nums = [1,3,-1,-3,5,3,6,7], k = 3

将上述输入转换为c++的输入

vector<int> split(const string& str, char sep)
{
    vector<int> tokens;

    int i;
    stringstream ss(str);
    while (ss >> i) {
        tokens.push_back(i);
        if (ss.peek() == sep) {
            ss.ignore();
        }
    }

    return tokens;
}
int main() {
	//读取含有空格的一行字符串
    string  s;
    getline(cin, s);

	//读取nums
    int start = -1, end = -1;
    for (int i = 0; i < s.size(); ++i) {
        if (s[i] == '[')
            start = i;
        if (s[i] == ']')
            end = i;
    }
    string temp=s.substr(start+1,end-start-1);
    vector<int> nums = split(temp, ',');
	
	//读取k
    for (int i = s.size() - 1; i >= 0; --i)
        if (s[i] == '=') {
            end = i; break;
        }
    temp = s.substr(end + 1, end - s.size() );
    stringstream ss(temp);
    int k;
    ss >> k;

    return 0;
}

java大整数模板

import java.util.*;
import java.math.BigInteger;
public class Main{
    public static void  main(String args[]){
        Scanner cin=new Scanner(System.in);
            BigInteger a,b;
            a=cin.nextBigInteger();
            b=cin.nextBigInteger();
        	System.out.println(a.add(b));//加法
        	System.out.println(a.subtract(b));//减法
        	System.out.println(a.multiply(b));//乘法
        	System.out.println(a.divide(b));//除法
    }
}

public String cal (String minuend, String subtrahend) {
		// String  minuend="12345",subtrahend="54321";
        BigInteger b1 = new BigInteger(minuend);
        BigInteger b2 = new BigInteger(subtrahend);

        return b1.subtract(b2).toString();
}