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  1. #include <iostream>
  2. #include <cstring>
  3. #include <cstdio>
  4. #include <string>
  5. using namespace std;
  6.  
  7. #define SZ (1e6 + 5)
  8. char str[(int)(1e6 + 5)];
  9.  
  10. int main()
  11. {
  12. 	int n,i,len,m,curlen=0,maxlen=-1,charc=0,j,startpos=0;
  13. //charc - no of unique char 
  14. //maxlen - ans
  15. //curlen - cur string len
  16. //startpos - of current string
  17. 	cin>>m;
  18. while(m){
  19. scanf(" %[^\n]s",str);
  20.  
  21. charc =0;curlen =0 ; maxlen = -1; startpos = 0;
  22. 	len = strlen(str);
  23.  
  24. 	int hash[300];
  25. 	for(i=0;i<300;i++)
  26. 		hash[i] = -1;
  27.  
  28. 	for(i=0;i<len;i++)
  29. 	{
  30. 		if(charc<m || hash[str[i]- 0]!=-1)
  31. 		{
  32. 			curlen++;
  33. 			if(hash[str[i]-0]==-1)
  34. 				charc++;
  35.  
  36. 			hash[str[i]-0] = i;
  37. //cout<<str[i]<<"  "<<hash[str[i] - 0]<<charc<<" "<<curlen<<endl;
  38. 		}
  39. 		else
  40. 		{
  41. 			maxlen = maxlen < curlen ? curlen : maxlen ;
  42.  
  43. 			while(hash[str[startpos] -0]!=startpos)
  44. 			{
  45. 				curlen--;
  46. 				startpos++;
  47. 			}
  48. 			hash[str[startpos] - 0] =-1;
  49. 			curlen--;
  50. 			charc--;
  51. 			startpos++;
  52. 		}
  53. 	}
  54. maxlen = maxlen < curlen ? curlen : maxlen ;
  55. 	cout<<maxlen<<endl;
  56.  
  57. cin>>m;
  58. }
  59. 	return 0;
  60. }
  61.  
  62.  
  63.  
  64.  
  65.  
  66.  
  67.  
Runtime error #stdin #stdout 0.15s 4320KB
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https://ideone.com/EiweVp
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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