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#1153. 【2.15省选联考(广东实验)T2】字符串

https://sjzezoj.com/submission/70349
This commit is contained in:
Baoshuo Ren 2023-02-16 06:37:58 +08:00
parent aefbcc67da
commit f46a4d3797
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
22 changed files with 197 additions and 0 deletions

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#include <iostream>
#include <algorithm>
#include <queue>
#include <string>
using std::cin;
using std::cout;
const char endl = '\n';
const int mod = 998244353;
int n, m, f[505][2005][(1 << 6) + 5], ans;
int root, cnt;
struct node {
int state, state2;
int child[2], fail;
node()
: state(0), fail(0) {
std::fill(std::begin(child), std::end(child), 0);
}
} tr[1005];
bool check(std::string s, int x) {
if (x + 1 < s.size() - x - 1) return false;
int i = x, j = x + 1;
while (0 <= i && j < s.size()) {
if (s[i] == s[j]) return false;
i--, j++;
}
return true;
}
void insert(std::string s, const int& id) {
int cur = root;
for (int i = 0; i < s.size(); i++) {
if (!tr[cur].child[s[i] - '0']) {
tr[cur].child[s[i] - '0'] = ++cnt;
}
cur = tr[cur].child[s[i] - '0'];
if (check(s, i)) {
tr[cur].state2 |= 1 << id;
}
}
tr[cur].state |= 1 << id;
}
void build() {
std::queue<int> q;
for (int i = 0; i < 2; i++) {
if (tr[root].child[i]) {
q.emplace(tr[root].child[i]);
}
}
while (!q.empty()) {
int cur = q.front();
q.pop();
for (int i = 0; i < 2; i++) {
if (tr[cur].child[i]) {
tr[tr[cur].child[i]].fail = tr[tr[cur].fail].child[i];
q.emplace(tr[cur].child[i]);
tr[tr[cur].child[i]].state |= tr[tr[tr[cur].child[i]].fail].state;
tr[tr[cur].child[i]].state2 |= tr[tr[tr[cur].child[i]].fail].state2;
} else {
tr[cur].child[i] = tr[tr[cur].fail].child[i];
}
}
}
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
for (int i = 0; i < n; i++) {
std::string s;
cin >> s;
insert(s, i);
std::reverse(s.begin(), s.end());
std::transform(s.begin(), s.end(), s.begin(), [&](char c) -> char {
return c == '0' ? '1' : '0';
});
insert(s, i);
}
build();
f[0][0][0] = 1;
for (int i = 1; i <= m; i++) {
for (int j = 0; j <= cnt; j++) {
for (int s = 0; s < 1 << n; s++) {
if (!f[i - 1][j][s]) continue;
for (int k = 0; k < 2; k++) {
int cur = tr[j].child[k],
ns = s | tr[cur].state;
f[i][cur][ns] = (f[i][cur][ns] + f[i - 1][j][s]) % mod;
}
}
}
}
int ans = 0;
for (int i = 0; i <= cnt; i++) {
for (int s = 0; s < 1 << n; s++) {
if ((s | tr[i].state2) == (1 << n) - 1) {
ans = (ans + f[m][i][s]) % mod;
}
}
}
cout << ans << endl;
return 0;
}

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