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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. string beNhat(int sum , int n){
  4.     string res = string(n,'0');
  5.     for(int i = n- 1 ; i >= 0 ; i--){
  6.         if(sum > 9 ){
  7.             res[i] = '9';
  8.             sum -= 9;
  9.         }
  10.         else{
  11.             if(i!=0){
  12.                 res[0] = '1';
  13.                 res[i] += (sum - 1);
  14.                 return res;
  15.             }
  16.             else{
  17.                 res[i] += sum;
  18.                 return res;
  19.             }
  20.         }
  21.     }
  22.     return 0;
  23. }
  24.  
  25. int main(){
  26.     int s, d;
  27.     cin >> s >> d;
  28.     if(d*9 < s || s == 0 && d > 1){
  29.         cout << "-1";
  30.     }
  31.     else cout << beNhat(s,d);
  32. }
  33.  
Success #stdin #stdout 0.01s 5288KB
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12 8
stdout
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10000029
https://ideone.com/enTSdL
[Tham Lam]. Bài 15. Số nhỏ nhất
language:
C++ (gcc 8.3)
created:
34 days ago
visibility:
public

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