震惊！全ACGO最“短”题解

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;

class BigInteger {
private:
vector<int> digits;

public:
BigInteger() {}

BigInteger(const string& s) {
    for(int i = s.length() - 1; i >= 0; i--) {
        digits.push_back(s[i] - '0');
    }
}

BigInteger(long long n) {
    if(n == 0) digits.push_back(0);
    while(n > 0) {
        digits.push_back(n % 10);
        n /= 10;
    }
}

BigInteger operator+(const BigInteger& other) const {
    BigInteger result;
    int carry = 0;
    int max_len = max(digits.size(), other.digits.size());
    
    for(int i = 0; i < max_len || carry; i++) {
        int sum = carry;
        if(i < digits.size()) sum += digits[i];
        if(i < other.digits.size()) sum += other.digits[i];
        
        result.digits.push_back(sum % 10);
        carry = sum / 10;
    }
    
    return result;
}

string toString() const {
    string s;
    for(int i = digits.size() - 1; i >= 0; i--) {
        s += char(digits[i] + '0');
    }
    return s;
}

};

int main() {
long long a, b;
cin >> a >> b;

// 使用大整数类（虽然没必要，但为了代码长度）
BigInteger big_a(a);
BigInteger big_b(b);
BigInteger result = big_a + big_b;

cout << result.toString();

return 0;

}