论：如何用神威太湖之光玩滑雪大冒险

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

string addStrings(string num1, string num2) {
    reverse(num1.begin(), num1.end());
    reverse(num2.begin(), num2.end());
    
    int carry = 0;
    string sum;
    
    int len = max(num1.length(), num2.length());
    for (int i = 0; i < len; i++) {
        int digit1 = i < num1.length() ? num1[i] - '0' : 0;
        int digit2 = i < num2.length() ? num2[i] - '0' : 0;
        
        int digitSum = digit1 + digit2 + carry;
        carry = digitSum / 10;
        sum += to_string(digitSum % 10);
    }
    
    if (carry > 0) {
        sum += to_string(carry);
    }
    
    reverse(sum.begin(), sum.end());
    return sum;
}

int main() {
    string a, b;
    cin >> a >> b;
    
    string result = addStrings(a, b);
    cout << result << endl;
    
    return 0;
}