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Submission #15049

# Submission time Handle Problem Language Result Execution time Memory
15049 2015-07-11T07:27:21 Z hongjun7 씽크스몰 (kriii3_TT) C++14
0 / 30
 0 ms 1676 KB 
#include <cstdio>
#define _USE_MATH_DEFINES
#include <math.h>
#include <complex>
#include <vector>
#include <algorithm>
using namespace std;
#define sz(v) ((int)(v).size())
#define all(v) (v).begin(),(v).end()
typedef complex<double> base;
typedef long long ll;
void fft(vector <base> &a, bool invert) {
	int n = sz(a);
	for (int i = 1, j = 0; i<n; i++) {
		int bit = n >> 1;
		for (; j >= bit; bit >>= 1) j -= bit;
		j += bit;
		if (i < j) swap(a[i], a[j]);
	}
	for (int len = 2; len <= n; len <<= 1) {
		double ang = 2 * M_PI / len*(invert ? -1 : 1);
		base wlen(cos(ang), sin(ang));
		for (int i = 0; i<n; i += len) {
			base w(1);
			for (int j = 0; j<len / 2; j++) {
				base u = a[i + j], v = a[i + j + len / 2] * w;
				a[i + j] = u + v;
				a[i + j + len / 2] = u - v;
				w *= wlen;
			}
		}
	}
	if (invert) {
		for (int i = 0; i<n; i++) a[i] /= n;
	}
}
void multiply(const vector<int> &a, const vector<int> &b, vector<long long> &res) {
	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);
	res.resize(n);
	for (int i = 0; i < n; i++) res[i] = (ll)(fa[i].real() + (fa[i].real()>0 ? 0.5 : -0.5));
	ll r = res[0];
	for (int i = 1; i < n; i++) r ^= res[i];
	printf("%lld", r);
}
int n, m, x;
int main() {
	scanf("%d%d", &n, &m);
	vector <int> a(n + 1), b(m + 1);
	vector <ll> res;
	for (int i = 0; i <= n; i++) scanf("%d", &a[i]);
	for (int i = 0; i <= m; i++) scanf("%d", &b[i]);
	multiply(a, b, res);
}

Subtask #1
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 1676 KB Output is correct
2 Correct 0 ms 1676 KB Output is correct
3 Incorrect 0 ms 1676 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Halted 0 ms 0 KB -

Subtask #3
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Halted 0 ms 0 KB -