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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.     int ok = 0;
  17.     string s = "";
  18.     if(a.size() < b.size())
  19.     {
  20.         swap(a,b);
  21.         ok = 1;
  22.     }
  23.     if(a.size() == b.size() && a < b)
  24.     {
  25.         swap(a,b);
  26.         ok = 1;
  27.     }
  28.     string tmp = "";
  29.     for(int i = 0; i < a.size() - b.size(); i++)
  30.     {
  31.         tmp += '0';
  32.     }
  33.     b= tmp + b;
  34.     int du = 0;
  35.     for(int i = a.size() - 1; i >= 0; i--)
  36.     {
  37.         int x = a[i] - '0';
  38.         int y = b[i] - '0' + du;
  39.         if(x < y)
  40.         {
  41.             x += 10;
  42.             du = 1;
  43.         }
  44.         else
  45.         {
  46.             du = 0;
  47.         }
  48.         s += to_string(x  - y);
  49.     }
  50.     if(s.size() > 1 && s.back() == '0') s.pop_back();
  51.     if(ok == 1) cout << "-";
  52.     reverse(s.begin(), s.end());
  53.     cout << s;
  54.     return 0;
  55. }
  56.  
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
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10
999999
stdout
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-999989
https://ideone.com/bmqAnu
language:
C++14 (gcc 8.3)
created:
9 days ago
visibility:
public

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