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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. #define f1(i, n) for(int i=1;i<=n;++i)
  4. #define all(x) x.begin(), x.end()
  5. using namespace std;
  6. const int MOD = 1e9 + 7;
  7. const int maxn = 1e6 + 5;
  8. int main() {
  9. 	ios::sync_with_stdio(false);
  10. 	cin.tie(nullptr);
  11.  
  12. 	int t;
  13. 	cin >> t;
  14. 	while (t--) {
  15. 		int n;
  16. 		string s;
  17. 		cin >> n >> s;
  18. 		int count_0 = 0, count_1 = 0, max_run_0 = 0, max_run_1 = 0;
  19. 		int curr_0 = 0, curr_1 = 0;
  20. 		for (int i = 0; i < s.size(); ++i) {
  21. 			if (s[i] == '0') {
  22. 				count_0++;
  23. 				curr_0++;
  24. 				max_run_0 = max(max_run_0, curr_0);
  25. 				curr_1 = 0;
  26. 			}
  27. 			else {
  28. 				count_1++;
  29. 				curr_1++;
  30. 				max_run_1 = max(max_run_1, curr_1);
  31. 				curr_0 = 0;
  32. 			}
  33. 		}
  34. 		cout << min(count_1 + 2 * (count_0 - max_run_0), count_0 + 2 * (count_1 - max_run_1)) << "\n";
  35. 	}
  36.  
  37.  
  38. 	return 0;
  39. }
  40.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/FxDgJw
language:
C++14 (gcc 8.3)
created:
7 days ago
visibility:
public

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