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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define fi first
  4. #define se second
  5. #define ll long long
  6. #define ull unsigned long long
  7. #define pll pair<ll,ll>
  8. #define pb push_back
  9. #define emb emplace_back
  10. #define lg(x) __lg(x)
  11. #define all(s) s.begin(),s.end()
  12. #define name "test"
  13. #define Mask(i) (1LL<<i)
  14. #define testbit(mask, i) ((mask >> i) & 1LL)
  15. #define onBit(mask, i) (mask | (1LL << i))
  16. #define offBit(mask, i) (mask & ~(1LL << i))
  17. #define flipBit(mask, i) (mask ^ (1LL << i))
  18. #define showbit(mask, x) bitset<x>(mask)
  19. const ll mod = 1e9 + 7;
  20.  
  21. void add(ll &a, ll b){
  22.      if((a += b) >= mod) a -= mod;
  23. }
  24.  
  25.  
  26. const ll inf = 1e18;
  27. const ll lim = 1e7 + 5;
  28. const ll N = 2e5 + 5;
  29.  
  30. int main()
  31. {
  32.      ios_base::sync_with_stdio(0);
  33.      cout.tie(0);cin.tie(0);
  34.      if(fopen(name".inp","r")){
  35.           freopen(name".inp","r",stdin);
  36.           freopen(name".out","w",stdout);
  37.      }
  38.  
  39.      ll n; cin >> n;
  40.      for(int i = 9 * 12; i >= 1; i--){
  41.           ll m = n - i;
  42.           if(m <= 0) continue;
  43.  
  44.           int sum = 0;
  45.           while(m){
  46.                sum += m % 10;
  47.                m /= 10;
  48.           }
  49.  
  50.           if(sum == i){
  51.                cout << n - i;
  52.                return 0;
  53.           }
  54.      }
  55.      cout << 0;
  56.  
  57.  
  58. }
  59.  
  60.  
  61.  
  62.  
  63.  
  64.  
  65.  
  66.  
  67.  
  68.  
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/UcDQuw
language:
C++14 (clang 8.0)
created:
7 hours ago
visibility:
public

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