Submission #31419

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
31419	2017-08-22 06:07:15	gs14004	카드 (kriii4_Z)	C++14	100 / 100	549 ms	3276 KiB

Z

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#include <bits/stdc++.h>
using namespace std;
typedef long long lint;
typedef pair<int, int> pi;
const int MAXN = 3005;
const int mod = 1e9 + 7;
namespace fft{
  typedef complex<double> base;
  void fft(vector<base> &a, bool inv){
    int n = a.size(), j = 0;
    for(int i=1; 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 i=2; i<=n; i<<=1){
      double ang = 2 * acos(-1) / i * (inv ? -1 : 1);
      base x(cos(ang), sin(ang));
      for(int j=0; j<n; j+=i){
        base y(1);
        for(int k=0; k<i/2; k++){
          base u = a[j+k], v = a[j+k+i/2] * y;
          a[j+k] = u+v;
          a[j+k+i/2] = u-v;
          y *= x;
 
 
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Compilation message (stderr)

Z.cpp: In function 'std::vector<long long int> fft::multiply(std::vector<long long int>&, std::vector<long long int>&)':
Z.cpp:40:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(n < max(v.size(), w.size())) n <<= 1;
           ^
Z.cpp: In function 'std::vector<long long int> fft::multiply(std::vector<long long int>&, std::vector<long long int>&, lint)':
Z.cpp:54:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(n < max(v.size(), w.size())) n <<= 1;
           ^
Z.cpp:58:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0; i<v.size(); i++){
                 ^
Z.cpp:61:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0; i<w.size(); i++){
                 ^

• Subtask 1: 13 / 13
• Subtask 2: 87 / 87