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  1. /*
  2. *DIV 2 C.
  3. *LINK:
  4. *nilabja10201992
  5. */
  6. #include <bits/stdc++.h>
  7. using namespace std;
  8. void solve(string str){
  9. 	int n = str.length();
  10. 	string str1;
  11. 	int carry=0;
  12. 	for(int i=n-1;i>=0;i--){
  13. 		int a=(str[i]-'0')*2+carry;
  14. 		str1+=(char)(a%10+'0');
  15. 		carry=a/10;
  16. 		//cout<<carry<<" "<<a<<endl;
  17. 	}
  18. 	if(carry>0)
  19. 		str1+=(char)(carry+'0');
  20. 	//cout<<str1<<endl;
  21. 	carry=2;
  22. 	for(int i=0;i<str1.size();i++){
  23. 		int a=str1[i] - '0';
  24. 		if(a>1){
  25. 			str1[i]=(str1[i]- '0' - carry + 10)%10 + '0';
  26. 			break;
  27. 		//	cout<<str1[i]<<endl;
  28. 		}
  29. 		else{
  30. 			str1[i]=(str1[i]- '0' - carry + 10)%10 + '0';
  31. 			carry=1;
  32. 		}
  33. 	}
  34. 	reverse(str1.begin(),str1.end());
  35. 	bool fl=0;
  36. 	for(int i=0;i<str1.size();i++){
  37. 		if(str1[i]=='0' && fl==0)
  38. 			continue;
  39. 		cout<<str1[i];
  40. 		fl=1;
  41. 	}
  42. 	cout<<endl;
  43. }
  44. int main() {
  45.       ios_base::sync_with_stdio(false);
  46.       cin.tie(NULL);
  47. 	string str;
  48. 	while(cin>>str){
  49. 	if(str=="1" || str=="0")
  50. 		cout<<str<<endl;
  51. 	else
  52. 		solve(str);
  53. 	}
  54. 	//cout<<"Execution time : "<<tick();
  55.       return 0;
  56. }
  57.  
Success #stdin #stdout 0s 16064KB
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https://ideone.com/FmwCvM
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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