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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. //pos[i]=rank of a number starting at ith position
  4. //sa[i]=i'th rank string starting at sa[i]
  5. int gap;
  6. int pos[10000];
  7. int n;
  8. bool suf(int i,int j)
  9. {
  10.     if(pos[i]!=pos[j])
  11.         return pos[i]<pos[j];
  12.     else
  13.     {
  14.         i=i+gap;
  15.         j=j+gap;
  16.         if(i<n&&j<n)
  17.         {
  18.             return pos[i]<pos[j];
  19.         }
  20.         else
  21.         {
  22.             return i>j;//the later it will start shorter it will be
  23.         }
  24.     }
  25. }
  26. int main()
  27. {
  28. int i,t;
  29. cin>>t;
  30. while(t--)
  31. {
  32. int temp[10009];
  33. int sa[10009];
  34. char a[10009];
  35.     //cin>>n;
  36. //    for(i=0;i<n;i++)
  37.         cin>>a;
  38.         n=strlen(a);
  39.     for(i=0;i<n;i++)
  40.     {
  41.         pos[i]=a[i];
  42.         sa[i]=i;
  43.     }
  44.     for(gap=1;gap<=n;gap=gap*2)
  45.     {
  46.         sort(sa,sa+n,suf);
  47.         for(i=0;i<n-1;i++)
  48.         {
  49.             temp[i+1]=temp[i]+suf(sa[i],sa[i+1]);//checking if strict ordering is possible or not
  50.         }
  51.         for(i=0;i<n;i++)
  52.         {
  53.             pos[sa[i]]=temp[i];//giving positions to numbers starting at position sa[]
  54.         }
  55.         if(temp[n-1]==n-1)//if strict ordering followed then break
  56.             break;
  57.  
  58.     }
  59.     int k,lcp[10009];
  60.     for(i=0;i<n;i++)
  61.     {
  62.     	for(i=0,k=0;i<n;i++)
  63.     	{
  64.     		if(pos[i]==n-1)
  65.     			continue;
  66.     		for(int j=sa[pos[i]+1];a[i+k]==a[j+k];)//lcp of i and i+1th elem is lcp[i]
  67.     		k++;
  68.     		lcp[pos[i]]=k;
  69.     		if(k)
  70.     			--k;
  71.     	}
  72.     }
  73.     int ans=0;
  74.     for(i=0;i<n;i++)
  75.     {
  76.         ans=ans+(n-sa[i])-lcp[i];
  77.         //printf("lcp[i]=%d n-sa[i]-1=%d sa[i]=%d\n",lcp[i],n-sa[i]-1,sa[i]);
  78.     }
  79.     cout<<ans<<endl;
  80. }
  81. return 0;
  82. }
  83.  
  84.  
  85.  
Time limit exceeded #stdin #stdout 5s 2776KB
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https://ideone.com/fchHsK
language:
C++ 4.3.2 (gcc-4.3.2)
created:
10 years ago
visibility:
public

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