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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. string hieu(string s,  int k)
  5. {
  6.      string t = to_string(k);
  7.      int i = s.size() - 1, j = t.size() - 1, nho = 0;
  8.  
  9.      while(j >= 0 || nho)
  10.      {
  11.           int x = s[i] - '0' - nho;
  12.           int y = (j >= 0 ? t[j] - '0' : 0);
  13.  
  14.           if(x < y){
  15.                x += 10;
  16.                nho = 1;
  17.           }
  18.           else nho = 0;
  19.  
  20.           s[i] = char(x - y + '0');
  21.           i--;
  22.           j--;
  23.      }
  24.  
  25.      while(i >= 0)
  26.      {
  27.           int x = s[i] - '0' - nho;
  28.           if(x < 0){
  29.                s[i] = '9';
  30.                nho = 1;
  31.           }
  32.           else{
  33.                s[i] = char(x + '0');
  34.                nho = 0;
  35.           }
  36.           i--;
  37.      }
  38.  
  39.      int p = 0;
  40.      while(p + 1 < s.size() && s[p] == '0') p++;
  41.      return s.substr(p);
  42. }
  43.  
  44. bool check(string s, int k){
  45.      string t = to_string(k);
  46.      if(s.size() < t.size()) return true;
  47.      else if(s.size() == t.size()){
  48.           for(int i = 0; i < s.size(); i++){
  49.                if(t[i] > s[i]) return true;
  50.           }
  51.      }
  52.  
  53.      return false;
  54. }
  55. int main()
  56. {
  57.      ios_base::sync_with_stdio(0);
  58.      cout.tie(0);cin.tie(0);
  59.  
  60.      string s; cin >> s;
  61.      for(int k = 9 * 100; k >= 1; k--){
  62.           if(check(s, k)) continue;
  63.           string m = hieu(s, k);
  64.  
  65.           int sum = 0;
  66.           for(int i = 0; i < m.size(); i++) sum += m[i] - '0';
  67.  
  68.           if(sum == k){
  69.                cout << m;
  70.                return 0;
  71.           }
  72.      }
  73.      cout << 0;
  74.  
  75.  
  76. }
  77.  
  78.  
  79.  
  80.  
  81.  
  82.  
  83.  
  84.  
  85.  
  86.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/YddMnz
language:
C++14 (clang 8.0)
created:
7 hours ago
visibility:
public

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