結果
問題 | No.985 Hadamard |
ユーザー |
|
提出日時 | 2024-04-03 22:43:30 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 315 ms / 2,000 ms |
コード長 | 4,507 bytes |
コンパイル時間 | 2,395 ms |
コンパイル使用メモリ | 200,988 KB |
最終ジャッジ日時 | 2025-02-20 19:58:06 |
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 23 |
ソースコード
#include<bits/stdc++.h>using namespace std;#pragma GCC optimize("Ofast")#define rep(i,n) for(ll i=0;i<n;i++)#define repl(i,l,r) for(ll i=(l);i<(r);i++)#define per(i,n) for(ll i=(n)-1;i>=0;i--)#define perl(i,r,l) for(ll i=r-1;i>=l;i--)#define fi first#define se second#define pb push_back#define ins insert#define pqueue(x) priority_queue<x,vector<x>,greater<x>>#define all(x) (x).begin(),(x).end()#define CST(x) cout<<fixed<<setprecision(x)#define vtpl(x,y,z) vector<tuple<x,y,z>>#define rev(x) reverse(x);using ll=long long;using vl=vector<ll>;using vvl=vector<vector<ll>>;using pl=pair<ll,ll>;using vpl=vector<pl>;using vvpl=vector<vpl>;const ll MOD=1000000007;const ll MOD9=998244353;const int inf=1e9+10;const ll INF=4e18;const ll dy[9]={1,0,-1,0,1,1,-1,-1,0};const ll dx[9]={0,1,0,-1,1,-1,1,-1,0};template<class T> inline bool chmin(T& a, T b) {if (a > b) {a = b;return true;}return false;}template<class T> inline bool chmax(T& a, T b) {if (a < b) {a = b;return true;}return false;}const int mod = MOD9;const int max_n = 2000050;struct mint {ll x; // typedef long long ll;mint(ll x=0):x((x%mod+mod)%mod){}mint operator-() const { return mint(-x);}mint& operator+=(const mint a) {if ((x += a.x) >= mod) x -= mod;return *this;}mint& operator-=(const mint a) {if ((x += mod-a.x) >= mod) x -= mod;return *this;}mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}mint operator+(const mint a) const { return mint(*this) += a;}mint operator-(const mint a) const { return mint(*this) -= a;}mint operator*(const mint a) const { return mint(*this) *= a;}mint pow(ll t) const {if (!t) return 1;mint a = pow(t>>1);a *= a;if (t&1) a *= *this;return a;}bool operator==(const mint &p) const { return x == p.x; }bool operator!=(const mint &p) const { return x != p.x; }// for prime modmint inv() const { return pow(mod-2);}mint& operator/=(const mint a) { return *this *= a.inv();}mint operator/(const mint a) const { return mint(*this) /= a;}};istream& operator>>(istream& is, mint& a) { return is >> a.x;}ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}using vm=vector<mint>;using vvm=vector<vm>;struct combination {vector<mint> fact, ifact;combination(int n):fact(n+1),ifact(n+1) {assert(n < mod);fact[0] = 1;for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;ifact[n] = fact[n].inv();for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;}mint operator()(int n, int k) {if (k < 0 || k > n) return 0;return fact[n]*ifact[k]*ifact[n-k];}}comb(max_n);// fast Walsh–Hadamard transformtemplate<class T>std::vector<T> fast_hadamard_transform(std::vector<T> vec) {using hadamard_size_type = typename std::vector<T>::size_type;auto vec_size = vec.size();// check vec_size is power of 2assert(((vec_size - 1)&vec_size) == 0);for(hadamard_size_type i = 1; i < vec_size; i = i << 1) {auto mask = ~i;for(auto j = i; j < vec_size; j = (j+1)|i) {T a = vec[j&mask];T &b = vec[j];vec[j&mask] += b;b = a - b;}}return vec;}// inverse fast Walsh–Hadamard transformtemplate<class VecType>auto inv_fast_hadamard_transform (VecType &&vec) {auto vec_size = vec.size();auto &&ret = fast_hadamard_transform(std::forward<VecType>(vec));for(auto &i : ret) i /= vec_size;return ret;}// bitwise xor convolution// using fast-Walsh–Hadamard-transformtemplate<class T>std::vector<T> xor_convolution(const std::vector<T> &a, const std::vector<T> &b) {using xorconv_size_type = typename std::vector<T>::size_type;assert(a.size() == b.size());auto vec_size = a.size();std::vector<T> &&transa = fast_hadamard_transform(a),&&transb = fast_hadamard_transform(b);for(xorconv_size_type i = 0; i < vec_size; i++) {transa[i] *= transb[i];}return inv_fast_hadamard_transform(transa);}int main(){ll n;cin >> n;vl c(1<<n);rep(i,1<<n)cin >> c[i];auto f=fast_hadamard_transform(c);//for(auto p:f)cout << p <<" ";cout << endl;mint ans=0;rep(i,1<<n){ll l,r;cin >> l >> r;if(f[i]<0)ans+=f[i]*l;else ans+=f[i]*r;}cout << ans/mint(2).pow(n) << endl;}