NYOJ 45 棋盘覆盖

棋盘覆盖

水题，题不难，找公式难

import java.math.BigInteger; 
import java.util.Scanner; 
public class Main { 
    public static void main(String[] args) { 
        Scanner input=new Scanner(System.in); 
        int n=input.nextInt(); 
        while(n-->0){ 
            int k =input.nextInt();  
            System.out.println(BigInteger.valueOf(4).pow(k).subtract(BigInteger.ONE).divide(BigInteger.valueOf(3))); 
        } 
    } 
} 

import java.math.BigInteger;
import java.util.Scanner;
public class Main {
 public static void main(String[] args) {
  Scanner input=new Scanner(System.in);
  int n=input.nextInt();
  while(n-->0){
   int k =input.nextInt(); 
   System.out.println(BigInteger.valueOf(4).pow(k).subtract(BigInteger.ONE).divide(BigInteger.valueOf(3)));
  }
 }
}