結果

問題 No.1507 Road Blocked
ユーザー uzzyuzzy
提出日時 2021-05-14 22:38:18
言語 C++14
(gcc 13.2.0 + boost 1.83.0)
結果
CE  
(最新)
AC  
(最初)
実行時間 -
コード長 1,292 bytes
コンパイル時間 2,407 ms
コンパイル使用メモリ 174,324 KB
最終ジャッジ日時 2024-04-10 01:21:49
合計ジャッジ時間 3,238 ms
ジャッジサーバーID
(参考情報)
judge3 / judge1
このコードへのチャレンジ
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コンパイルエラー時のメッセージ・ソースコードは、提出者また管理者しか表示できないようにしております。(リジャッジ後のコンパイルエラーは公開されます)
ただし、clay言語の場合は開発者のデバッグのため、公開されます。

コンパイルメッセージ
In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/string:43,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bitset:52,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/x86_64-pc-linux-gnu/bits/stdc++.h:52,
                 from main.cpp:3:
/home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/allocator.h: In destructor 'std::_Vector_base<int, std::allocator<int> >::_Vector_impl::~_Vector_impl()':
/home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/allocator.h:184:7: error: inlining failed in call to 'always_inline' 'std::allocator< <template-parameter-1-1> >::~allocator() noexcept [with _Tp = int]': target specific option mismatch
  184 |       ~allocator() _GLIBCXX_NOTHROW { }
      |       ^
In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/vector:66,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/queue:63,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/x86_64-pc-linux-gnu/bits/stdc++.h:157:
/home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/stl_vector.h:133:14: note: called from here
  133 |       struct _Vector_impl
      |              ^~~~~~~~~~~~

ソースコード

diff #

#pragma GCC optimize ("O2")
#pragma GCC target ("avx")
#include<bits/stdc++.h>
//#include<atcoder/all>
//using namespace atcoder;

using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please

const int mod = 998244353;
constexpr ll modpow(ll A, ll B) {
	ll kotae = 1;
	while (B > 0) {
		if (B & 1) kotae = kotae * A % mod;
		A = A * A % mod;
		B >>= 1;
	}
	return kotae;
}
int N;
vector<int> E[100100];
ll kotae;
int dfs(int u, int mae) {
	int ret = 1;
	for (int v : E[u]) if (v != mae) {
		ll tmp = dfs(v, u);
		kotae += tmp * (N - tmp) * 2;
		ret += tmp;
	}
	return ret;
}

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	cin >> N;
	rep(i, N - 1) {
		int u, v;
		cin >> u >> v;
		E[u].pb(v);
		E[v].pb(u);
	}

	dfs(1, -1);

	kotae = (ll(N - 1) * (N - 1) * N - kotae) % mod;

	co(kotae% mod* modpow(N, mod - 2) % mod* modpow(N - 1, mod - 2) % mod* modpow(N - 1, mod - 2) % mod);




	Would you please return 0;
}
0