結果
| 問題 |
No.1289 RNG and OR
|
| コンテスト | |
| ユーザー |
fastmath
|
| 提出日時 | 2020-11-13 22:34:35 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 148 ms / 2,000 ms |
| コード長 | 3,388 bytes |
| コンパイル時間 | 3,547 ms |
| コンパイル使用メモリ | 198,208 KB |
| 最終ジャッジ日時 | 2025-01-15 23:36:46 |
|
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 21 |
ソースコード
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcountll
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC
#define debug(x) std::cout << #x << ": " << x << '\n';
const int MOD = 998'244'353;
//need define int long long
int mod(int n) {
n %= MOD;
if (n < 0) return n + MOD;
else return n;
}
int fp(int a, int p) {
int ans = 1, c = a;
for (int i = 0; (1ll << i) <= p; ++i) {
if ((p >> i) & 1) ans = mod(ans * c);
c = mod(c * c);
}
return ans;
}
int dv(int a, int b) { return mod(a * fp(b, MOD - 2)); }
struct M {
ll x;
M (int x_) {
x = mod(x_);
}
M () {
x = 0;
}
M operator + (M y) {
int ans = x + y.x;
if (ans >= MOD)
ans -= MOD;
return M(ans);
}
M operator - (M y) {
int ans = x - y.x;
if (ans < 0)
ans += MOD;
return M(ans);
}
M operator * (M y) {
return M(x * y.x % MOD);
}
M operator / (M y) {
return M(x * fp(y.x, MOD - 2) % MOD);
}
M operator + (int y) {
return (*this) + M(y);
}
M operator - (int y) {
return (*this) - M(y);
}
M operator * (int y) {
return (*this) * M(y);
}
M operator / (int y) {
return (*this) / M(y);
}
M operator ^ (int p) {
return M(fp(x, p));
}
void operator += (M y) {
*this = *this + y;
}
void operator -= (M y) {
*this = *this - y;
}
void operator *= (M y) {
*this = *this * y;
}
void operator /= (M y) {
*this = *this / y;
}
void operator += (int y) {
*this = *this + y;
}
void operator -= (int y) {
*this = *this - y;
}
void operator *= (int y) {
*this = *this * y;
}
void operator /= (int y) {
*this = *this / y;
}
void operator ^= (int p) {
*this = *this ^ p;
}
};
const int N = 18;
M p[1 << N];
M sub[1 << N];
signed main() {
#ifdef HOME
freopen("input.txt", "r", stdin);
#else
#define endl '\n'
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cout.setf(ios::fixed); cout.precision(20);
#endif
int n;
cin >> n;
vector <int> a(1 << n);
int s = 0;
for (int i = 0; i < (1 << n); ++i) {
cin >> a[i];
s += a[i];
}
for (int i = 0; i < (1 << n); ++i) {
p[i] = M(a[i])/s;
sub[i] = p[i];
}
for (int b = 0; b < n; ++b)
for (int i = 0; i < (1 << n); ++i)
if ((i>>b) & 1)
sub[i] += sub[i - (1<<b)];
auto f = [&] (int mask) {
int oth = (1 << n) - 1 - mask;
return sub[oth];
};
auto sum = [&] (M a) {
assert(a.x != 1);
return a / (M(1) - a);
};
/*
for (int i = 1; i <= 100; ++i) {
for (int j = 1; j <= 100; ++j) {
M t = M(i)/M(j);
if (t.x == 333333338) {
cout << i << ' ' << j << endl;
exit(0);
}
}
}
*/
M ans(0);
for (int mask = 1; mask < (1 << n); ++mask) {
//cout << mask << ' ' << f(mask).x << ' ' << sum(f(mask)).x << endl;
if (bp(mask)&1) {
ans += sum(f(mask));
}
else {
ans -= sum(f(mask));
}
}
cout << (ans+1).x << endl;
}
fastmath