编程题

快到碗里来

import java.math.BigDecimal;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            BigDecimal n = sc.nextBigDecimal();
            BigDecimal r = sc.nextBigDecimal();
            BigDecimal len = new BigDecimal("6.28").multiply(r);
            System.out.println(n.compareTo(len) == 1 ? "No" : "Yes");
        }
    }
}

跳台阶问题

public class Solution {
    public int jumpFloorII(int target) {
        //整数x*2^n = x<<n;
        //2^(target-1)=1*2^(target-1)
        return 1<<--target;
    }
}