結果
| 問題 |
No.1240 Or Sum of Xor Pair
|
| コンテスト | |
| ユーザー |
rniya
|
| 提出日時 | 2020-12-02 21:44:43 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 644 ms / 2,000 ms |
| コード長 | 3,574 bytes |
| コンパイル時間 | 2,550 ms |
| コンパイル使用メモリ | 198,380 KB |
| 最終ジャッジ日時 | 2025-01-16 13:34:57 |
|
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 30 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
#define LOCAL
#pragma region Macros
typedef long long ll;
#define ALL(x) (x).begin(),(x).end()
const long long MOD=1000000007;
// const long long MOD=998244353;
const int INF=1e9;
const long long IINF=1e18;
const int dx[4]={1,0,-1,0},dy[4]={0,1,0,-1};
const char dir[4]={'D','R','U','L'};
template<typename T>
istream &operator>>(istream &is,vector<T> &v){
for (T &x:v) is >> x;
return is;
}
template<typename T>
ostream &operator<<(ostream &os,const vector<T> &v){
for (int i=0;i<v.size();++i){
os << v[i] << (i+1==v.size()?"": " ");
}
return os;
}
template<typename T,typename U>
ostream &operator<<(ostream &os,const pair<T,U> &p){
os << '(' << p.first << ',' << p.second << ')';
return os;
}
template<typename T,typename U>
ostream &operator<<(ostream &os,const map<T,U> &m){
os << '{';
for (auto itr=m.begin();itr!=m.end();++itr){
os << '(' << itr->first << ',' << itr->second << ')';
if (++itr!=m.end()) os << ',';
--itr;
}
os << '}';
return os;
}
template<typename T>
ostream &operator<<(ostream &os,const set<T> &s){
os << '{';
for (auto itr=s.begin();itr!=s.end();++itr){
os << *itr;
if (++itr!=s.end()) os << ',';
--itr;
}
os << '}';
return os;
}
void debug_out(){cerr << '\n';}
template<class Head,class... Tail>
void debug_out(Head&& head,Tail&&... tail){
cerr << head;
if (sizeof...(Tail)>0) cerr << ", ";
debug_out(move(tail)...);
}
#ifdef LOCAL
#define debug(...) cerr << " ";\
cerr << #__VA_ARGS__ << " :[" << __LINE__ << ":" << __FUNCTION__ << "]" << '\n';\
cerr << " ";\
debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif
template<typename T> T gcd(T x,T y){return y!=0?gcd(y,x%y):x;}
template<typename T> T lcm(T x,T y){return x/gcd(x,y)*y;}
template<class T1,class T2> inline bool chmin(T1 &a,T2 b){
if (a>b){a=b; return true;} return false;
}
template<class T1,class T2> inline bool chmax(T1 &a,T2 b){
if (a<b){a=b; return true;} return false;
}
#pragma endregion
template<typename T>
void fwt(vector<T> &f){
int n=f.size();
for (int i=1;i<n;i<<=1){
for (int j=0;j<n;++j){
if (!(j&i)){
T x=f[j],y=f[j|i];
f[j]=x+y; f[j|i]=x-y;
}
}
}
}
template<typename T>
void ifwt(vector<T> &f){
int n=f.size();
for (int i=1;i<n;i<<=1){
for (int j=0;j<n;++j){
if (!(j&i)){
T x=f[j],y=f[j|i];
f[j]=(x+y)/2; f[j|i]=(x-y)/2;
}
}
}
}
template<typename T>
vector<T> xor_convolution(vector<T> A,vector<T> B){
int n=A.size();
assert(__builtin_popcount(n)==1);
assert(A.size()==B.size());
fwt(A); fwt(B);
for (int i=0;i<n;++i) A[i]*=B[i];
ifwt(A);
return A;
}
const int MAX_B=18;
int main(){
cin.tie(0);
ios::sync_with_stdio(false);
int N,X; cin >> N >> X;
vector<int> A(N);
for (int i=0;i<N;++i) cin >> A[i];
long long ans=0;
vector<long long> cnt(1<<MAX_B,0);
for (int i=0;i<N;++i) ++cnt[A[i]];
vector<long long> conv=xor_convolution(cnt,cnt);
for (int i=0;i<X;++i) ans+=conv[i]*i;
for (int j=0,mask=1;j<MAX_B;++j,mask<<=1){
fill(cnt.begin(),cnt.end(),0);
for (int i=0;i<N;++i){
if (A[i]&mask){
++cnt[A[i]];
ans-=mask;
}
}
conv=xor_convolution(cnt,cnt);
for (int i=0;i<X;++i) ans+=conv[i]*mask;
}
cout << ans/2 << '\n';
}
rniya