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  1. #include<iostream>
  2. #include<stack>
  3. #include<string.h>
  4. using namespace std;
  5. void multiply(string str,int l){
  6. 	long long c=0,k=0,i,a;
  7. 	string str3;
  8. 	for(i=l-1;i>=0;i--){
  9. 		a=str[i]-'0';
  10. 		str3[k++]=((c+(a*2))%10)+'0';
  11. 		c=(c+(a*2))	/10;
  12. 		}
  13. 		if(c){
  14. 		str3[k]=c+'0';
  15. 		k=k+1;
  16. 		}
  17. 		i=0;
  18. 		if((str3[i]-'0')>=2)
  19. 		str3[i]=str3[i]-2;
  20. 		else{
  21. 			str3[i]=str3[i]+8;
  22. 			i++;
  23. 			while(str3[i]=='0')
  24. 			{
  25. 				str3[i]='9';
  26. 				i++;
  27. 			}
  28. 			str3[i]=str3[i]-1;
  29. 		}
  30. 		i=k-1;
  31. 		while (str3[i]=='0') i--;
  32. 		for(;i>=0;i--)
  33. 		cout<<str3[i];
  34. 		cout<<"\n";
  35. }
  36. int main(){
  37. 	string n;
  38. 	while(cin>>n){
  39. 		if(n=="1")
  40. 		cout<<"1\n";
  41. 		else
  42. 		multiply(n,n.length());
  43. }
  44.  
  45.  
  46.  
  47.  
  48. 	return 0;
  49. }
  50.  
Success #stdin #stdout 0s 3436KB
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https://ideone.com/ZPAa0k
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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