結果

問題 No.2504 NOT Path Painting
ユーザー risujirohrisujiroh
提出日時 2023-10-13 21:51:08
言語 C++23
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 144 ms / 2,000 ms
コード長 3,379 bytes
コンパイル時間 3,810 ms
コンパイル使用メモリ 263,528 KB
実行使用メモリ 7,700 KB
最終ジャッジ日時 2024-09-15 17:31:39
合計ジャッジ時間 6,857 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
other AC * 21
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

#if __INCLUDE_LEVEL__ == 0
#include __BASE_FILE__
namespace {
using Fp = atcoder::modint998244353;
void solve() {
int n;
scan(n);
vector<vector<int>> g(n);
for (int _ = n - 1; _--;) {
int i, j;
scan(i, j);
--i, --j;
g[i].push_back(j);
g[j].push_back(i);
}
vector<int> sub(n, 1);
fix([&](auto self, int i) -> void {
for (int j : g[i]) {
g[j].erase(ranges::find(g[j], i));
self(j);
sub[i] += sub[j];
}
})(0);
int n2 = n * (n + 1) / 2;
Fp ans = 0;
for (int i : rep(n)) {
Fp cur = (n - sub[i]) * (n - sub[i] + 1) / 2;
for (int j : g[i]) {
cur += sub[j] * (sub[j] + 1) / 2;
}
ans += n2 / cur;
}
for (int i : rep(1, n)) {
ans -= n2 / Fp(n2 - sub[i] * (n - sub[i]));
}
print(ans);
}
} // namespace
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t;
scan(t);
while (t--) {
solve();
}
}
#else // __INCLUDE_LEVEL__
#include <bits/stdc++.h>
using namespace std;
#include <atcoder/modint>
namespace std {
template <class T1, class T2>
istream& operator>>(istream& is, pair<T1, T2>& p) {
return is >> p.first >> p.second;
}
template <class... Ts>
istream& operator>>(istream& is, tuple<Ts...>& t) {
return apply([&is](auto&... xs) -> istream& { return (is >> ... >> xs); }, t);
}
template <class R, enable_if_t<!is_convertible_v<R, string>>* = nullptr>
auto operator>>(istream& is, R&& r) -> decltype(is >> *begin(r)) {
for (auto&& e : r) {
is >> e;
}
return is;
}
template <class T1, class T2>
ostream& operator<<(ostream& os, const pair<T1, T2>& p) {
return os << p.first << ' ' << p.second;
}
template <class... Ts>
ostream& operator<<(ostream& os, const tuple<Ts...>& t) {
auto f = [&os](const auto&... xs) -> ostream& {
[[maybe_unused]] auto sep = "";
((os << exchange(sep, " ") << xs), ...);
return os;
};
return apply(f, t);
}
template <class R, enable_if_t<!is_convertible_v<R, string_view>>* = nullptr>
auto operator<<(ostream& os, R&& r) -> decltype(os << *begin(r)) {
auto sep = "";
for (auto&& e : r) {
os << exchange(sep, " ") << e;
}
return os;
}
} // namespace std
namespace atcoder {
template <class T, internal::is_modint_t<T>* = nullptr>
istream& operator>>(istream& is, T& x) {
int v;
is >> v;
x = T::raw(v);
return is;
}
template <class T, internal::is_modint_t<T>* = nullptr>
ostream& operator<<(ostream& os, const T& x) {
return os << x.val();
}
} // namespace atcoder
template <class... Ts>
void scan(Ts&&... xs) {
(cin >> ... >> xs);
}
template <class... Ts>
void print(Ts&&... xs) {
cout << tie(xs...) << '\n';
}
template <class F>
class fix {
public:
explicit fix(F f) : f_(move(f)) {}
template <class... Ts>
decltype(auto) operator()(Ts&&... xs) const {
return f_(ref(*this), forward<Ts>(xs)...);
}
private:
F f_;
};
inline auto rep(int l, int r) { return views::iota(min(l, r), r); }
inline auto rep(int n) { return rep(0, n); }
inline auto rep1(int l, int r) { return rep(l, r + 1); }
inline auto rep1(int n) { return rep(1, n + 1); }
inline auto per(int l, int r) { return rep(l, r) | views::reverse; }
inline auto per(int n) { return per(0, n); }
inline auto per1(int l, int r) { return per(l, r + 1); }
inline auto per1(int n) { return per(1, n + 1); }
inline auto len = ranges::ssize;
#endif // __INCLUDE_LEVEL__
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