結果
問題 | No.1116 Cycles of Dense Graph |
ユーザー | cn_449 |
提出日時 | 2020-07-18 01:31:01 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
WA
|
実行時間 | - |
コード長 | 4,193 bytes |
コンパイル時間 | 1,684 ms |
コンパイル使用メモリ | 147,820 KB |
実行使用メモリ | 9,600 KB |
最終ジャッジ日時 | 2024-05-07 14:44:29 |
合計ジャッジ時間 | 4,822 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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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 |
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testcase_00 | WA | - |
testcase_01 | WA | - |
testcase_02 | WA | - |
testcase_03 | WA | - |
testcase_04 | WA | - |
testcase_05 | WA | - |
testcase_06 | WA | - |
testcase_07 | WA | - |
testcase_08 | WA | - |
testcase_09 | WA | - |
testcase_10 | WA | - |
testcase_11 | WA | - |
testcase_12 | WA | - |
testcase_13 | WA | - |
testcase_14 | WA | - |
testcase_15 | WA | - |
testcase_16 | WA | - |
testcase_17 | WA | - |
testcase_18 | WA | - |
testcase_19 | WA | - |
testcase_20 | WA | - |
testcase_21 | WA | - |
testcase_22 | WA | - |
testcase_23 | WA | - |
testcase_24 | WA | - |
testcase_25 | WA | - |
testcase_26 | WA | - |
testcase_27 | WA | - |
testcase_28 | WA | - |
testcase_29 | WA | - |
testcase_30 | WA | - |
testcase_31 | AC | 10 ms
9,600 KB |
testcase_32 | WA | - |
testcase_33 | AC | 10 ms
9,472 KB |
testcase_34 | AC | 9 ms
9,472 KB |
testcase_35 | WA | - |
testcase_36 | WA | - |
testcase_37 | WA | - |
testcase_38 | WA | - |
testcase_39 | WA | - |
testcase_40 | WA | - |
ソースコード
//あとでしっかり詰める #include <iostream> #include <vector> #include <algorithm> #include <cmath> #include <string> #include <queue> #include <stack> #include <set> #include <map> #include <iomanip> #include <utility> #include <tuple> #include <functional> #include <bitset> #include <cassert> #include <complex> #include <stdio.h> #include <time.h> #include <numeric> #include <random> #include <unordered_map> #include <unordered_set> #define all(a) a.begin(),a.end() #define rep(i, n) for (ll i = 0; i < (n); i++) #define pb push_back #define debug(x) cerr << #x << ':' << x << '\n' #pragma GCC optimize("O3") #pragma GCC optimize("unroll-loops") using namespace std; typedef long long ll; typedef unsigned long long ull; typedef long double ld; typedef pair<ll, ll> P; typedef complex<ld> com; constexpr int inf = 1000000010; constexpr ll INF = 1000000000000000010; constexpr ld eps = 1e-12; constexpr ld pi = 3.141592653589793238; template<class T, class U> inline bool chmax(T &a, const U &b) { if (a < b) { a = b; return true; } return false; } template<class T, class U> inline bool chmin(T &a, const U &b) { if (a > b) { a = b; return true; } return false; } constexpr ll mod = 1000000007; vector<ll> fac, inv, facinv; void modcalc(int modsize) { fac.resize(modsize); inv.resize(modsize); facinv.resize(modsize); fac[0] = 1; fac[1] = 1; inv[1] = 1; facinv[0] = 1; facinv[1] = 1; for (ll i = 2; i < modsize; 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; } } ll modinv(ll a) { a %= mod; if (a == 0) abort(); if (a < (ll)inv.size()) return inv[a]; ll b = mod, u = 1, v = 0; while (b) { ll t = a / b; a -= t * b; swap(a, b); u -= t * v; swap(u, v); } u %= mod; if (u < 0) u += mod; return u; } ll modpow(ll a, ll b) { ll ans = 1; a %= mod; while (b) { if (b & 1) ans = ans * a % mod; a = a * a % mod; b >>= 1; } return ans; } ll modcomb(ll n, ll k) { if (n < 0 || k < 0 || n < k) return 0; return fac[n] * facinv[k] % mod * facinv[n - k] % mod; } ll modperm(ll n, ll k) { if (n < 0 || k < 0 || n < k) return 0; return fac[n] * facinv[n - k] % mod; } ll modhom(ll n, ll k) { if (n < 0 || k < 0 || n == 0 && k > 0) return 0; if (n == 0 && k == 0) return 1; return fac[n + k - 1] * facinv[k] % mod * facinv[n - 1] % mod; } int main() { cin.tie(0); ios::sync_with_stdio(false); cout << fixed << setprecision(20); modcalc(200010); vector<ll> sum(200010); rep(i, 200005) sum[i + 1] = (sum[i] + fac[i]) % mod; int n, m; cin >> n >> m; vector<ll> a(m), b(m); rep(i, m) { cin >> a[i] >> b[i]; a[i]--; b[i]--; } ll ng = 0; for (int i = 1; i < (1 << m); i++) { int pcnt = 0; rep(j, m) if ((i >> j) & 1) pcnt++; map<int, vector<int>> graph; map<int, int> deg; rep(j, m) { if ((i >> j) & 1) { deg[a[j]]++; deg[b[j]]++; graph[a[j]].pb(b[j]); graph[b[j]].pb(a[j]); } } vector<int> use; for (auto x : deg) use.pb(x.first); map<ll, bool> vis; queue<P> que; int cycle = 0; int r = 0; bool ok = true; rep(j, use.size()) { int v = use[j]; if (!vis[v]) { r++; que.push({ v,-1 }); while (!que.empty()) { P p = que.front(); que.pop(); int nowv = p.first; int prev = p.second; vis[nowv] = true; int cnt = 0; for (int nxtv : graph[nowv]) { if (nxtv == prev) continue; cnt++; if (vis[nxtv] && nxtv != v) ok = false; if (nxtv == v) cycle++; if (!vis[nxtv]) { que.push({ nxtv,nowv }); } } if (cnt > 1) ok = false; } } } if (i == 1) debug(cycle), debug(r); if (cycle > 1) ok = false; if (cycle == 1 && r > 1) ok = false; ll res = 0; if (ok) { if (cycle == 1 && r == 1) res = 1; else { res = modpow(2, r - 1) * (sum[n - use.size() + r] - sum[r - 1] + mod) % mod; } } if (pcnt & 1) ng += res; else ng -= res; } ng %= mod; if (ng < 0) ng += mod; ll ans = 0; for (int i = 3; i <= n; i++) { ll c = fac[n] * facinv[n - i] % mod; c *= modinv(2); c %= mod; c *= modinv(i); c %= mod; ans += c; } ans -= ng; ans %= mod; if (ans < 0) ans += mod; cout << ans << '\n'; }