目錄

1.  入門訓練 A+B問題  

 Problem:

Hint:複製貼上就行了 

2.入門訓練 序列求和 

Problem:

Hint:用公式n*(n+1)/2就行 

3.入門訓練 圓的面積

Problem:

Hint:PI*r² 

4.入門訓練 Fibonacci數列

Problem:

Hint:直接Fn=(Fn-1+Fn-2)%10007

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1.  入門訓練 A+B問題  

     Problem:

 

Hint:複製貼上就行了 

import java.util.*;
 
public class Main
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        Integer a = sc.nextInt();
        Integer b = sc.nextInt();
        System.out.println(a + b);
    }
}

 

2.入門訓練 序列求和 

Problem:

Hint:用公式n*(n+1)/2就行 

import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		long n = in.nextInt();
		System.out.println((1+n)*n/2);
	}
}

 

3.入門訓練 圓的面積

Problem:

Hint:PI*r² 

import java.text.DecimalFormat;
import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		DecimalFormat format = new DecimalFormat("0.0000000");
		int r = in.nextInt();
		System.out.println(format.format(Math.PI*r*r));
	}
}

 

4.入門訓練 Fibonacci數列

Problem:

Hint:直接Fn=(Fn-1+Fn-2)%10007

import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int[] nums = new int[1000000];
		nums[0] = 1;
		nums[1] = 1;
		for (int i = 2; i < nums.length; i++) {
			nums[i] = (nums[i-1]+nums[i-2])%10007;
		}
		int n = in.nextInt();
		System.out.println(nums[n-1]);
	}
}