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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define str string
  5. #define pb push_back
  6. #define fi first
  7. #define se second
  8.  
  9. const ll limit = 1e5 + 5;
  10. const ll mod = 1e9 + 7;
  11.  
  12. str sum(str a, str b){
  13.     while(a.length() < b.length()) a = '0' + a;
  14.     while(a.length() > b.length()) b = '0' + b;
  15.  
  16.     str ans = "";
  17.     int cur = 0, tmp = 0;
  18.     for(int i = a.length() - 1; i >= 0; i--){
  19.         tmp = a[i] - '0' + b[i] - '0' + cur;
  20.         if(tmp >= 10){
  21.             tmp -= 10;
  22.             cur = 1;
  23.         }
  24.         ans = ans + char(tmp + '0');
  25.     }
  26.     if(cur > 0) ans = '1' + ans;
  27.     return ans;
  28. }
  29.  
  30. int main() {
  31.     ios_base::sync_with_stdio(0);
  32.     cin.tie(0); cout.tie(0);
  33.  
  34.     str a, b, c;
  35.     cin >> a >> b >> c;
  36.     cout << sum(sum(a, b), c);
  37.  
  38.     return 0;
  39. }
Success #stdin #stdout 0s 5324KB
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https://ideone.com/kRPaJi
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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