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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void init(int ar[])
  5. {
  6. 	for(int i=0;i<1000;i++)
  7. 	ar[i] = 0;
  8. }
  9. int main()
  10. {
  11. 	int carry,size,ar[1000],tmp;
  12. 	string st1,st2;
  13. 	char c;
  14.  
  15. 	while(!feof(stdin))
  16. 	{
  17. 		cin>>st1>>st2;
  18. 		if((st1.size()==1)&&(st1[0]=='0'))
  19. 		{
  20. 			cout<<0<<endl;
  21. 			continue;
  22. 		}
  23.  
  24. 		if((st2.size()==1)&&(st2[0]=='0'))
  25. 		{
  26. 			cout<<0<<endl;
  27. 			continue;
  28. 		}
  29.  
  30. 		for(int i=0;i<st1.size()/2;i++)
  31. 		{
  32. 			c = st1[i];
  33. 			st1[i] = st1[st1.size()-i-1];
  34.  
  35. 			st1[st1.size()-i-1] = c;
  36. 		}
  37.  
  38. 		for(int i=0;i<st2.size()/2;i++)
  39. 		{
  40. 			c = st2[i];
  41. 			st2[i] = st2[st2.size()-i-1];
  42.  
  43. 			st2[st2.size()-i-1] = c;
  44. 		}
  45.  
  46.  
  47. 		size=0;
  48. 		init(ar);
  49. 		for(int i=0;i<st1.size();i++)
  50. 		{
  51. 			carry = 0;
  52. 			for(int j=0;j<st2.size();j++)
  53. 			{
  54. 				tmp = ((st2[j]-'0')*(st1[i]-'0')) + carry+ar[i+j];
  55.  
  56. 				ar[i+j] = tmp%10;
  57. 				carry = tmp/10;
  58.  
  59. 				if((i+j)==size)
  60. 				size++;
  61. 			}
  62.  
  63. 			if(carry>0)
  64. 			ar[size++] = carry;
  65. 		}
  66.  
  67. 		for(int i=size-1;i>=0;i--)
  68. 		cout<<ar[i];
  69.  
  70. 		cout<<endl;
  71. 	}
  72.  
  73. 	return 0;
  74. }
  75.  
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
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9876543210987654321098765432109876543210
543210543210543210543210543210543210
stdout
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5365042402683006386770447140823546855218922281281677577913517543141137104100
001524075584432991839027579768183342255878386818029410623374882634279060205
https://ideone.com/FGTlsi
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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