Submission #1028206

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028206		vjudge1	Fibonacci representations (CEOI18_fib)	C++17	0 / 100	207 ms	592 KiB

fib

#include <bits/stdc++.h>
using namespace std;

#define int long long

const int N = 1e2+2, mod = 1e9+7;

int n, a[N], b[N], /*f[N],*/ dp[2][N];

signed main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);
  
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }

/*
  f[1] = 1;
  f[2] = 2;
  for (int i = 3; i < N; i++) {
    f[i] = (f[i-1] + f[i-2]) % mod;
  }
  */

  //int sum = 0;
  //int SZ = 0;
  for (int i = 0; i < n; i++) {
    //sum += f[a[i]];
    //SZ++;

    b[i] = a[i];
    sort(b, b+i+1);
/** 
    if (i >= 1 && b[1] == 1) {
      b[0] = 2;
      for (int j = 1; j+1 <= i; j++) {
        b[j] = b[j+1];
      }
      SZ--;
    }
    */

    for (int j = 0; j <= i/*SZ*/; j++) {
      dp[0][j] = dp[1][j] = 0;

      // puedo coger desde b[j]
      int sz = b[j] - (j ? b[j-1] : 0) - 1;
      dp[0][j] += (1 + sz/2) * (j ? dp[0][j-1] : 1) % mod;
      dp[0][j] %= mod;

      if (j) {
        sz++;
        dp[0][j] += (1 + sz/2) * dp[1][j-1] % mod;
        dp[0][j] %= mod;
      }

      // puedo coger desde b[j]-1
      sz = b[j] - (j ? b[j-1] : 0) - 1;
      dp[1][j] += (sz/2) * (j ? dp[0][j-1] : 1) % mod;
      dp[1][j] %= mod;

      if (j) {
        sz++;
        dp[1][j] += (sz/2) * dp[1][j-1] % mod;
        dp[1][j] %= mod;
      }
    }

    cout << dp[0][i/*SZ-1*/] << "\n";
  }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 20
• Subtask 3: 0 / 15
• Subtask 4: 0 / 10
• Subtask 5: 0 / 15
• Subtask 6: 0 / 35