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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define fro(i, s, n) for (int i = int(s); i < int(n); i++)
  5. #define _fro(i, s, n) for (int i = int(s); i <= int(n); i++)
  6. #define rfro(i, s, n) for (int i = int(n); i >= int(s); i--)
  7. #define sz(a) int((a).size())
  8. #define ll long long
  9. #define pb push_back
  10. #define in insert
  11. #define F first
  12. #define S second
  13. #define E endl
  14. #define R return
  15. #define NL cout << endl;
  16. #define gcd(a, b) __gcd(a, b)
  17.  
  18. // ********************************** C O D E ********************************** //
  19.  
  20. const int N = 2e5 + 10;
  21. int a[N];
  22.  
  23. int main()
  24. {
  25.     int t;
  26.     scanf("%d", &t);
  27.  
  28.     while (t--)
  29.     {
  30.         int n;
  31.         scanf("%d", &n);
  32.  
  33.         int mx = 0;
  34.         fro(i, 0, n)
  35.         {
  36.             scanf("%d", &a[i]);
  37.             mx = max(mx, a[i]);
  38.         }
  39.  
  40.         if(n == mx)
  41.         {
  42.             printf("0\n");
  43.             continue;
  44.         }
  45.  
  46.         vector<pair<int, int>> v;
  47.         set<int> s;
  48.  
  49.         int l1 = n - mx, l2 = mx;
  50.         bool all = true;
  51.  
  52.         fro(i, 0, l1) s.in(a[i]);
  53.  
  54.         if (sz(s) == l1)
  55.             _fro(i, 1, l1) all &= (s.find(i) != s.end());
  56.  
  57.         else if (sz(s) != l1 || !all)
  58.         {
  59.             all = false;
  60.             goto skip;
  61.         }
  62.  
  63.         s.clear();
  64.  
  65.         fro(i, l1, n) s.in(a[i]);
  66.  
  67.         if (sz(s) == l2)
  68.             _fro(i, 1, l2) all &= (s.find(i) != s.end());
  69.  
  70.         else
  71.             all = false;
  72.  
  73.         if (all)
  74.             v.pb({l1, l2});
  75.  
  76.     skip:
  77.  
  78.         s.clear();
  79.         all = true;
  80.         l1 = mx, l2 = n - mx;
  81.  
  82.         fro(i, 0, l1) s.in(a[i]);
  83.  
  84.         if (sz(s) == l1)
  85.             _fro(i, 1, l1) all &= (s.find(i) != s.end());
  86.  
  87.         else if (sz(s) != l1 || !all)
  88.         {
  89.             all = false;
  90.             goto skip1;
  91.         }
  92.  
  93.         s.clear();
  94.  
  95.         fro(i, l1, n) s.in(a[i]);
  96.  
  97.         if (sz(s) == l2)
  98.             _fro(i, 1, l2) all &= (s.find(i) != s.end());
  99.  
  100.         else
  101.             all = false;
  102.  
  103.     skip1:
  104.  
  105.         if (all)
  106.             v.pb({l1, l2});
  107.  
  108.         printf("%d\n", sz(v));
  109.         for (auto x : v)
  110.             printf("%d %d\n", x.F, x.S);
  111.     }
  112. }
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https://ideone.com/a6yBAy
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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