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  1. #include<bits/stdc++.h>
  2. // #pragma GCC optimize("Ofast")
  3. // #pragma GCC target("avx,avx2,fma")
  4. // #pragma GCC optimization("unroll-loops")
  5. // #pragma GCC optimize("unroll-loops")
  6. // #pragma GCC optimize("fast-math")
  7. // #pragma GCC optimize("no-stack-protector")
  8. // #define ll __int128
  9. #define ll long long
  10. // #define ll int
  11. #define f(i,a,b) for(ll i=a;i<b;i++)
  12. #define mod 1000000007
  13. // #define mod 998244353 
  14. #define mp make_pair
  15. #define uniq(v) (v).erase(unique(all(v)),(v).end())
  16. #define ff first
  17. #define ss second
  18. #define rf(i,a,b) for(ll i=a;i>=b;i--)
  19. #define sc(a) scanf("%lld",&a)
  20. #define pf printf
  21. #define sz(a) (int)(a.size())
  22. #define psf push_front
  23. #define ppf pop_front
  24. #define ppb pop_back
  25. #define pb push_back
  26. #define pq priority_queue
  27. #define all(s) s.begin(),s.end()
  28. #define sp(a) setprecision(a)
  29. #define rz resize
  30. #define ld long double
  31. #define inf (ll)1e18
  32. #define ub upper_bound
  33. #define lb lower_bound
  34. #define bs binary_search
  35. #define eb emplace_back
  36. const double pi = acos(-1);
  37. ll binpow(ll a, ll b){ll res=1;while(b!=0){if(b&1)res*=a;a*=a;b>>=1;}return res;}
  38. ll binpow(ll a, ll b, ll md){ll res=1;a%=md;if(a==0)return 0;while(b!=0){if(b&1)res*=a,res%=md;a*=a,a%=md;b>>=1;}return res%md;}
  39.  
  40. using namespace std;
  41.  
  42. void rotate(ll l, ll r, vector<ll> &a)
  43. {
  44.     ll n=sz(a),temp=a[r],id=r;
  45.     while(id>l)
  46.         a[id]=a[id-1],id--;
  47.     a[l]=temp;
  48. }
  49.  
  50. int main()
  51. {
  52.     ios_base::sync_with_stdio(false);
  53.     cin.tie(NULL);
  54.     // freopen("xortransform.in","r",stdin);
  55.     // freopen("xortransform.out","w",stdout);
  56. // #ifndef ONLINE_JUDGE
  57. //     freopen("input.txt","r",stdin);
  58. //     freopen("output.txt","w",stdout);
  59. // #endif
  60.     int z=1;
  61.     cin>>z;
  62.     f(i,1,z+1)
  63.     {
  64.         //cout<<"Case #"<<i<<": ";
  65.         ll n;
  66.         cin>>n;
  67.         vector<ll> a(n+1);
  68.         f(i,1,n+1)
  69.             cin>>a[i];
  70.  
  71.         bool flag=1;
  72.         f(i,1,n+1)
  73.         {
  74.             if(a[i]!=i)
  75.             {
  76.                 flag=0;
  77.                 break;
  78.             }
  79.         }
  80.         if(flag)
  81.         {
  82.             cout<<"0\n";
  83.             continue;
  84.         }
  85.  
  86.         ll pidx=0,sidx=n+1;
  87.         f(i,1,n+1)
  88.         {
  89.             if(a[i]==i)
  90.                 pidx=i;
  91.             else
  92.                 break;
  93.         }
  94.         rf(i,n,1)
  95.         {
  96.             if(a[i]==i)
  97.                 sidx=i;
  98.             else
  99.                 break;
  100.         }
  101.         flag=1;
  102.         f(i,pidx+1,sidx)
  103.         {
  104.             if(a[i]==i)
  105.             {
  106.                 flag=0;
  107.                 break;
  108.             }
  109.         }
  110.         if(flag)
  111.         {
  112.             cout<<"1\n"<<pidx+1<<" "<<sidx-1<<"\n";
  113.             f(i,1,n+1)
  114.                 cout<<i<<" ";
  115.             cout<<"\n";
  116.             continue;
  117.         }
  118.  
  119.         cout<<"2\n1 "<<n<<"\n";
  120.         vector<ll> ta=a;
  121.         flag=0;
  122.         f(i,1,n+10)
  123.         {
  124.             rotate(1,n,a);
  125.             flag=1;
  126.             f(j,1,n+1)
  127.             {
  128.                 if(a[j]==j || a[j]==ta[j])
  129.                 {
  130.                     flag=0;
  131.                     break;
  132.                 }
  133.             }
  134.             if(flag)
  135.                 break;
  136.         }
  137.         if(flag)
  138.         {
  139.             f(i,1,n+1)
  140.                 cout<<a[i]<<" ";
  141.             cout<<"\n";
  142.         }
  143.         else
  144.         {
  145.             swap(a[1],a[2]),flag=0;
  146.             f(i,1,n+10)
  147.             {
  148.                 rotate(1,n,a);
  149.                 flag=1;
  150.                 f(j,1,n+1)
  151.                 {
  152.                     if(a[j]==j || a[j]==ta[j])
  153.                     {
  154.                         flag=0;
  155.                         break;
  156.                     }
  157.                 }
  158.                 if(flag)
  159.                     break;
  160.             }
  161.             f(i,1,n+1)
  162.                 cout<<a[i]<<" ";
  163.             cout<<"\n";
  164.         }
  165.         cout<<"1 "<<n<<"\n";
  166.         f(i,1,n+1)
  167.             cout<<i<<" ";
  168.         cout<<"\n";
  169.     }
  170. }
Runtime error #stdin #stdout #stderr 0.01s 5520KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc
https://ideone.com/l1NRA8
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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