[백준] 2163번 : 초콜릿 자르기 - Dart(다트)

https://www.acmicpc.net/problem/2163

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