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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.     int n;
  8.     cin >> n;
  9.     int pole[300001];
  10.     for (int i = 0; i <= n; i++) {
  11.         cin >> pole[i];
  12.     }
  13.     if (pole[0] == 1 || pole[n] == 1) {
  14.         cout << -1 << "\n";
  15.         return 0;
  16.     }
  17.     int fib[50];
  18.     fib[0] = 1;
  19.     fib[1] = 2;
  20.     int ilosc = 2;
  21.     while (true) {
  22.         fib[ilosc] = fib[ilosc - 1] + fib[ilosc - 2];
  23.         if (fib[ilosc] > n) break;
  24.         ilosc++;
  25.     }
  26.     int dp[300001];
  27.     for (int i = 0; i <= n; i++) dp[i] = -1;
  28.     dp[0]=0;
  29.     for (int i = 0; i <= n; i++) {
  30.         if (dp[i] == -1) continue;
  31.         for (int j = 0; j < ilosc; j++) {
  32.             int nastepny = i + fib[j];
  33.             if (nastepny <= n && pole[nastepny] == 0) {
  34.                 if (dp[nastepny] == -1 || dp[nastepny] > dp[i] + 1) {
  35.                     dp[nastepny] = dp[i] + 1;
  36.                 }
  37.             }
  38.         }
  39.     }
  40.     cout << dp[n] << "\n";
  41.     return 0;
  42. }
Success #stdin #stdout 0.01s 5780KB
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https://ideone.com/OssVm0
language:
C++ (gcc 8.3)
created:
10 days ago
visibility:
public

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