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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. void solve() {
  6. 	int n;
  7. 	cin >> n;
  8. 	string s;
  9. 	cin >> s;
  10. 	map<char, int> last;
  11. 	int ans = 0;
  12. 	for(int i = 0; i < n; i++) {
  13. 		if(last.count(s[i])) {
  14. 			ans = max(ans, n - (i - last[s[i]]));
  15. 		}
  16. 		last[s[i]] = i;
  17. 	}
  18. 	cout << ans << endl;
  19. }
  20.  
  21. signed main() {
  22. 	int t;
  23. 	cin >> t;
  24. 	while(t--) {
  25. 		solve();
  26. 	}
  27. }
  28.  
Success #stdin #stdout 0.05s 4360KB
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https://ideone.com/cz9oQx
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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