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  1. #include "bits/stdc++.h"
  2. using namespace std;
  3. #define max(a, b) (a < b ? b : a)
  4. #define min(a, b) ((a > b) ? b : a)
  5. #define mod 1e9 + 7
  6. #define FOR(a, c) for (int(a) = 0; (a) < (c); (a)++)
  7. #define FORL(a, b, c) for (int(a) = (b); (a) <= (c); (a)++)
  8. #define FORR(a, b, c) for (int(a) = (b); (a) >= (c); (a)--)
  9. #define INF 1000000000000000003
  10. typedef long long int ll;
  11. typedef vector<int> vi;
  12. typedef pair<int, int> pi;
  13. #define F first
  14. #define S second
  15. #define PB push_back
  16. #define POB pop_back
  17. #define MP make_pair
  18. int main()
  19. {
  20. 	ios::sync_with_stdio(0);
  21. 	cin.tie(0);
  22. 	int T;
  23. 	cin >> T;
  24. 	while (T--) {
  25. 		int N;
  26. 		cin >> N;
  27.         int num,temp=0,flag=0;
  28.         int arr[1002]={0};
  29. 		FOR(i, N)
  30. 		{
  31. 		    cin >> num;
  32. 		    if((arr[num]!=0)&&(num!=temp))
  33.             {
  34.                 cout<<"NO\n";
  35.                 flag=1;
  36.             }
  37.             arr[num]++;
  38.             temp=num;
  39. 		}
  40. 		if(flag==1)
  41.             continue;
  42. 		set<int> s;
  43. 		int c=0;
  44. 		FOR(i,1002)
  45. 		{
  46. 		    if(arr[i]!=0)
  47.             {
  48.                 s.insert(arr[i]);
  49.                 c++;
  50.             }
  51. 		}
  52. 		if(c==s.size())
  53.             cout<<"YES\n";
  54.         else
  55.             cout<<"NO\n";
  56. 	}
  57. 	return 0;
  58. }
  59.  
Success #stdin #stdout 0s 4388KB
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https://ideone.com/MwSKfN
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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