답안 #15047

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
15047	2015-07-11T07:26:20 Z	hongjun7	씽크스몰 (kriii3_TT)	C++	컴파일 오류	0 ms	0 KB

tt

#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;
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] = long long(fa[i].real() + (fa[i].real()>0 ? 0.5 : -0.5));
	long long r = res[0];
	for (int i = 1; i < n; i++) {
		long long x = res[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 <long long> 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);
}

Compilation message

tt.cpp: In function ‘void multiply(const std::vector<int>&, const std::vector<int>&, std::vector<long long int>&)’:
tt.cpp:45:39: error: expected primary-expression before ‘long’
  for (int i = 0; i < n; i++) res[i] = long long(fa[i].real() + (fa[i].real()>0 ? 0.5 : -0.5));
                                       ^
tt.cpp:48:13: warning: unused variable ‘x’ [-Wunused-variable]
   long long x = res[i];
             ^
tt.cpp: In function ‘int main()’:
tt.cpp:55:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
                       ^
tt.cpp:58:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for (int i = 0; i <= n; i++) scanf("%d", &a[i]);
                                                 ^
tt.cpp:59:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for (int i = 0; i <= m; i++) scanf("%d", &b[i]);
                                                 ^