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  1. #include <cmath>
  2. #include <iostream>
  3. #include <vector>
  4. #include <algorithm>
  5. #include <string>
  6. #include <set>
  7. #include <map>
  8. #include <list>
  9. #include <time.h>
  10. #include <math.h>
  11. #include <random>
  12. #include <deque>
  13. #include <queue>
  14. #include <cassert>
  15. #include <unordered_map>
  16. #include <unordered_set>
  17. #include <iomanip>
  18. #include <bitset>
  19. #include <sstream>
  20. #include <chrono>
  21. #include <cstring>
  22.  
  23. using namespace std;
  24.  
  25. typedef long long ll;
  26.  
  27. #ifdef iq
  28.   mt19937 rnd(228);
  29. #else
  30.   mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
  31. #endif
  32.  
  33. int main() {
  34. #ifdef iq
  35.   freopen("a.in", "r", stdin);
  36. #endif
  37.   ios::sync_with_stdio(0);
  38.   cin.tie(0);
  39.   int t;
  40.   cin >> t;
  41.   while (t--) {
  42.     int n;
  43.     cin >> n;
  44.     string s;
  45.     cin >> s;
  46.     map <char, vector <int> > mp;
  47.     for (int i = 0; i < (int) s.size(); i++) {
  48.       mp[s[i]].push_back(i);
  49.     }
  50.     int ans = 0;
  51.     for (auto c : mp) {
  52.       for (int i = 0; i + 1 < (int) c.second.size(); i++) {
  53.         ans = max(ans, c.second[i] + n - c.second[i + 1]);
  54.       }
  55.     }
  56.     cout << ans << endl;
  57.   }
  58. }
Success #stdin #stdout 0.04s 4236KB
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https://ideone.com/fb3H1N
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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