# | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
972441 | 2024-04-30T12:29:43 Z | Charizard2021 | Fibonacci representations (CEOI18_fib) | C++17 | 0 ms | 0 KB |
#include<bits/stdc++.h> using namespace std; const int MOD = 1e9 + 7; map<int, int> mp; void getValues(int x){ if(mp[x] != 0){ if(mp[x] == 1){ if(x >= 1 && mp[x - 1] != 0){ mp[x - 1]--; mp[x]--; mp[x + 1]++; getValues(x + 1); } else if(mp[x + 1] != 0) { mp[x]--; mp[x + 1]--; mp[x + 2]++; getValues(x + 2); } } else{ mp[x] = 0; mp[x + 1]++; getValues(x + 1); if(x > 1){ mp[x - 2]++; getValues(x - 2); } else if(x == 1){ mp[0]++; getValues(0); } } } } int main(){ int n; cin >> n; for(int i = 0; i < n; i++){ int x; cin >> x; x--; mp[x]++; getValues(x); vector<long long> a; for(auto it : mp){ if(it.second != 0){ a.push_back(it.first); } } vector<long long> dp((int)a.size()); dp[0] = a[0]/2; int ans = 1; for(int j = 1; j < (int)a.size(); j++){ dp[j] = ((a[j] - a[j - 1])/2LL * dp[j - 1] + (a[j] - a[j - 1] - 1)/2Ll * ans) % MOD; ans += dp[j - 1]; ans %= MOD; } cout << ans + dp.back() << "\n"; } }