题解

#include <bits/stdc++.h>
using namespace std;

int main() {
    string num1, num2;
    cin >> num1 >> num2;

    string result;
    int carry = 0;

    int i = num1.length() - 1;
    int j = num2.length() - 1;

    while (i >= 0 || j >= 0 || carry > 0) {
        int digit1 = (i >= 0) ? (num1[i] - '0') : 0;
        int digit2 = (j >= 0) ? (num2[j] - '0') : 0;

        int current_sum = digit1 + digit2 + carry;
        carry = current_sum / 10;

        result += to_string(current_sum % 10);

        if (i >= 0) i--;
        if (j >= 0) j--;
    }

    reverse(result.begin(), result.end());

    cout << result << endl;

    return 0;
}