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  1. #include <bits/stdc++.h>
  2.  
  3. #define ll long long 
  4. #define el cout << '\n'
  5. #define ic pair<int, int>
  6. #define fi first 
  7. #define se second
  8.  
  9. using namespace std;
  10.  
  11. const int maxn = 1e6;
  12. const int INF = 1e9;
  13.  
  14. struct Node
  15. {
  16.     ic best_1, best_2;
  17.  
  18.     Node(ic best_1 = ic(INF, '#'), ic best_2 = ic(INF, '#')) :
  19.         best_1(best_1), best_2(best_2) {};
  20. };
  21.  
  22. int n, ans = INF;
  23. Node dp[maxn + 10][5];
  24. string s;
  25.  
  26. char get_char(char c, int v)
  27. {
  28.     v -= 2;
  29.     c += v;
  30.     if (c < 'a')
  31.         c += 'z' - 'a' + 1;
  32.     if (c > 'z')
  33.         c -= 'z' - 'a' + 1;
  34.     return c;
  35. }
  36. void minimize(Node &a, ic b)
  37. {
  38.     if (a.best_1.fi >= b.fi)
  39.     {
  40.         if (a.best_1.se != b.se)
  41.             a.best_2 = a.best_1;
  42.         a.best_1 = b;
  43.     }
  44.     else if (a.best_2.fi >= b.fi && a.best_1.se != b.se)
  45.         a.best_2 = b;
  46. }
  47.  
  48. int main()
  49. {
  50.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  51.     if (fopen("REMOVEPALIN.INP", "r"))
  52.     {
  53.         freopen("REMOVEPALIN.INP", "r", stdin);
  54.         freopen("REMOVEPALIN.OUT", "w", stdout);
  55.     }
  56.  
  57.     cin >> s;
  58.     n = s.size();
  59.     s = ' ' + s;
  60.     if (n == 1)
  61.         return cout << 0, 0;
  62.     for (int y = 0; y <= 4; y++)
  63.         for (int x = 0; x <= 4; x++)
  64.             if (get_char(s[2], y) != get_char(s[1], x))
  65.                 minimize(dp[2][y], ic(abs(y - 2) + abs(x - 2), get_char(s[1], x)));
  66.     for (int i = 3; i <= n; i++)
  67.     {
  68.         for (int y = 0; y <= 4; y++)
  69.         {
  70.             for (int x = 0; x <= 4; x++)
  71.             {
  72.                 if (get_char(s[i - 1], x) == get_char(s[i], y))
  73.                     continue;
  74.                 if (get_char(s[i], y) != dp[i - 1][x].best_1.se)
  75.                     minimize(dp[i][y], ic(dp[i - 1][x].best_1.fi + abs(y - 2), get_char(s[i - 1], x)));
  76.                 if (get_char(s[i], y) != dp[i - 1][x].best_2.se)
  77.                     minimize(dp[i][y], ic(dp[i - 1][x].best_2.fi + abs(y - 2), get_char(s[i - 1], x)));
  78.             }
  79.         }
  80.     }
  81.     // for (int i = 2; i <= n; i++)
  82.     //     for (int y = 0; y <= 4; y++)
  83.     //         cout << i << ' ' << get_char(s[i], y) << ' ' << dp[i][y].best_1.fi << ' ' << (char)dp[i][y].best_1.se << ' ' << dp[i][y].best_2.fi << ' ' << (char)dp[i][y].best_2.se, el;
  84.     for (int x = 0; x <= 4; x++)
  85.         ans = min(ans, dp[n][x].best_1.fi);
  86.     cout << ans;
  87. }
Success #stdin #stdout 0.03s 81732KB
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stdin
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Standard input is empty
stdout
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1000000000
https://ideone.com/oy3ghf
language:
C++14 (gcc 8.3)
created:
6 days ago
visibility:
public

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