fork(1) download
copy 
  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. typedef long long int lli;
  4.  
  5. int solve(string s, int n)
  6. {
  7. 	map <char, int> m;
  8. 	int i = 0, j = n - 1;
  9. 	for (; i <= j; i++, j--)
  10. 	{
  11. 		m[s[i]] = i;
  12. 		m[s[j]] = j;
  13. 	}
  14. 	typedef map <char, int> :: iterator mapitr;
  15. 	int min = INT_MAX;
  16. 	int max = 0;
  17. 	for (mapitr it = m.begin(); it != m.end(); it++)
  18. 	{
  19. 		int cur = it -> second;
  20. 		if (cur < min) min = cur;
  21. 		if (cur > max) max = cur;
  22. 	}
  23. 	return max - min + 1;
  24. }
  25.  
  26. int main()
  27. {
  28. 	ios_base::sync_with_stdio(false);
  29. 	cin.tie(NULL);
  30.  
  31. 	int n;
  32. 	cin >> n;
  33. 	string s;
  34. 	cin >> s;
  35. 	cout << solve(s, n) << endl;
  36.  
  37. 	return 0;
  38. }
Success #stdin #stdout 0s 4560KB
comments (?)
stdin
copy 
6
aaBCCe
stdout
copy 
5
https://ideone.com/Ps7R0N
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!