結果
問題 | No.827 総神童数 |
ユーザー | 👑 hitonanode |
提出日時 | 2019-06-28 22:13:36 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 228 ms / 2,000 ms |
コード長 | 4,591 bytes |
コンパイル時間 | 1,725 ms |
コンパイル使用メモリ | 177,584 KB |
実行使用メモリ | 43,912 KB |
最終ジャッジ日時 | 2023-09-14 22:06:45 |
合計ジャッジ時間 | 8,373 ms |
ジャッジサーバーID (参考情報) |
judge14 / judge11 |
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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 | 1 ms
4,376 KB |
testcase_01 | AC | 2 ms
4,376 KB |
testcase_02 | AC | 2 ms
4,380 KB |
testcase_03 | AC | 2 ms
4,376 KB |
testcase_04 | AC | 1 ms
4,376 KB |
testcase_05 | AC | 2 ms
4,376 KB |
testcase_06 | AC | 1 ms
4,380 KB |
testcase_07 | AC | 2 ms
4,380 KB |
testcase_08 | AC | 2 ms
4,376 KB |
testcase_09 | AC | 164 ms
43,912 KB |
testcase_10 | AC | 55 ms
16,728 KB |
testcase_11 | AC | 3 ms
4,376 KB |
testcase_12 | AC | 21 ms
9,452 KB |
testcase_13 | AC | 128 ms
36,172 KB |
testcase_14 | AC | 5 ms
4,644 KB |
testcase_15 | AC | 48 ms
16,332 KB |
testcase_16 | AC | 132 ms
33,232 KB |
testcase_17 | AC | 155 ms
39,164 KB |
testcase_18 | AC | 65 ms
19,844 KB |
testcase_19 | AC | 228 ms
34,688 KB |
testcase_20 | AC | 165 ms
26,408 KB |
testcase_21 | AC | 114 ms
20,072 KB |
testcase_22 | AC | 183 ms
28,844 KB |
testcase_23 | AC | 2 ms
4,376 KB |
testcase_24 | AC | 200 ms
31,444 KB |
testcase_25 | AC | 148 ms
24,572 KB |
testcase_26 | AC | 200 ms
31,364 KB |
testcase_27 | AC | 127 ms
22,080 KB |
testcase_28 | AC | 128 ms
21,776 KB |
testcase_29 | AC | 97 ms
17,988 KB |
testcase_30 | AC | 21 ms
7,892 KB |
testcase_31 | AC | 73 ms
14,928 KB |
testcase_32 | AC | 68 ms
14,364 KB |
testcase_33 | AC | 225 ms
33,884 KB |
testcase_34 | AC | 205 ms
31,376 KB |
testcase_35 | AC | 75 ms
14,892 KB |
testcase_36 | AC | 111 ms
19,860 KB |
testcase_37 | AC | 150 ms
24,628 KB |
testcase_38 | AC | 219 ms
33,440 KB |
ソースコード
#include <bits/stdc++.h> using namespace std; using lint = long long int; using pint = pair<int, int>; using plint = pair<lint, lint>; struct fast_ios { fast_ios(){ cin.tie(0); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_; #define ALL(x) (x).begin(), (x).end() #define SZ(x) ((lint)(x).size()) #define POW2(n) (1LL << (n)) #define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++) #define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--) #define REP(i, n) FOR(i,0,n) #define IREP(i, n) IFOR(i,0,n) template<typename T> void ndarray(vector<T> &vec, int len) { vec.resize(len); } template<typename T, typename... Args> void ndarray(vector<T> &vec, int len, Args... args) { vec.resize(len); for (auto &v : vec) ndarray(v, args...); } template<typename T> bool mmax(T &m, const T q) { if (m < q) {m = q; return true;} else return false; } template<typename T> bool mmin(T &m, const T q) { if (m > q) {m = q; return true;} else return false; } template<typename T1, typename T2> pair<T1, T2> operator+(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first + r.first, l.second + r.second); } template<typename T1, typename T2> pair<T1, T2> operator-(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first - r.first, l.second - r.second); } template<typename T> istream &operator>>(istream &is, vector<T> &vec){ for (auto &v : vec) is >> v; return is; } ///// This part below is only for debug, not used ///// template<typename T> ostream &operator<<(ostream &os, const vector<T> &vec){ os << "["; for (auto v : vec) os << v << ","; os << "]"; return os; } template<typename T> ostream &operator<<(ostream &os, const deque<T> &vec){ os << "deq["; for (auto v : vec) os << v << ","; os << "]"; return os; } template<typename T> ostream &operator<<(ostream &os, const set<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; } template<typename T> ostream &operator<<(ostream &os, const unordered_set<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; } template<typename T> ostream &operator<<(ostream &os, const multiset<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; } template<typename T> ostream &operator<<(ostream &os, const unordered_multiset<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; } template<typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &pa){ os << "(" << pa.first << "," << pa.second << ")"; return os; } template<typename TK, typename TV> ostream &operator<<(ostream &os, const map<TK, TV> &mp){ os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; } template<typename TK, typename TV> ostream &operator<<(ostream &os, const unordered_map<TK, TV> &mp){ os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; } #define dbg(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ") " << __FILE__ << endl; ///// END ///// /* #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> #include <ext/pb_ds/tag_and_trait.hpp> using namespace __gnu_pbds; // find_by_order(), order_by_key() template<typename TK> using pbds_set = tree<TK, null_type, less<TK>, rb_tree_tag, tree_order_statistics_node_update>; template<typename TK, typename TV> using pbds_map = tree<TK, TV, less<TK>, rb_tree_tag, tree_order_statistics_node_update>; */ constexpr lint MOD = 1000000007; vector<lint> fac, facInv, inv; void facInit(int nmax) { fac = facInv = inv = vector<lint>(nmax + 1, 1); for (int i = 2; i <= nmax; i++) { fac[i] = fac[i-1] * i % MOD; inv[i] = MOD - inv[MOD%i] * (MOD/i) % MOD; facInv[i] = facInv[i-1] * inv[i] % MOD; } } lint nCr(int n, int r) { if (n<r || r<0) return 0; if (n >= (int)fac.size()) facInit(n); return (fac[n] * facInv[r] % MOD) * facInv[n-r] % MOD; } lint nPr(int n, int r) { if (n<r || r<0) return 0; if (n >= (int)fac.size()) facInit(n); return fac[n] * facInv[n-r] % MOD; } vector<set<int>> e; int N; lint ret; void dfs(int now, int prv, int depth) { (ret += nCr(N, depth) * fac[depth - 1] % MOD * fac[N - depth]) %= MOD; for (auto nxt : e[now]) if (nxt != prv) dfs(nxt, now, depth + 1); } int main() { cin >> N; facInit(N); e.resize(N + 1); REP(_, N - 1) { int u, v; cin >> u >> v; e[u].insert(v); e[v].insert(u); } ret = 0; dfs(1, -1, 1); cout << ret << endl; }