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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.  
  8.     int n;
  9.     cin >> n;
  10.  
  11.     int pole[300001];
  12.     for (int i = 0; i <= n; i++) {
  13.         cin >> pole[i];
  14.     }
  15.  
  16.     if (pole[0] == 1 || pole[n] == 1) {
  17.         cout << -1 << "\n";
  18.         return 0;
  19.     }
  20.  
  21.     int fib[50];
  22.     fib[0] = 1;
  23.     fib[1] = 2;
  24.     int ilosc = 2;
  25.     while (true) {
  26.         fib[ilosc] = fib[ilosc - 1] + fib[ilosc - 2];
  27.         if (fib[ilosc] > n) break;
  28.         ilosc++;
  29.     }
  30.     int dp[300001];
  31.     for (int i = 0; i <= n; i++) dp[i] = -1;
  32.     dp[0] = 0;
  33.     for (int i = 0; i <= n; i++) {
  34.         if (dp[i] == -1) continue;
  35.         for (int j = 0; j < ilosc; j++) {
  36.             int nastepny = i + fib[j];
  37.             if (nastepny <= n && pole[nastepny] == 0) {
  38.                 if (dp[nastepny] == -1 || dp[nastepny] > dp[i] + 1) {
  39.                     dp[nastepny] = dp[i] + 1;
  40.                 }
  41.             }
  42.         }
  43.     }
  44.     cout << dp[n] << "\n";
  45.     return 0;
  46. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/I4SPNv
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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