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#1745. 【2022.11.8 NOIP 模拟赛】石蒜反冲(lycoris)

https://sjzezoj.com/submission/63909
This commit is contained in:
Baoshuo Ren 2022-11-08 10:25:44 +08:00
parent 0a6f04d059
commit e689335869
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
38 changed files with 179 additions and 0 deletions

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#include <iostream>
#include <algorithm>
#include <string>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 10005,
K = 2005;
const int mod = 993244353;
const std::string s1 = "sakana";
const std::string s2 = "chinanago";
int n, k, _f[N][K], *f[N];
std::string s;
bool check(const std::string &pat, const std::string &str) {
if (pat.size() != str.size()) return false;
for (int i = 0; i < pat.size(); i++) {
if (pat[i] != '?' && pat[i] != str[i]) return false;
}
return true;
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> s;
k = n / std::max(s1.size(), s2.size());
s = ' ' + s;
for (int i = 0; i <= n; i++) {
f[i] = _f[i] + k + 1;
}
f[0][0] = 1;
for (int i = 1; i <= n; i++) {
for (int j = -k; j <= k; j++) {
if (s[i] == '?') f[i][j] = (f[i][j] + static_cast<long long>(f[i - 1][j]) * 26 % mod) % mod;
else f[i][j] = f[i - 1][j];
}
if (i >= s1.size() && check(s.substr(i - s1.size() + 1, s1.size()), s1)) {
for (int j = -k; j <= k; j++) {
f[i][j] = ((f[i][j] - f[i - s1.size()][j]) % mod + mod) % mod;
f[i][j + 1] = (f[i][j + 1] + f[i - s1.size()][j]) % mod;
}
}
if (i >= s2.size() && check(s.substr(i - s2.size() + 1, s2.size()), s2)) {
for (int j = -k; j <= k; j++) {
f[i][j] = ((f[i][j] - f[i - s2.size()][j]) % mod + mod) % mod;
f[i][j - 1] = (f[i][j - 1] + f[i - s2.size()][j]) % mod;
}
}
}
cout << f[n][0] << endl;
return 0;
}

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