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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define el "\n"
  4. #define ll long long
  5. #define ull unsigned long long
  6. #define se second
  7. #define fi first
  8. #define be begin()
  9. #define en end()
  10. #define Faster cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
  11.  
  12. int main()
  13. {
  14.     Faster;
  15.     string a, b; cin >> a >> b;
  16.     string s = "";
  17.     int du = 0;
  18.     if(a.size() == b.size())
  19.     {
  20.         for(int i = b.size() - 1; i >= 0; i--)
  21.         {
  22.             int x = a[i] - '0';
  23.             int y = b[i] - '0';
  24.             s += to_string((x + y + du) % 10);
  25.             du = (x + y + du) / 10;
  26.         }
  27.     }
  28.     else
  29.     {
  30.         string tmp = "";
  31.         for(int i = 0; i < a.size() - b.size(); i++)
  32.         {
  33.             tmp += '0';
  34.         }
  35.         if(a.size() < b.size()) a = tmp + a;
  36.         else b = tmp + b;
  37.         for(int i = b.size() - 1; i >= 0; i--)
  38.         {
  39.             int x = a[i] - '0';
  40.             int y = b[i] - '0';
  41.             s += to_string((x + y + du) % 10);
  42.             du = (x + y + du) / 10;
  43.         }
  44.     }
  45.     if(du != 0) s += to_string(du);
  46.     reverse(s.begin(), s.end());
  47.     cout << s;
  48.     return 0;
  49. }
  50.  
Success #stdin #stdout 0.01s 5276KB
comments (?)
stdin
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9999999999999
22
stdout
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10000000000021
https://ideone.com/muqAxZ
language:
C++14 (gcc 8.3)
created:
9 days ago
visibility:
public

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