[백준] 1001번 : A-B - Dart(다트)

https://www.acmicpc.net/problem/1001

import 'dart:io';
void main(){
    String? s=stdin.readLineSync();
    final v=s!.split(' ').map<int> ((o)=>int.parse(o));
    var a=v.elementAt(0);
    var b=v.elementAt(1);
    print(a-b);
}