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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. #define link sdkfsdkfls
  6. const int maxn = 1e5 + 42, sigma = 4, logn = 16;
  7.  
  8. int len[maxn], link[maxn][logn], to[maxn][sigma];
  9. int minr[maxn];
  10. char s[maxn];
  11. int sz, n, last;
  12.  
  13. void init(int k)
  14. {
  15.     for(int i = 0; i <= k; i++)
  16.         memset(to[i], 0, sizeof(to[i]));
  17.     link[0][0] = -1;
  18.     last = n = 0;
  19.     sz = 1;
  20.     s[n++] = sigma;
  21. }
  22.  
  23. int get_link(int v)
  24. {
  25.     while(v != -1 && s[n - len[v] - 2] != s[n - 1]) v = link[v][0];
  26.     return v;
  27. }
  28.  
  29. void add_letter(char c)
  30. {
  31.     s[n++] = c;
  32.     last = get_link(last);
  33.     if(last == -1)
  34.     {
  35.         last = 0;
  36.         return;
  37.     }
  38.     if(!to[last][c])
  39.     {
  40.         len [sz]    = len[last] + 2;
  41.         link[sz][0] = to[get_link(link[last][0])][c];
  42.         for(int i = 1; i < logn; i++)
  43.             link[sz][i] = link[link[sz][i - 1]][i - 1];
  44.  
  45.         int cur = sz;
  46.         for(int i = logn - 1; i >= 0; i--)
  47.             if(2 * len[link[cur][i]] > len[sz])
  48.                 cur = link[cur][i];
  49.         cur = link[cur][0];
  50.         minr[sz] = min(minr[last] + 1, len[sz] / 2 - len[cur] + minr[cur] + 1);
  51.         to[last][c] = sz++;
  52.     }
  53.     last = to[last][c];
  54. }
  55.  
  56.  
  57. main()
  58. {
  59. //dfkjaskfjkas
  60.     int T;
  61.     cin >> T;
  62.     int tr[128];
  63.     tr['A'] = 0; tr['C'] = 1; tr['G'] = 2; tr['T'] = 3;
  64.     while(T--)
  65.     {
  66.         string S;
  67.         cin >> S;
  68.         int m = S.size();
  69.         init(m + 42);
  70.         int DP[m + 1];
  71.         memset(DP, 0, sizeof(DP));
  72.         for(int i = 1; i <= m; i++)
  73.         {
  74.             add_letter(tr[S[i - 1]]);
  75.             DP[i] = min(DP[i - 1] + 1, i - len[last] + minr[last] + 1);
  76.         }
  77.         cout << DP[m] << "\n";
  78.     }
  79.     return 0;
  80. }
  81.  
Runtime error #stdin #stdout 0.01s 12000KB
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https://ideone.com/5uCXeB
Virus Synthesis O(n log n)
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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