結果
問題 | No.1507 Road Blocked |
ユーザー | suta28407928 |
提出日時 | 2021-05-14 22:24:01 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 119 ms / 2,000 ms |
コード長 | 4,899 bytes |
コンパイル時間 | 2,669 ms |
コンパイル使用メモリ | 190,200 KB |
実行使用メモリ | 15,488 KB |
最終ジャッジ日時 | 2024-11-15 01:04:18 |
合計ジャッジ時間 | 7,661 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 2 ms
6,816 KB |
testcase_01 | AC | 2 ms
6,820 KB |
testcase_02 | AC | 2 ms
6,820 KB |
testcase_03 | AC | 77 ms
15,488 KB |
testcase_04 | AC | 118 ms
9,984 KB |
testcase_05 | AC | 112 ms
9,984 KB |
testcase_06 | AC | 113 ms
9,936 KB |
testcase_07 | AC | 117 ms
9,984 KB |
testcase_08 | AC | 117 ms
9,984 KB |
testcase_09 | AC | 110 ms
9,984 KB |
testcase_10 | AC | 114 ms
9,984 KB |
testcase_11 | AC | 115 ms
9,980 KB |
testcase_12 | AC | 115 ms
10,048 KB |
testcase_13 | AC | 114 ms
9,856 KB |
testcase_14 | AC | 113 ms
9,984 KB |
testcase_15 | AC | 115 ms
10,112 KB |
testcase_16 | AC | 119 ms
10,112 KB |
testcase_17 | AC | 116 ms
9,984 KB |
testcase_18 | AC | 115 ms
9,984 KB |
testcase_19 | AC | 115 ms
9,984 KB |
testcase_20 | AC | 114 ms
9,976 KB |
testcase_21 | AC | 116 ms
9,984 KB |
testcase_22 | AC | 116 ms
10,112 KB |
testcase_23 | AC | 112 ms
9,984 KB |
testcase_24 | AC | 114 ms
10,112 KB |
testcase_25 | AC | 115 ms
9,984 KB |
testcase_26 | AC | 111 ms
10,000 KB |
testcase_27 | AC | 112 ms
9,984 KB |
testcase_28 | AC | 109 ms
10,076 KB |
testcase_29 | AC | 110 ms
9,984 KB |
testcase_30 | AC | 115 ms
9,984 KB |
testcase_31 | AC | 113 ms
10,112 KB |
testcase_32 | AC | 109 ms
9,984 KB |
ソースコード
#pragma GCC target("avx2") #pragma GCC optimize("Ofast") #pragma GCC optimize("unroll-loops") #include <bits/stdc++.h> //#include <atcoder/all> using namespace std; //using namespace atcoder; #define DEBUG #ifdef DEBUG template <class T, class U> ostream &operator<<(ostream &os, const pair<T, U> &p) { os << '(' << p.first << ',' << p.second << ')'; return os; } template <class T> ostream &operator<<(ostream &os, const vector<T> &v) { os << '{'; for(int i = 0; i < (int)v.size(); i++) { if(i) { os << ','; } os << v[i]; } os << '}'; return os; } void debugg() { cerr << endl; } template <class T, class... Args> void debugg(const T &x, const Args &... args) { cerr << " " << x; debugg(args...); } #define debug(...) \ cerr << __LINE__ << " [" << #__VA_ARGS__ << "]: ", debugg(__VA_ARGS__) #define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl #else #define debug(...) (void(0)) #define dump(x) (void(0)) #endif using namespace std; typedef long long ll; typedef vector<ll> vl; typedef vector<vl> vvl; typedef vector<char> vc; typedef vector<string> vs; typedef vector<bool> vb; typedef vector<double> vd; typedef pair<ll,ll> P; typedef pair<int,int> pii; typedef vector<P> vpl; typedef tuple<ll,ll,ll> tapu; #define rep(i,n) for(int i=0; i<(n); i++) #define REP(i,a,b) for(int i=(a); i<(b); i++) #define all(x) (x).begin(), (x).end() #define rall(x) (x).rbegin(), (x).rend() const int inf = (1<<30)-1; const ll linf = 1LL<<61; const int MAX = 510000; int dy[8] = {0,1,0,-1,1,-1,-1,1}; int dx[8] = {-1,0,1,0,1,-1,1,-1}; const double pi = acos(-1); const double eps = 1e-9; template<typename T1,typename T2> inline bool chmin(T1 &a,T2 b){ if(a>b){ a = b; return true; } else return false; } template<typename T1,typename T2> inline bool chmax(T1 &a,T2 b){ if(a<b){ a = b; return true; } else return false; } template<typename T> inline void print(T &a){ int sz = a.size(); for(auto itr = a.begin(); itr != a.end(); itr++){ cout << *itr; sz--; if(sz) cout << " "; } cout << "\n"; } template<typename T1,typename T2> inline void print2(T1 a, T2 b){ cout << a << " " << b << "\n"; } template<typename T1,typename T2,typename T3> inline void print3(T1 a, T2 b, T3 c){ cout << a << " " << b << " " << c << "\n"; } void mark() {cout << "#" << "\n";} ll pcount(ll x) {return __builtin_popcountll(x);} //const int mod = 1e9 + 7; const int mod = 998244353; template <int mod> struct ModInt { int x; ModInt() : x(0) {} ModInt(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {} ModInt &operator+=(const ModInt &p) { if((x += p.x) >= mod) x -= mod; return *this; } ModInt &operator-=(const ModInt &p) { if((x += mod - p.x) >= mod) x -= mod; return *this; } ModInt &operator*=(const ModInt &p) { x = (int)(1LL * x * p.x % mod); return *this; } ModInt &operator/=(const ModInt &p) { *this *= p.inverse(); return *this; } ModInt operator-() const { return ModInt(-x); } ModInt operator+(const ModInt &p) const { return ModInt(*this) += p; } ModInt operator-(const ModInt &p) const { return ModInt(*this) -= p; } ModInt operator*(const ModInt &p) const { return ModInt(*this) *= p; } ModInt operator/(const ModInt &p) const { return ModInt(*this) /= p; } bool operator==(const ModInt &p) const { return x == p.x; } bool operator!=(const ModInt &p) const { return x != p.x; } ModInt inverse() const { int a = x, b = mod, u = 1, v = 0, t; while(b > 0) { t = a / b; swap(a -= t * b, b); swap(u -= t * v, v); } return ModInt(u); } ModInt pow(int64_t n) const { ModInt ret(1), mul(x); while(n > 0) { if(n & 1) ret *= mul; mul *= mul; n >>= 1; } return ret; } friend ostream &operator<<(ostream &os, const ModInt &p) { return os << p.x; } friend istream &operator>>(istream &is, ModInt &a) { int64_t t; is >> t; a = ModInt<mod>(t); return (is); } static int get_mod() { return mod; } }; using mint = ModInt<mod>; int main(){ ll n; cin >> n; vvl G(n); rep(i,n-1){ int u,v; cin >> u >> v; u--; v--; G[v].push_back(u); G[u].push_back(v); } mint ans = n*(n-1)/2*(n-1) % mod; vl c(n,1); auto dfs = [&](auto &&dfs, int u, int p) -> void { for(auto v : G[u]){ if(v == p) continue; dfs(dfs,v,u); c[u] += c[v]; ans -= c[v] * (n - c[v]); //debug(v,c[v]*(n-c[v])); } }; dfs(dfs,0,-1); ans /= n*(n-1)/2*(n-1); cout << ans << endl; }