Submission #639822

#	Time	Username	Problem	Language	Result	Execution time	Memory
639822		ggoh	씽크스몰 (kriii3_TT)	C++14	30 / 30	1510 ms	179540 KiB

tt

#include <bits/stdc++.h>
#define lint long long
using namespace std;
//source : https://github.com/koosaga/DeobureoMinkyuParty/blob/master/teamnote.pdf
//no ntt
typedef complex<double> base;
void fft(vector<base> &a, bool inv)
{
  int n = a.size(), j = 0;
  vector<base> roots(n / 2);
  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]);
  }
  double ang = 2 * acos(-1) / n * (inv ? -1 : 1);
  for (int i = 0; i < n / 2; i++)
  {
    roots[i] = base(cos(ang * i), sin(ang * i));
  }

  for (int i = 2; i <= n; i <<= 1)
  {
    int step = n / i;
    for (int j = 0; j < n; j += i)
    {
      for (int k = 0; k < i / 2; k++)
      {
        base u = a[j + k], v = a[j + k + i / 2] * roots[step * k];
        a[j + k] = u + v;
        a[j + k + i / 2] = u - v;
      }
    }
  }
  if (inv)
    for (int i = 0; i < n; i++)
      a[i] /= n;
}
vector<lint> multiply(vector<lint> &v, vector<lint> &w)
{
  int n = 2;
  while (n < v.size() + w.size())
    n <<= 1;
  vector<base> v1(n), v2(n), r1(n), r2(n);
  for (int i = 0; i < v.size(); i++)
  {
    v1[i] = base(v[i] >> 15, v[i] & 32767);
  }
  for (int i = 0; i < w.size(); i++)
  {
    v2[i] = base(w[i] >> 15, w[i] & 32767);
  }
  fft(v1, 0);
  fft(v2, 0);
  for (int i = 0; i < n; i++)
  {
    int j = (i ? (n - i) : i);
    base ans1 = (v1[i] + conj(v1[j])) * base(0.5, 0);
    base ans2 = (v1[i] - conj(v1[j])) * base(0, -0.5);
    base ans3 = (v2[i] + conj(v2[j])) * base(0.5, 0);
    base ans4 = (v2[i] - conj(v2[j])) * base(0, -0.5);
    r1[i] = (ans1 * ans3) + (ans1 * ans4) * base(0, 1);
    r2[i] = (ans2 * ans3) + (ans2 * ans4) * base(0, 1);
  }
  fft(r1, 1);
  fft(r2, 1);
  vector<lint> ret(n);
  for (int i = 0; i < n; i++)
  {
    lint av = (lint)round(r1[i].real());
    lint bv = (lint)round(r1[i].imag()) + (lint)round(r2[i].real());
    lint cv = (lint)round(r2[i].imag());
    ret[i] = (av << 30) + (bv << 15) + cv;
  }
  return ret;
}
int N, M, x;
vector<lint> f, g;
int main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cin>>N>>M;
  for (int i = 0; i <= N; i++)
  {
    cin>>x;
    f.push_back(x);
  }
  for (int i = 0; i <= M; i++)
  {
    cin>>x;
    g.push_back(x);
  }
  vector<lint> r = multiply(f, g);
  lint xo = 0;
  for (int i = 0; i < r.size(); i++)
    xo ^= r[i];
  cout<<xo;
}

Compilation message (stderr)

tt.cpp: In function 'std::vector<long long int> multiply(std::vector<long long int>&, std::vector<long long int>&)':
tt.cpp:49:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |   while (n < v.size() + w.size())
      |          ~~^~~~~~~~~~~~~~~~~~~~~
tt.cpp:52:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |   for (int i = 0; i < v.size(); i++)
      |                   ~~^~~~~~~~~~
tt.cpp:56:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |   for (int i = 0; i < w.size(); i++)
      |                   ~~^~~~~~~~~~
tt.cpp: In function 'int main()':
tt.cpp:104:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  104 |   for (int i = 0; i < r.size(); i++)
      |                   ~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10