Submission #1438732
Source Code Expand
#include <bits/stdc++.h> #define ll long long #define INF 1000000005 #define MOD 1000000007 #define EPS 1e-10 #define rep(i,n) for(int i=0;i<(int)n;++i) #define each(a, b) for(auto (a): (b)) #define all(v) (v).begin(),(v).end() #define fi first #define se second #define pb push_back #define show(x) cout <<#x<<" = "<<(x)<<endl #define spair(p) cout <<#p<<": "<<p.fi<<" "<<p.se<<endl #define svec(v) cout<<#v<<":";rep(kbrni,v.size())cout<<" "<<v[kbrni];cout<<endl #define sset(s) cout<<#s<<":";each(kbrni,s)cout <<" "<<kbrni;cout<<endl using namespace std; typedef pair<int,int>P; typedef complex<double>C; const int MAX_N = 100005; const double PI = 4*atan(1.0); vector<C> FFT(double theta, const vector<C>& a){ int n = (int)a.size(); vector<C> ret = a; for(int m=n; m>=2; m>>=1){ int mh = m>>1; rep(i,mh){ C w = exp(i*theta*C(0,1)); for(int j=i; j<n; j+=m){ int k = j+mh; C x = ret[j] - ret[k]; ret[j] += ret[k]; ret[k] = w*x; } } theta *= 2; } int i=0; for(int j=1; j<n-1; j++){ for(int k=n>>1; k>(i^=k); k>>= 1){ } if(j < i) swap(ret[i], ret[j]); } return ret; } //畳み込み template<class T> vector<T> Convolution(const vector<T> &lhs, const vector<T> &rhs){ int n = 1; while(n < (int)max(lhs.size(), rhs.size())*2){ n <<= 1; } vector<C> temp1(n); vector<C> temp2(n); for(int i=0; i<n/2; i++){ if(i < (int)lhs.size()){ temp1[i] = C(lhs[i], 0); } if(i < (int)rhs.size()){ temp2[i] = C(rhs[i], 0); } } //FFTにかけて周波数分解 temp1 = FFT(2.0*PI/n, temp1); temp2 = FFT(2.0*PI/n, temp2); //周波数同士で掛け算 rep(i,n){ temp1[i] *= temp2[i]; } //逆FFTをかけて元に戻す temp1 = FFT(-2.0*PI/n, temp1); vector<T> ret(n); rep(i,n){ ret[i] = (T)(temp1[i].real()/n + 0.5); //T=intの時用 } return ret; } int main() { int n; cin >> n; ios:sync_with_stdio(false); cin.tie(0); vector<int> a(n),b(n); rep(i,n){ cin >> a[i] >> b[i]; } vector<int> res = Convolution(a,b); cout << 0 << endl; rep(i,2*n-1){ cout << res[i] << endl; } }
Submission Info
Submission Time | |
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Task | C - 高速フーリエ変換 |
User | kopricky |
Language | C++14 (GCC 5.4.1) |
Score | 0 |
Code Size | 2462 Byte |
Status | CE |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:88:30: error: ‘sync_with_stdio’ was not declared in this scope ios:sync_with_stdio(false); ^