高精度加法

import java.io.*;
import java.math.BigInteger;
class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader cin = new BufferedReader(new InputStreamReader(System.in));
        String[] s = cin.readLine().split(" ");
        BigInteger n = new BigInteger(s[0]);
        s = cin.readLine().split(" ");
        BigInteger m = new BigInteger(s[0]);
        System.out.println(m.add(n));
    }
}

高精度减法

import java.io.*;
import java.math.BigInteger;
class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader cin = new BufferedReader(new InputStreamReader(System.in));
        String[] s = cin.readLine().split(" ");
        BigInteger n = new BigInteger(s[0]);
        s = cin.readLine().split(" ");
        BigInteger m = new BigInteger(s[0]);
        System.out.println(n.subtract(m));
    }
}

高精度乘法

import java.io.*;
import java.math.BigInteger;
class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader cin = new BufferedReader(new InputStreamReader(System.in));
        String[] s = cin.readLine().split(" ");
        BigInteger n = new BigInteger(s[0]);
        s = cin.readLine().split(" ");
        BigInteger m = new BigInteger(s[0]);
        System.out.println(n.multiply(m));
    }
}

高精度除法

import java.io.*;
import java.math.BigInteger;
class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader cin = new BufferedReader(new InputStreamReader(System.in));
        String[] s = cin.readLine().split(" ");
        BigInteger n = new BigInteger(s[0]);
        s = cin.readLine().split(" ");
        BigInteger m = new BigInteger(s[0]);
        System.out.println(n.divide(m));
        System.out.println(n.remainder(m));
    }
}