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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define faster ios_base::sync_with_stdio(false); cin.tie(NULL)
  4. #define Bit(mask , i) ((mask >> i) & 1)
  5. #define fi first
  6. #define se second
  7. #define _LOG2(nl) 31 - __builtin_clz(nl)
  8. #define c_bit(nl) __builtin_popcount(nl)
  9. #define li pair<long long , int>
  10. #define db double
  11. #define onBit(mask , i) (mask | (1 << i))
  12. #define offBit(mask , i) (mask & (~(1 << i)))
  13.  
  14. const long long MOD = 1e9 + 7;
  15. const long long INF = 1e14;
  16. const int N = 3e5 + 7;
  17. int z[N] , kmp[N];
  18. int s[N];
  19. int n;
  20.  
  21. void inp(){
  22.     cin >> n;
  23.     for (int i = 1 ; i <= n ; ++i) cin >> s[i];
  24. }
  25.  
  26. bool check(int k){
  27.     int i = 1;
  28.     while (i <= n){
  29.         if (z[i] < min(k , n - i + 1)) return 0;
  30.         i += k;
  31.     }
  32.     return 1;
  33. }
  34.  
  35. void solve(){
  36. //    int k = kmp[1] = 0;
  37. //    for (int i = 2 ; i <= n ; ++i){
  38. //        while (k > 0 && s[i] != s[k + 1]) k = kmp[k];
  39. //        kmp[i] = s[i] == s[k + 1] ? ++k : 0;
  40. //    }
  41.     for (int i = 1 , l = 2 , r = 1 ; i <= n ; ++i){
  42.         if (i <= r)
  43.             z[i] = min(r - i + 1 , z[i - l + 1]);
  44.         while (i + z[i] <= n && s[1 + z[i]] == s[i + z[i]])
  45.             ++z[i];
  46.         if (i + z[i] - 1 > r){
  47.             l = i;
  48.             r = i + z[i] - 1;
  49.         }
  50.     }
  51.     for (int i = 1 ; i <= n ; ++i){
  52.         if (check(i)){
  53.             cout << i;
  54.             return;
  55.         }
  56.     }
  57. }
  58.  
  59. int main(){
  60. //	freopen("xhmax.inp" , "r" , stdin);
  61. //	freopen("xhmax.out" , "w" , stdout);
  62.     faster;
  63.     inp();
  64.     solve();
  65.     return 0;
  66. }
  67.  
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/DjF7SZ
language:
C++14 (gcc 8.3)
created:
11 hours ago
visibility:
public

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