結果
| 問題 | No.1239 Multiplication -2 |
| コンテスト | |
| ユーザー |
suta28407928
|
| 提出日時 | 2020-09-26 01:52:41 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.89.0) |
| 結果 |
AC
|
| 実行時間 | 88 ms / 2,000 ms |
| コード長 | 4,476 bytes |
| 記録 | |
| コンパイル時間 | 1,039 ms |
| コンパイル使用メモリ | 106,936 KB |
| 実行使用メモリ | 9,600 KB |
| 最終ジャッジ日時 | 2024-06-28 10:08:06 |
| 合計ジャッジ時間 | 3,443 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 34 |
ソースコード
#include <iostream>
#include <string>
#include <cstdlib>
#include <cmath>
#include <vector>
#include <unordered_map>
#include <map>
#include <set>
#include <algorithm>
#include <queue>
#include <stack>
#include <functional>
#include <bitset>
#include <assert.h>
#include <unordered_map>
#include <fstream>
#include <ctime>
#include <complex>
using namespace std;
typedef long long ll;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<char> vc;
typedef vector<string> vs;
typedef vector<bool> vb;
typedef vector<double> vd;
typedef pair<ll,ll> P;
typedef pair<int,int> pii;
typedef vector<P> vpl;
typedef tuple<ll,ll,ll> tapu;
#define rep(i,n) for(int i=0; i<(n); i++)
#define REP(i,a,b) for(int i=(a); i<(b); i++)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
const int inf = 1<<30;
const ll linf = 1LL<<62;
const int MAX = 2020000;
ll dy[8] = {1,-1,0,0,1,-1,1,-1};
ll dx[8] = {0,0,1,-1,1,-1,-1,1};
const double pi = acos(-1);
const double eps = 1e-7;
template<typename T1,typename T2> inline bool chmin(T1 &a,T2 b){
if(a>b){
a = b; return true;
}
else return false;
}
template<typename T1,typename T2> inline bool chmax(T1 &a,T2 b){
if(a<b){
a = b; return true;
}
else return false;
}
template<typename T> inline void print(T &a){
for(auto itr = a.begin(); itr != a.end(); itr++){
cout << *itr << " ";
}
cout << "\n";
}
template<typename T1,typename T2> inline void print2(T1 a, T2 b){
cout << "debug: " << a << " " << b << "\n";
}
template<typename T1,typename T2,typename T3> inline void print3(T1 a, T2 b, T3 c){
cout << "debug: " << a << " " << b << " " << c << "\n";
}
void mark() {cout << "#" << "\n";}
ll pcount(ll x) {return __builtin_popcountll(x);}
//const int mod = 1e9 + 7;
const int mod = 998244353;
template <std::uint_fast64_t Modulus> class modint {
using u64 = std::uint_fast64_t;
public:
u64 a;
constexpr modint(const u64 x = 0) noexcept : a(x % Modulus) {}
constexpr u64 &value() noexcept { return a; }
constexpr const u64 &value() const noexcept { return a; }
constexpr modint operator+(const modint rhs) const noexcept {
return modint(*this) += rhs;
}
constexpr modint operator-(const modint rhs) const noexcept {
return modint(*this) -= rhs;
}
constexpr modint operator*(const modint rhs) const noexcept {
return modint(*this) *= rhs;
}
constexpr modint operator/(const modint rhs) const noexcept {
return modint(*this) /= rhs;
}
constexpr modint &operator+=(const modint rhs) noexcept {
a += rhs.a;
if (a >= Modulus) {
a -= Modulus;
}
return *this;
}
constexpr modint &operator-=(const modint rhs) noexcept {
if (a < rhs.a) {
a += Modulus;
}
a -= rhs.a;
return *this;
}
constexpr modint &operator*=(const modint rhs) noexcept {
a = a * rhs.a % Modulus;
return *this;
}
constexpr modint &operator/=(modint rhs) noexcept {
u64 exp = Modulus - 2;
while (exp) {
if (exp % 2) {
*this *= rhs;
}
rhs *= rhs;
exp /= 2;
}
return *this;
}
};
using mint = modint<mod>;
ll modpow(ll x, ll n, ll mod){
ll res = 1;
while(n > 0){
if(n & 1) res = res * x % mod;
x = x * x % mod;
n >>= 1;
}
return res;
}
template<typename T> struct BIT{
vector<T> dat;
ll sz;
//all 1-indexed
BIT(ll sz) : sz(sz){
dat.assign(++sz, 0);
}
T sum(ll k){
T ret = 0;
for(++k; k > 0; k -= k & -k) ret += dat[k];
return (ret);
}
void add(ll k, T x){
for(++k; k < dat.size(); k += k & -k) dat[k] += x;
}
ll get(T k){
if(k <= 0) return 0;
ll ret = 0;
int n = 1; while(n < sz) n *= 2;
for(int i=n/2; i>0; i/=2){
if(ret+i < sz && dat[ret+i] < k){
k -= dat[ret+i];
ret += i;
}
}
return ret;
}
};
int main(){
int n; cin >> n;
vl a(n); rep(i,n) cin >> a[i];
vl nxt(n,n);
for(int i=n-1; i>=1; i--){
nxt[i-1] = nxt[i];
if(abs(a[i]) == 2 || a[i] == 0) nxt[i-1] = i;
}
mint p = 0, q = modpow(2,n-1,mod);
BIT<mint> m(n), M(n);
bool plus = true;
rep(i,n){
if(a[i] < 0) plus = !plus;
if(a[i] == 0) continue;
if(plus) M.add(i,modpow(2,n-i-2,mod));
else m.add(i,modpow(2,n-i-2,mod));
}
plus = true;
rep(i,n){
if(a[i] == 0) continue;
int l,r;
if(abs(a[i]) == 2){
l = i;
r = nxt[i];
}else{
l = nxt[i];
r = nxt[l];
}
if(l == n) break;
if(a[l] != 0){
if(plus) p += (m.sum(r-1) - m.sum(l-1)) * modpow(2,i-1,mod);
else p += (M.sum(r-1) - M.sum(l-1)) * modpow(2,i-1,mod);
}
if(a[i] < 0) plus = !plus;
}
cout << (p / q).value() << "\n";
}
suta28407928