結果

問題 No.1702 count good string
ユーザー sten_san
提出日時 2023-02-27 11:44:11
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 94 ms / 2,000 ms
コード長 3,547 bytes
コンパイル時間 1,705 ms
コンパイル使用メモリ 199,132 KB
最終ジャッジ日時 2025-02-10 23:54:30
ジャッジサーバーID
(参考情報)
judge2 / judge2
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 * 3
other AC * 47
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;
struct iofast_t {
iofast_t() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
}
} iofast;
struct uns_t {} uns;
template <typename Element, typename Head, typename ...Args>
auto vec(Element init, Head arg, Args ...args) {
if constexpr (sizeof...(Args) == 0) return vector(arg, init);
else return vector(arg, vec(init, args...));
}
template <typename Element, typename Head, typename ...Args>
auto vec(uns_t, Head arg, Args ...args) {
return vec(Element(), arg, args...);
}
template <typename Container>
auto distance(const Container &c, decltype(begin(c)) iter) {
return distance(begin(c), iter);
}
template <typename RIter, typename Compare = less<typename iterator_traits<RIter>::value_type>>
auto isort(RIter first, RIter last, Compare comp = Compare()) {
vector<int> i(distance(first, last));
iota(begin(i), end(i), 0);
sort(begin(i), end(i), [&](auto x, auto y) {
return comp(*(first + x), *(first + y));
});
return i;
}
template <typename, template <typename> typename, typename = void_t<>>
struct detect : false_type {};
template <typename T, template <typename> typename Check>
struct detect<T, Check, void_t<Check<T>>> : true_type {};
template <typename T, template <typename> typename Check>
constexpr inline bool detect_v = detect<T, Check>::value;
template <typename T>
using has_member_sort = decltype(declval<T>().sort());
template <typename Container, typename Compare = less<typename Container::value_type>>
auto sorted(Container c, Compare comp = Compare()) {
if constexpr (detect_v<Container, has_member_sort>) {
c.sort(comp);
return c;
}
else {
sort(begin(c), end(c), comp);
return c;
}
}
template <typename Container, typename Compare = equal_to<typename Container::value_type>>
auto uniqued(Container c, Compare comp = Compare()) {
c.erase(unique(begin(c), end(c), comp), end(c));
return c;
}
template <typename T, typename Compare = less<T>>
T &chmin(T &l, T r, Compare &&f = less<T>()) { return l = min(l, r, f); }
template <typename T, typename Compare = less<T>>
T &chmax(T &l, T r, Compare &&f = less<T>()) { return l = max(l, r, f); }
template <typename F>
constexpr auto fix(F &&f) noexcept {
return [f = std::tuple<F>(std::forward<F>(f))](auto &&...args) mutable {
return std::get<0>(f)(fix(std::get<0>(f)), std::forward<decltype(args)>(args)...);
};
}
#include <atcoder/modint>
using mint = atcoder::modint1000000007;
int main() {
constexpr string_view u = "yukicoder";
constexpr auto set = [&]() {
array<array<char, size(u)>, size(u) + 1> set = {};
for (size_t i = 0; i < size(u); ++i) {
set[0][i] = u[i];
}
for (size_t i = 1; i < size(set); ++i) {
for (size_t j = 0; j < size(u); ++j) {
set[i][j] = u[j];
}
set[i][i - 1] = '?';
}
return set;
}();
int n; cin >> n;
string s; cin >> s;
mint ans = 0;
for (auto t : set) {
auto dp = vec<mint>(0, n + 1, size(t) + 1);
dp[0][0] = 1;
for (int i = 1; i <= n; ++i) {
dp[i][0] = dp[i - 1][0];
for (size_t j = 1; j <= size(t); ++j) {
dp[i][j] = dp[i - 1][j];
if (s[i - 1] == t[j - 1]) {
dp[i][j] += dp[i - 1][j - 1];
}
}
}
ans += dp[n][size(t)];
}
cout << ans.val() << endl;
}
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