結果

問題 No.2279 OR Insertion
ユーザー t98slider
提出日時 2023-04-21 22:57:21
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 83 ms / 2,000 ms
コード長 3,905 bytes
コンパイル時間 1,661 ms
コンパイル使用メモリ 170,480 KB
実行使用メモリ 6,824 KB
最終ジャッジ日時 2024-11-06 16:24:09
合計ジャッジ時間 4,867 ms
ジャッジサーバーID
(参考情報)
judge3 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2
other AC * 48
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;
using ll = long long;
template<const unsigned int MOD> struct prime_modint {
using mint = prime_modint;
unsigned int v;
prime_modint() : v(0) {}
prime_modint(unsigned int a) { a %= MOD; v = a; }
prime_modint(unsigned long long a) { a %= MOD; v = a; }
prime_modint(int a) { a %= (int)(MOD); if(a < 0)a += MOD; v = a; }
prime_modint(long long a) { a %= (int)(MOD); if(a < 0)a += MOD; v = a; }
static constexpr int mod() { return MOD; }
mint& operator++() {v++; if(v == MOD)v = 0; return *this;}
mint& operator--() {if(v == 0)v = MOD; v--; return *this;}
mint operator++(int) { mint result = *this; ++*this; return result; }
mint operator--(int) { mint result = *this; --*this; return result; }
mint& operator+=(const mint& rhs) { v += rhs.v; if(v >= MOD) v -= MOD; return *this; }
mint& operator-=(const mint& rhs) { if(v < rhs.v) v += MOD; v -= rhs.v; return *this; }
mint& operator*=(const mint& rhs) {
v = (unsigned int)((unsigned long long)(v) * rhs.v % MOD);
return *this;
}
mint& operator/=(const mint& rhs) { return *this = *this * rhs.inv(); }
mint operator+() const { return *this; }
mint operator-() const { return mint() - *this; }
mint pow(long long n) const {
assert(0 <= n);
mint r = 1, x = *this;
while (n) {
if (n & 1) r *= x;
x *= x;
n >>= 1;
}
return r;
}
mint inv() const { assert(v); return pow(MOD - 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; }
friend bool operator==(const mint& lhs, const mint& rhs) { return (lhs.v == rhs.v); }
friend bool operator!=(const mint& lhs, const mint& rhs) { return (lhs.v != rhs.v); }
friend std::ostream& operator << (std::ostream &os, const mint& rhs) noexcept { return os << rhs.v; }
};
//using mint = prime_modint<1000000007>;
using mint = prime_modint<998244353>;
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
int n;
string s;
cin >> n >> s;
mint ans, d = 1;
for(int i = 1; i <= n; i++){
vector<array<mint,2>> dp(n + 2, {0, 0});
vector<mint> cum0(n + 2);
mint s0 = 1, s1;
dp[0][0] = 1;
cum0[1] = 1;
/*for(int j = 0; j < n; j++){
for(int k = j + 1; k <= n; k++){
dp[k][(k >= i && k - i >= j && s[k - i] == '1')] += dp[j][0];
dp[k][1] += dp[j][1];
}
}*/
/*for(int j = 0; j < n; j++){
dp[j + 1][0] += 2 * dp[j][0];
dp[j + 1][1] += 2 * dp[j][1];
if(j + i <= n && s[j] == '1'){
dp[j + i][0] -= dp[j][0];
dp[j + i + 1][0] += dp[j][0];
dp[j + i][1] += dp[j][0];
dp[j + i + 1][1] -= dp[j][0];
}
}*/
for(int j = 1; j <= n; j++){
if(j >= i && s[j - i] == '1'){
dp[j][0] = s0 - cum0[j - i + 1];
dp[j][1] = cum0[j - i + 1] + s1;
}else{
dp[j][0] = s0;
dp[j][1] = s1;
}
cum0[j + 1] = cum0[j] + dp[j][0];
s0 += dp[j][0], s1 += dp[j][1];
}
//cerr << dp[0][0] << " " << dp[0][1] << '\n';
//cerr << dp[1][0] << " " << dp[1][1] << '\n';
//cerr << dp[2][0] << " " << dp[2][1] << '\n';
//cerr << dp[3][0] << " " << dp[3][1] << '\n';
//cerr << dp[n][0] << " " << dp[n][1] << '\n';
ans += d * dp[n][1];
d += d;
}
cout << ans << '\n';
}
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