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  1. #include<cstdio>
  2. #include<iostream>
  3. #include<algorithm>
  4. #include<cmath>
  5. #include<cstdlib>
  6. #include<queue>
  7. #include<map>
  8. #include<set>
  9. #include<string>
  10. #include<sstream>
  11. #include<climits>
  12. #include<vector>
  13. #include<cstring>
  14. #include<stack>
  15.  
  16. using namespace std;
  17.  
  18. #define REP(i,s,n)  for (int i=(s),_n=(n);i<=_n;i++)
  19. #define FOR(i,s,n)  for (int i=(s),_n=(n);i<_n;i++)
  20. #define REPD(i,e,s)  for (int i=(e),_s=(s);i>=_s;i--)
  21. #define tr(container, it) \
  22. 		        for (typeof(container.begin()) it=container.begin(); it!=container.end();it++)
  23. #define PB push_back
  24.  
  25. typedef long long LL;
  26. typedef vector<int> VI;
  27. typedef pair<int,int> PI;
  28.  
  29. long long int ans=0;
  30.  
  31. int main() {
  32. 	long long int a,b;
  33. 	cin >>a >> b;
  34. 	ans=a;
  35. 	long long int cpy=a,t=0;
  36. 	while(b>0)
  37. 	{
  38. 		if( a%10 ==9)
  39. 		{
  40. 			a/=10;
  41. 			b/=10;
  42. 		}
  43. 		else
  44. 		{
  45. 			if(a%10+1 <=b)
  46. 			{
  47.  
  48. 				cpy-=(a%10+1)* (long long int) (pow((long long int)10,t));
  49. 				b-=a%10+1;
  50. 				a-=a%10+1;
  51. 				a/=10;
  52. 				b/=10;
  53. 			}
  54. 			else
  55. 				break;
  56. 		}
  57. 		t+=1;
  58. 	}
  59. 	cout<<cpy<<endl;
  60. 	return 0;
  61. }
  62.  
Success #stdin #stdout 0.01s 2728KB
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https://ideone.com/8JSXv
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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