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  1. #include <bits/stdc++.h>
  2. #define pii pair<int, int>
  3. #define f first
  4. #define s second
  5. #define ll long long
  6. #define oo 2000000000
  7. #define piii pair<pii, int>
  8. #define pb push_back
  9. #define mp make_pair
  10.  
  11.  
  12. using namespace std;
  13.  
  14. const int up = 1e6 + 30;
  15. int n, k, a[up];
  16. ll pw[25];
  17.  
  18. pii work(int d) {
  19.     unordered_map<ll, int>cnt;
  20.     ll val = 0;
  21.     for(int i = 0; i < d; ++i) {
  22.         val = val * k + a[i];
  23.     }
  24.     cnt[val]++;
  25.     for(int i = d; i < n; ++i) {
  26.         val = val - pw[d - 1] * a[i - d];
  27.         val = val * k + a[i];
  28.         cnt[val]++;
  29.     }
  30.     if(cnt[val] == 1) return mp(d, 0);
  31.     else {
  32.         for(int s = 1; s <= d; ++s) {
  33.             val -= pw[d - s] * a[n - d + s - 1];
  34.             for(ll i = 0; i < pw[s]; ++i) {
  35.                 if(!cnt.count(val * pw[s] + i)) {
  36.                     return mp(d, s);
  37.                 }
  38.             }
  39.         }
  40.         return mp(0, 0);
  41.     }
  42. }
  43. void solve() {
  44.     cin >> n >> k;
  45.     for(int i = 0; i < n; ++i) {
  46.         cin >> a[i];
  47.         --a[i];
  48.     }
  49.     if(k == 1) {
  50.         cout << n << " 0\n";
  51.     }else { /// in base k
  52.         pw[0] = 1;
  53.         for(int i = 1; pw[i - 1] < n; ++i) {
  54.             pw[i] = pw[i - 1] * k;
  55.         }
  56.         for(int i = 1; i <= 20; ++i) {
  57.             pii cur = work(i);
  58.             if(cur.f != 0) {
  59.                 cout << cur.f << ' ' << cur.s << '\n';
  60.                 break;
  61.             }
  62.         }
  63.     }
  64. }
  65. int main()
  66. {
  67.     ios_base::sync_with_stdio(false);
  68.     int t = 1;
  69.     //cin >> t;
  70.     while(t--) {
  71.         solve();
  72.     }
  73.     return 0;
  74. }
  75.  
  76. /*
  77.  
  78. 10 2
  79. 1 2 1 1 2 2 1 2 1 1
  80.  
  81. */
  82.  
Success #stdin #stdout 0s 5604KB
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https://ideone.com/RKV331
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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