[백준 1072] 게임(JAVA)

https://www.acmicpc.net/problem/1072

1072번: 게임

 

import java.util.Scanner;

public class Main_bj_1072_게임 {

	static long X, Y, Z;//게임횟수, 이긴게임, 승률
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		X=sc.nextLong();
		Y=sc.nextLong();
		Z=100*Y/X;
		if(Z>=99) {
			System.out.println(-1);
		}else {
			long low=0;
			long mid=0;
			long high=1000000000;
			while(low<=high) {
				mid=(low+high)/2;
				if(Z<100*(Y+mid)/(X+mid)){
					high=mid-1;
				}else {
					low=mid+1;
				}
			}
			System.out.println(low);
		}
	}

}