Submission #31412

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
31412	2017-08-21 15:26:58	gs14004	카드 (kriii4_Z)	C++14	13 / 100	1000 ms	2656 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> &v, bool inv){
    int n = v.size();
    vector<base> w(n/2), aux(n);
    for(int i=0; i<n/2; i++){
      int k = i&-i;
      if(i == k){
        double ang = 2 * M_PI * i / n;
        if(inv) ang *= -1;
        w[i] = base(cos(ang), sin(ang));
      }
      else w[i] = w[i-k] * w[k];
    }
    for(int i=n/2; i; i>>=1){
      aux = v;
      for(int k=0; 2*k<n; k+=i){
        for(int j=0; j<i; j++){
          base a = aux[2*k + j], b = aux[2*k + j + i] * w[k];
          v[k + j] = a + b;
          v[k + j + n/2] = a - b;
        }
      }
 
 
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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:41:11: 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>&, int)':
Z.cpp:64:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(n < max(v.size(), w.size())) n <<= 1;
           ^
Z.cpp:67:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0; i<v.size(); i++){
                 ^
Z.cpp:71:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0; i<w.size(); i++){
                 ^

• Subtask 1: 13 / 13
• Subtask 2: 0 / 87