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ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#608146 | #6614. Cards of Magic | ucup-team3519 | AC ✓ | 125ms | 5584kb | C++20 | 3.4kb | 2024-10-03 19:05:50 | 2024-10-03 19:05:50 |
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answer
#include <bits/stdc++.h>
template <int m>
struct ModInt {
private:
int raw_;
using mint = ModInt;
using i64 = int64_t;
public:
ModInt() {
raw_ = 0;
}
template <typename T>
ModInt(const T &v) {
raw_ = v % m;
}
int value() const {
return (raw_ + m) % m;
}
mint &operator+=(const mint &rhs) {
raw_ = (raw_ + rhs.raw_) % m;
return *this;
}
mint &operator-=(const mint &rhs) {
raw_ = (raw_ - rhs.raw_) % m;
return *this;
}
mint &operator*=(const mint &rhs) {
raw_ = (i64)raw_ * rhs.raw_ % m;
return *this;
}
mint &operator/=(const mint &rhs) {
return (*this) *= qpow(rhs, m - 2);
}
friend mint operator+(const mint &lhs, const mint &rhs) {
return mint(lhs) += rhs;
}
friend mint operator-(const mint &lhs, const mint &rhs) {
return mint(lhs) -= rhs;
}
friend mint operator*(const mint &lhs, const mint &rhs) {
return mint(lhs) *= rhs;
}
friend mint operator/(const mint &lhs, const mint &rhs) {
return mint(lhs) /= rhs;
}
static constexpr int mod() {
return m;
}
static mint qpow(mint a, i64 b) {
mint res = 1;
while (b) {
if (b & 1) {
res *= a;
}
a *= a, b >>= 1;
}
return res;
}
};
using mint = ModInt<998244353>;
using namespace std;
using ll=long long;
vector<mint>fact,ifact;
void init(int n){
fact.resize(n+4);
ifact.resize(n+4);
fact[0]=ifact[0]=1;
for(int i=1;i<=n+3;i++){
fact[i]=fact[i-1]*i;
ifact[i]=1/fact[i];
}
}
mint C(int n,int m){
if(n<0||n-m<0||m<0)return 0;
return fact[n]*ifact[n-m]*ifact[m];
}
mint C_inc(mint pre,int l,int r,int k){
return 2*pre+C(k,l-1)-C(k,r);
}
void solve(){
int n;
cin>>n;
init(n);
vector<mint>p(n+3);
mint f23=mint(2)/3;
mint f13=mint(1)/3;
for(int k=1;k<=n+1;k++){
p[k]+=1-mint::qpow(f23,k)*2-k*mint::qpow(f13,k)*mint::qpow(2,k-1)+mint::qpow(f13,k)*(k+1);
// cout<<p[k].value();
if(k-1>=n)
p[k]+=mint::qpow(f13,k);
if(k>=n&&k>=2)
p[k]+=mint::qpow(f13,k)*k;
if(2*k>=n)
p[k]+=mint::qpow(f23,k)-mint::qpow(f13,k);
}
int l=1,r=0;
mint pre=0;
for(int k=2;k<=n+1;k++){
int cl=1,cr=min((3*k-1-n)/2,k-1);
if(cl>cr)continue;
while(r<cr){
r++;
pre+=C(k,r);
}
p[k]+=pre*mint::qpow(f13,k);
pre=C_inc(pre,l,r,k);
}
l=1,r=0,pre=0;
for(int k=3;k<=n+1;k++){
int cl=1,cr=min((3*k-n)/2,k-2);
if(cl>cr)continue;
while(r<cr){
r++;
pre+=C(k-1,r);
}
p[k]+=pre*mint::qpow(f13,k)*k;
pre=C_inc(pre,l,r,k-1);
}
p[n+2]=1-mint::qpow(f13,n+2);
mint ans=0;
for(int i=1;i<=n+2;i++){
ans+=(p[i]-p[i-1])*i;
}
// for(int i=0;i<=n+2;i++){
// // assert(p[i]==()
// cout<<p[i].value()<<' ';
// }
// cout<<'\n';
// cout<<(mint(8)/9).value();
ans+=mint::qpow(f13,n+2)*(n+mint(7)/2);
cout<<ans.value();
}
int main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
solve();
}
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ok 1 number(s): "762776485"
Test #105:
score: 0
Accepted
time: 84ms
memory: 4644kb
input:
136901
output:
837991108
result:
ok 1 number(s): "837991108"
Test #106:
score: 0
Accepted
time: 122ms
memory: 5520kb
input:
194613
output:
384410784
result:
ok 1 number(s): "384410784"
Test #107:
score: 0
Accepted
time: 118ms
memory: 5476kb
input:
194632
output:
838353104
result:
ok 1 number(s): "838353104"
Test #108:
score: 0
Accepted
time: 107ms
memory: 5164kb
input:
177132
output:
420003183
result:
ok 1 number(s): "420003183"
Test #109:
score: 0
Accepted
time: 118ms
memory: 5584kb
input:
189159
output:
192759818
result:
ok 1 number(s): "192759818"
Test #110:
score: 0
Accepted
time: 120ms
memory: 5428kb
input:
192552
output:
377372327
result:
ok 1 number(s): "377372327"
Test #111:
score: 0
Accepted
time: 113ms
memory: 5160kb
input:
181566
output:
991185836
result:
ok 1 number(s): "991185836"
Test #112:
score: 0
Accepted
time: 125ms
memory: 5420kb
input:
199679
output:
477499113
result:
ok 1 number(s): "477499113"
Test #113:
score: 0
Accepted
time: 125ms
memory: 5508kb
input:
199352
output:
823328344
result:
ok 1 number(s): "823328344"
Test #114:
score: 0
Accepted
time: 125ms
memory: 5440kb
input:
199408
output:
924981866
result:
ok 1 number(s): "924981866"
Test #115:
score: 0
Accepted
time: 125ms
memory: 5584kb
input:
198741
output:
554240349
result:
ok 1 number(s): "554240349"
Test #116:
score: 0
Accepted
time: 121ms
memory: 5488kb
input:
199995
output:
401387038
result:
ok 1 number(s): "401387038"