1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
// Jan Zachar 03/12/22
//
#include <iostream>
#include <string>

using namespace std;

string a, b;
string c;

bool zero = true;

void reverse_string(string &in) {
    for (int i = 0; i < in.length()/2; i++) {
        swap(in[i], in[in.length()-i-1]);
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cout.tie(nullptr);
    cin.tie(nullptr);

    cin >> a >> b;

    reverse_string(a);
    reverse_string(b);

    c.resize(max(a.length(), b.length())+1, '0');
    a.resize(c.length(), '0');
    b.resize(c.length(), '0');

    for (int i = 0; i < c.length(); i++) {
        c[i] += a[i]+b[i]-(48*2);
        if (c[i] >= 58) {
            c[i] -= 10;
            c[i+1] += 1;
        }
    }

    reverse_string(c);

    for (int i = 0; i < c.length(); i++) {
        if (c[i] == '0' && zero) continue;
        zero = false;
        cout << c[i];
    }
    cout << endl;

    return 0;
}