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  1. // author : www.codechef.com/users/waqar_ahmad224
  2.  
  3. #include<bits/stdc++.h>
  4. using namespace std;
  5.  
  6. void init(int ar[])
  7. {
  8. 	for(int i=0;i<1000;i++)
  9. 	ar[i] = 0;
  10. }
  11. int main()
  12. {
  13. 	int carry,size,ar[1000],tmp;
  14. 	string st1,st2;
  15. 	char c;
  16.  
  17. 	while(1)
  18. 	{
  19. 		cin>>st1;
  20. 		if(feof(stdin)) break;
  21. 		cin>>st2;
  22.  
  23. 		if((st1.size()==1)&&(st1[0]=='0'))
  24. 		{
  25. 			cout<<0<<endl;
  26. 			continue;
  27. 		}
  28.  
  29. 		if((st2.size()==1)&&(st2[0]=='0'))
  30. 		{
  31. 			cout<<0<<endl;
  32. 			continue;
  33. 		}
  34.  
  35. 		for(int i=0;i<st1.size()/2;i++)
  36. 		{
  37. 			c = st1[i];
  38. 			st1[i] = st1[st1.size()-i-1];
  39.  
  40. 			st1[st1.size()-i-1] = c;
  41. 		}
  42.  
  43. 		for(int i=0;i<st2.size()/2;i++)
  44. 		{
  45. 			c = st2[i];
  46. 			st2[i] = st2[st2.size()-i-1];
  47.  
  48. 			st2[st2.size()-i-1] = c;
  49. 		}
  50.  
  51.  
  52. 		size=0;
  53. 		init(ar);
  54. 		for(int i=0;i<st1.size();i++)
  55. 		{
  56. 			carry = 0;
  57. 			for(int j=0;j<st2.size();j++)
  58. 			{
  59. 				tmp = ((st2[j]-'0')*(st1[i]-'0')) + carry+ar[i+j];
  60.  
  61. 				ar[i+j] = tmp%10;
  62. 				carry = tmp/10;
  63.  
  64. 				if((i+j)==size)
  65. 				size++;
  66. 			}
  67.  
  68. 			if(carry>0)
  69. 			ar[size++] = carry;
  70. 		}
  71.  
  72. 		for(int i=size-1;i>=0;i--)
  73. 		cout<<ar[i];
  74.  
  75. 		cout<<endl;
  76. 	}
  77.  
  78. 	return 0;
  79. }
  80.  
Success #stdin #stdout 0s 16064KB
comments (?)
stdin
copy 
9876543210987654321098765432109876543210
543210543210543210543210543210543210
stdout
copy 
5365042402683006386770447140823546855218922281281677577913517543141137104100
https://ideone.com/zijTNi
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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