题解 | 平方根

import java.util.*;
public class Main{
    public static void main(String[] args){
        double a;
        Scanner i = new Scanner(System.in);
        a = i.nextDouble();
        if(Math.pow(a,0.5)-(int)Math.pow(a,0.5)>=0){
            System.out.printf("%d",(int)Math.pow(a,0.5));
        }else{
            System.out.printf("%.0f",Math.pow(a,0.5));
        }

    }
}