結果
問題 | No.2890 Chiffon |
ユーザー |
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提出日時 | 2024-09-13 21:42:34 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 497 ms / 2,000 ms |
コード長 | 3,191 bytes |
コンパイル時間 | 2,013 ms |
コンパイル使用メモリ | 201,864 KB |
最終ジャッジ日時 | 2025-02-24 07:24:14 |
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 53 |
ソースコード
#include <bits/stdc++.h>using namespace std;using std::cout;using std::cin;using std::endl;using ll=long long;using ld=long double;const ll ILL=2167167167167167167;const int INF=2100000000;#define rep(i,a,b) for (int i=(int)(a);i<(int)(b);i++)#define all(p) p.begin(),p.end()template<class T> using _pq = priority_queue<T, vector<T>, greater<T>>;template<class T> ll LB(vector<T> &v,T a){return lower_bound(v.begin(),v.end(),a)-v.begin();}template<class T> ll UB(vector<T> &v,T a){return upper_bound(v.begin(),v.end(),a)-v.begin();}template<class T> bool chmin(T &a,T b){if(a>b){a=b;return 1;}else return 0;}template<class T> bool chmax(T &a,T b){if(a<b){a=b;return 1;}else return 0;}template<class T> void So(vector<T> &v) {sort(v.begin(),v.end());}template<class T> void Sore(vector<T> &v) {sort(v.begin(),v.end(),[](T x,T y){return x>y;});}bool yneos(bool a,bool upp=0){if(a){cout<<(upp?"YES\n":"Yes\n");}else{cout<<(upp?"NO\n":"No\n");}return a;}template<class T> void vec_out(vector<T> &p,int ty=0){if(ty==2){cout<<'{';for(int i=0;i<(int)p.size();i++){if(i){cout<<",";}cout<<'"'<<p[i]<<'"';}cout<<"}\n";}else{if(ty==1){cout<<p.size()<<"\n";}for(int i=0;i<(int)(p.size());i++){if(i) cout<<" ";cout<<p[i];}cout<<"\n";}}template<class T> T vec_min(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmin(ans,x);return ans;}template<class T> T vec_max(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmax(ans,x);return ans;}template<class T> T vec_sum(vector<T> &a){T ans=T(0);for(auto &x:a) ans+=x;return ans;}int pop_count(long long a){int res=0;while(a){res+=(a&1),a>>=1;}return res;}template<class T> bool inside(T l,T x,T r){return l<=x&&x<r;}void solve();// CYAN / FREDERICint main() {ios::sync_with_stdio(false);cin.tie(nullptr);int t = 1;// cin >> t;rep(i, 0, t) solve();}void solve(){int N, K;cin >> N >> K;vector<int> A(K);rep(i, 0, K) cin >> A[i];rep(i, 0, K) A.push_back(A[i] + 2 * N);vector<int> p(N), nx(N);ll L = 0;rep(i, 0, K * 2){while (L != N && L * 2 < A[i]) nx[L] = A[i + 1] / 2 + 1, p[L++] = A[i] / 2 + 1;}int l = 0, r = N / K + 1;auto mul = [&](vector<int> a, vector<int> b) -> vector<int> {vector<int> c(a.size());rep(i, 0, a.size()) c[i] = a[b[i]];return c;};auto my_pow = [&](vector<int> f, int t) -> vector<int> {vector<int> res(f.size());rep(i, 0, f.size()) res[i] = i;while (t){if (t & 1) res = mul(f, res);t /= 2;if (t) f = mul(f, f);}return res;};while (r - l > 1){int m = (r + l) / 2;vector<int> q(N * 2 + 1);q[N * 2] = N * 2;rep(i, 0, N){q[i] = max(i + m, p[i]);if (q[i] >= nx[i]) q[i] = N * 2;q[i + N] = min(N * 2, q[i] + N);}//cout << m << "\n";//vec_out(q);q = my_pow(q, K);//vec_out(q);rep(i, 0, N) if (q[i] <= i + N) l = m;if (l != m) r = m;}//vec_out(nx);//vec_out(p);//vec_out(A);cout << l * 2 << "\n";}