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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define int long long
  5. #define sz(x) x.size()
  6. #define all(v) v.begin(), v.end()
  7. #define allr(v) v.rbegin(), v.rend()
  8. #define F first
  9. #define S second
  10.  
  11. void solve()
  12. {
  13.     string s; cin >> s;
  14.     set<string> st;
  15.     int n = sz(s), len = 0;
  16.     for (int i = 0; i < n; ++i)
  17.         for (int j = i; j < n; ++j)
  18.             st.insert(s.substr(i, j - i + 1));
  19.     for (string str : st)
  20.     {
  21.         bool good = true;
  22.         for (char &ch : str)
  23.         {
  24.             if (ch != 'A' && ch != 'C' && ch != 'G' && ch != 'T')
  25.             {
  26.                 good = false;
  27.                 break;
  28.             }
  29.         }
  30.         if (good)
  31.             len = max(len, (int)sz(str));
  32.     }        
  33.     cout << len;
  34. }
  35.  
  36. signed main()
  37. {
  38.     ios_base::sync_with_stdio(false), cin.tie(nullptr);
  39.     int tc = 1;
  40.     // cin >> tc;
  41.     while (tc--)
  42.     {
  43.         solve();
  44.         if (tc)
  45.             cout << '\n';
  46.     }
  47.     return 0;
  48. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/oeBDmQ
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

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