Submission #421420
Source Code Expand
#include <iostream> #include <complex> #include <vector> using namespace std; const int N = (1 << 18); const double PI = acos(-1); typedef complex<double> comp; vector<comp> dft(vector<comp> f, int n, bool doesinv) { if (n == 1) return f; vector<comp> f0, f1; for (auto i=0; i<n/2; i++) { f0.push_back(f[2*i]); f1.push_back(f[2*i+1]); } f0 = dft(f0, n/2, doesinv); f1 = dft(f1, n/2, doesinv); comp zeta; if (!doesinv) { zeta = comp(cos(2 * PI/n), sin(2 * PI/n)); } else { zeta = comp(cos(2 * PI/n), -1 * sin(2 * PI/n)); } comp pow_zeta = comp(1, 0); for (auto i=0; i<n; i++) { f[i] = f0[i % (n/2)] + pow_zeta * f1[i % (n/2)]; pow_zeta = pow_zeta * zeta; } return f; } vector<comp> multiply(vector<comp> g, vector<comp> h) { vector<comp> gg = dft(g, N, false); vector<comp> hh = dft(h, N, false); vector<comp> ff = vector<comp>(N); for (auto i=0; i<N; i++) { ff[i] = gg[i] * hh[i]; } vector<comp> ans = dft(ff, N, true); for (auto i=0; i<N; i++) { ans[i] = ans[i] / comp(N, 0); } return ans; } int main() { int n; cin >> n; vector<comp> f = vector<comp>(N, comp(0, 0)); vector<comp> g = vector<comp>(N, comp(0, 0)); int a, b; for (auto i=0; i<n; i++) { cin >> a >> b; f[i] = comp(a, 0); g[i] = comp(b, 0); } vector<comp> h = multiply(f, g); cout << 0 << endl; for (auto i=0; i<(2 * n - 1); i++) { cout << llround(h[i].real()) << endl; } }
Submission Info
Submission Time | |
---|---|
Task | C - 高速フーリエ変換 |
User | kazunetakahashi |
Language | C++14 (Clang++ 3.4) |
Score | 100 |
Code Size | 1521 Byte |
Status | AC |
Exec Time | 1758 ms |
Memory | 46576 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 100 / 100 | ||||
Status |
|
|
Set Name | Test Cases |
---|---|
Sample | 00_sample_01 |
All | 00_sample_01, 01_00_01, 01_01_19, 01_02_31, 01_03_22, 01_04_31, 01_05_40, 01_06_15, 01_07_39, 01_08_28, 01_09_30, 01_10_23, 01_11_33, 01_12_11, 01_13_28, 01_14_41, 01_15_26, 01_16_49, 01_17_34, 01_18_02, 01_19_33, 01_20_29, 02_00_51254, 02_01_82431, 02_02_17056, 02_03_34866, 02_04_6779, 02_05_65534, 02_06_65535, 02_07_65536, 02_08_65537, 02_09_65538, 02_10_100000 |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
00_sample_01 | AC | 1260 ms | 46512 KB |
01_00_01 | AC | 1239 ms | 46560 KB |
01_01_19 | AC | 1255 ms | 46460 KB |
01_02_31 | AC | 1230 ms | 46568 KB |
01_03_22 | AC | 1227 ms | 46568 KB |
01_04_31 | AC | 1233 ms | 46556 KB |
01_05_40 | AC | 1368 ms | 46576 KB |
01_06_15 | AC | 1226 ms | 46428 KB |
01_07_39 | AC | 1242 ms | 46568 KB |
01_08_28 | AC | 1234 ms | 46456 KB |
01_09_30 | AC | 1265 ms | 46568 KB |
01_10_23 | AC | 1257 ms | 46564 KB |
01_11_33 | AC | 1242 ms | 46564 KB |
01_12_11 | AC | 1265 ms | 46576 KB |
01_13_28 | AC | 1245 ms | 46576 KB |
01_14_41 | AC | 1248 ms | 46564 KB |
01_15_26 | AC | 1241 ms | 46452 KB |
01_16_49 | AC | 1231 ms | 46572 KB |
01_17_34 | AC | 1240 ms | 46572 KB |
01_18_02 | AC | 1232 ms | 46568 KB |
01_19_33 | AC | 1247 ms | 46564 KB |
01_20_29 | AC | 1235 ms | 46572 KB |
02_00_51254 | AC | 1591 ms | 46576 KB |
02_01_82431 | AC | 1697 ms | 46564 KB |
02_02_17056 | AC | 1338 ms | 46572 KB |
02_03_34866 | AC | 1409 ms | 46560 KB |
02_04_6779 | AC | 1272 ms | 46564 KB |
02_05_65534 | AC | 1566 ms | 46568 KB |
02_06_65535 | AC | 1571 ms | 46564 KB |
02_07_65536 | AC | 1619 ms | 46576 KB |
02_08_65537 | AC | 1587 ms | 46568 KB |
02_09_65538 | AC | 1577 ms | 46564 KB |
02_10_100000 | AC | 1758 ms | 46564 KB |