注意开浮点数

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import java.util.Scanner;public class Main {static Scanner sc=new Scanner(System.in);public static void main(String[] args) {double t=0;int cnt=0;double distance=1000;while(distance>=1){//相撞时间t=distance/60.0;distance-=t*20;cnt++;}System.out.println(cnt/2);}
}