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  1. #include <iostream>
  2. #include <fstream>
  3. #include <vector>
  4. #include <algorithm>
  5.  
  6. struct Line
  7. {
  8.     int start{};
  9.     int end{};
  10.     int weight{};
  11. };
  12.  
  13. static const int size = 100;
  14.  
  15. int main()
  16. {
  17.     std::ifstream fin{"input.txt"};
  18.  
  19.     int N;
  20.     fin >> N;
  21.  
  22.     std::vector<Line> lines(size);
  23.  
  24.     for (int i{}; i < N; i++)
  25.     {
  26.         int num;
  27.         fin >> num;
  28.         Line& line = lines[num - 1];
  29.  
  30.         if (line.start == 0)
  31.             line.start = i;
  32.         line.end = i;
  33.         line.weight++;
  34.     }
  35.  
  36.     fin.close();
  37.  
  38.     std::sort(lines.begin(), lines.end(), [](const Line& a, const Line& b) {
  39.         return b.start > a.start;   
  40.     });
  41.  
  42.     std::vector<int> best(size);
  43.     for (int i{}; i < size; i++)
  44.     {
  45.         Line& line = lines[i];
  46.         best[i] = line.weight;
  47.  
  48.         for (int j{}; j < i; j++)            
  49.             if (lines[j].end < line.start)
  50.                 best[i] = std::max(best[i], best[j] + line.weight);
  51.     }
  52.  
  53.     std::ofstream fout{"output.txt"};
  54.     fout << *std::max_element(best.begin(), best.end());
  55.     fout.close();
  56.  
  57.     return 0;
  58. }
Success #stdin #stdout 0s 3456KB
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Standard output is empty
https://ideone.com/qbcLKs
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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