結果

問題 No.1193 Penguin Sequence
ユーザー saksak
提出日時 2021-01-06 03:33:43
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
WA  
実行時間 -
コード長 3,116 bytes
コンパイル時間 2,535 ms
コンパイル使用メモリ 216,124 KB
実行使用メモリ 29,516 KB
最終ジャッジ日時 2024-11-06 11:12:11
合計ジャッジ時間 21,753 ms
ジャッジサーバーID
(参考情報)
judge4 / judge3
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 WA -
testcase_01 WA -
testcase_02 WA -
testcase_03 WA -
testcase_04 WA -
testcase_05 WA -
testcase_06 WA -
testcase_07 WA -
testcase_08 WA -
testcase_09 WA -
testcase_10 WA -
testcase_11 AC 360 ms
21,284 KB
testcase_12 AC 365 ms
21,368 KB
testcase_13 WA -
testcase_14 WA -
testcase_15 WA -
testcase_16 AC 416 ms
16,768 KB
testcase_17 AC 11 ms
11,060 KB
testcase_18 AC 53 ms
12,540 KB
testcase_19 WA -
testcase_20 WA -
testcase_21 AC 408 ms
19,936 KB
testcase_22 AC 65 ms
13,092 KB
testcase_23 AC 322 ms
20,528 KB
testcase_24 AC 271 ms
17,572 KB
testcase_25 AC 123 ms
15,216 KB
testcase_26 AC 37 ms
12,324 KB
testcase_27 WA -
testcase_28 AC 377 ms
19,396 KB
testcase_29 WA -
testcase_30 AC 179 ms
16,504 KB
testcase_31 AC 146 ms
15,824 KB
testcase_32 AC 437 ms
24,756 KB
testcase_33 AC 296 ms
17,876 KB
testcase_34 AC 240 ms
18,644 KB
testcase_35 AC 295 ms
19,964 KB
testcase_36 AC 235 ms
18,512 KB
testcase_37 WA -
testcase_38 AC 11 ms
10,968 KB
testcase_39 AC 12 ms
11,212 KB
testcase_40 AC 12 ms
11,132 KB
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> p_ll;
template<class T>
void debug(T itr1, T itr2) { auto now = itr1; while(now<itr2) { cout << *now << " "; now++; } cout << endl; }
#define repr(i,from,to) for (ll i=(ll)from; i<(ll)to; i++)
#define all(vec) vec.begin(), vec.end()
#define rep(i,N) repr(i,0,N)
#define per(i,N) for (int i=(int)N-1; i>=0; i--)
const ll MOD = 998244353;
const ll LLINF = pow(2,61)-1;
const int INF = pow(2,30)-1;
vector<ll> fac;
void c_fac(int x=pow(10,6)+10) { fac.resize(x,true); rep(i,x) fac[i] = i ? (fac[i-1]*i)%MOD : 1; }
ll modpow(ll x, ll p) { ll result = 1, now = 1, pm = x; while (now<=p) { if (p&now) { result = result * pm % MOD; } now*=2; pm = pm*pm % MOD; } return
    result; }
ll inv(ll a, ll m=MOD) { ll b = m, x = 1, y = 0; while (b!=0) { int d = a/b; a -= b*d; swap(a,b); x -= y*d; swap(x,y); } return (x+m)%m; }
ll nck(ll n, ll k) { return k<0||k>n ? 0 : fac[n]*inv(fac[k]*fac[n-k]%MOD)%MOD; }
ll gcd(ll a, ll b) { if (a<b) swap(a,b); return b==0 ? a : gcd(b, a%b); }
ll lcm(ll a, ll b) { return a/gcd(a,b)*b; }
// ----------------------------------------------------------------------
// ----------------------------------------------------------------------
struct SegTree {
ll size;
vector<ll> pos;
SegTree(ll N) { size = 1; while(size<N) size<<=1; pos.resize(2*size,0); }
ll operator[](const ll &x) const { return pos[x+size]; }
void set(ll x, const ll v) { pos[x+size] = v; }
void update(ll x, const ll v) { set(x,v); x+=size; while (x>>=1) operate(x); }
ll query(ll a, ll b) {
ll L = 0, R = 0;
for (a+=size, b+=size; a<b; a>>=1, b>>=1) {
if (a&1) { L = q(L,pos[a]); a++; }
if (b&1) { b--; R = q(pos[b],R); }
}
return q(L,R);
}
void operate(ll i) { pos[i] = q(pos[i*2], pos[i*2+1]); }
ll q(ll x, ll y) { return x + y; }
};
// ----------------------------------------------------------------------
// ----------------------------------------------------------------------
vector<ll> zaatsu(vector<ll> &list) {
map<ll, ll> num; for (auto x: list) num[x]++;
ll p = 0; for (auto x: num) { num[x.first] = p; p++; }
vector<ll> result; for (auto x: list) result.push_back(num[x]);
return result;
}
// ----------------------------------------------------------------------
// ----------------------------------------------------------------------
int main() {
ll N; cin >> N;
vector<ll> A(N); rep(i,N) cin >> A[i];
A = zaatsu(A);
// debug(all(A));
SegTree st(N);
ll ten = 0; rep(i,N) { ten += st.query(A[i]+1,N); st.update(A[i],st[A[i]]+1); }
ll later = 0; rep(i,N) later = (later+st[i]*st.query(i+1,N)) % MOD;
// cout << ten << " " << later << endl;
c_fac();
ll allc = 1; rep(i,N) allc = allc * nck(N,i+1) % MOD;
ll invn2 = modpow(inv(N),2);
ll res1 = 0, res2 = 0;
rep(i,N) {
ll c1 = i+1, c2 = (i+2+N)*(N-(i+1))/2;
res1 = (res1+allc*invn2%MOD*c1%MOD*c2%MOD*later%MOD) % MOD;
res2 = (res2+allc*inv(nck(N,i+1))%MOD*nck(N-2,i-1)%MOD*ten%MOD) % MOD;
}
ll result = (res1+res2) % MOD;
cout << result << endl;
return 0;
}
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