nginx, how do you deal with the corresponding problem between the virtual host and the second-level domain name? For example, there are two second-level domain names, corresponding to two folders:

域名         文件夹
111.aa.com   /var/www/111.aa.com
222.aa.com   /var/www/222.aa.com

Then, in the configuration file, there are two corresponding server,
#111.aa.com

#111.aa.com
server {
    listen       80;
    server_name  111.aa.com;

    charset utf-8;
    #access_log  /var/log/nginx/log/host.access.log  main;

    location / {
        root   /var/www/111.aa.com;
        index  index.php index.html index.htm;
    }

    #error_page  404              /404.html;

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    #
    #location ~ \.php$ {
    #    proxy_pass   http://127.0.0.1;
    #}


    location ~ \.php$ {
        root           /var/www/111.aa.com;
        fastcgi_pass   unix:/dev/shm/php-fpm.sock;
        try_files $uri /index.php =404;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        fastcgi_param  QUERY_STRING     $query_string;
        include        fastcgi_params;
    }

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #    deny  all;
    #}
}

#222.aa.com

#222.aa.com
server {
    listen       80;
    server_name  222.aa.com;

    charset utf-8;
    #access_log  /var/log/nginx/log/host.access.log  main;

    location / {
        root   /var/www/222.aa.com;
        index  index.php index.html index.htm;
    }

    #error_page  404              /404.html;

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    #
    #location ~ \.php$ {
    #    proxy_pass   http://127.0.0.1;
    #}


    location ~ \.php$ {
        root           /var/www/222.aa.com;
        fastcgi_pass   unix:/dev/shm/php-fpm.sock;
        try_files $uri /index.php =404;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        fastcgi_param  QUERY_STRING     $query_string;
        include        fastcgi_params;
    }

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #    deny  all;
    #}
}

Question:
1. If there are 100 second-level domain names, 100 server must be written. Can it be written in 1 server? Can you give me an example?
2. Write 100 server and 1 server, which method is better?