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Submission #526086

# Submission time Handle Problem Language Result Execution time Memory
526086 2022-02-13T17:02:51 Z eric00513 씽크스몰 (kriii3_TT) C++17
0 / 30
 399 ms 22068 KB 
#include <bits/stdc++.h>
using namespace std;

#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()

using ll = long long;
using base = complex<long double>;

const long double PI = acos(-1.L);

void fft(vector<base>& a, bool inv) {
	int n = sz(a);
	for (int i = 1, j = 0; i < n; i++) {
		int bit = n >> 1;
		while (j >= bit) j -= bit, bit >>= 1;
		j += bit;
		if (i < j) swap(a[i], a[j]);
	}
	for (int len = 2; len <= n; len <<= 1) {
		vector<base> w(len >> 1);
		for (int i = 0; i < (len >> 1); i++) {
			long double ang = 2 * PI * i / len * (inv ? -1 : 1);
			w[i] = base(cos(ang), sin(ang));
		}
		for (int i = 0; i < n; i += len) {
			for (int j = 0; j < len / 2; j++) {
				base u = a[i + j], v = a[i + j + len / 2] * w[j];
				a[i + j] = u + v;
				a[i + j + len / 2] = u - v;
			}
		}
	}
	if (inv) for (int i = 0; i < n; i++) a[i] /= n;
}

vector<ll> multiply(vector<int>& a, vector<int>& b) {
	vector<base> fa(all(a)), fb(all(b));
	int n = 1;
	while (n < max(sz(a), sz(b))) n <<= 1;
	fa.resize(n), fb.resize(n);
	fft(fa, false); fft(fb, false);
	for (int i = 0; i < n; i++) fa[i] *= fb[i];
	fft(fa, true);
	vector<ll> ret(n);
	for (int i = 0; i < n; i++) ret[i] = (ll)(fa[i].real() + (fa[i].real() > 0 ? 0.5 : -0.5));
	return ret;
}

int main() {
	cin.tie(0);
	ios_base::sync_with_stdio(0);

	int n, m;
	cin >> n >> m;
	n++, m++;
	vector<int> a(n), b(m);
	for (int i = 0; i < n; i++) cin >> a[i];
	for (int i = 0; i < m; i++) cin >> b[i];

	vector<ll> res = multiply(a, b);
	ll ans = 0;
	for (auto& i : res) ans ^= i;
	cout << ans << '\n';
	return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 19 ms 1736 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 399 ms 22068 KB Output isn't correct
2 Halted 0 ms 0 KB -