結果
問題 | No.573 a^2[i] = a[i] |
ユーザー |
|
提出日時 | 2017-10-06 23:40:50 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 27 ms / 2,000 ms |
コード長 | 4,206 bytes |
コンパイル時間 | 3,528 ms |
コンパイル使用メモリ | 214,188 KB |
最終ジャッジ日時 | 2025-01-05 03:06:43 |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
other | AC * 47 |
ソースコード
#pragma GCC optimize ("O3")#pragma GCC target ("avx")#include "bits/stdc++.h" // define macro "/D__MAI"using namespace std;typedef long long int ll;#define xprintf(fmt,...) fprintf(stderr,fmt,__VA_ARGS__)#define debugv(v) {printf("L%d %s > ",__LINE__,#v);for(auto e:v){cout<<e<<" ";}cout<<endl;}#define debuga(m,w) {printf("L%d %s > ",__LINE__,#m);for(int x=0;x<(w);x++){cout<<(m)[x]<<" ";}cout<<endl;}#define debugaa(m,h,w) {printf("L%d %s >\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){cout<<(m)[y][x]<<" ";}cout<<endl;}}#define ALL(v) (v).begin(),(v).end()#define repeat(cnt,l) for(auto cnt=0ll;(cnt)<(l);++(cnt))#define iterate(cnt,b,e) for(auto cnt=(b);(cnt)!=(e);++(cnt))#define MD 1000000007ll#define PI 3.1415926535897932384626433832795#define EPS 1e-12template<typename T1, typename T2> ostream& operator <<(ostream &o, const pair<T1, T2> p) { o << "(" << p.first << ":" << p.second << ")"; return o;}template<typename iterator> inline size_t argmin(iterator begin, iterator end) { return distance(begin, min_element(begin, end)); }template<typename iterator> inline size_t argmax(iterator begin, iterator end) { return distance(begin, max_element(begin, end)); }template<typename T> T& maxset(T& to, const T& val) { return to = max(to, val); }template<typename T> T& minset(T& to, const T& val) { return to = min(to, val); }mt19937_64 randdev(8901016);inline ll rand_range(ll l, ll h) {return uniform_int_distribution<ll>(l, h)(randdev);}#ifdef __MAI#define getchar_unlocked getchar#define putchar_unlocked putchar#endif#ifdef __VSCC#define getchar_unlocked _getchar_nolock#define putchar_unlocked _putchar_nolock#endifnamespace {#define isvisiblechar(c) (0x21<=(c)&&(c)<=0x7E)class MaiScanner {public:template<typename T> void input_integer(T& var) {var = 0;T sign = 1;int cc = getchar_unlocked();for (; cc<'0' || '9'<cc; cc = getchar_unlocked())if (cc == '-') sign = -1;for (; '0' <= cc&&cc <= '9'; cc = getchar_unlocked())var = (var << 3) + (var << 1) + cc - '0';var = var*sign;}inline int c() { return getchar_unlocked(); }inline MaiScanner& operator>>(int& var) {input_integer<int>(var);return *this;}inline MaiScanner& operator>>(long long& var) {input_integer<long long>(var);return *this;}inline MaiScanner& operator>>(string& var) {int cc = getchar_unlocked();for (; !isvisiblechar(cc); cc = getchar_unlocked());for (; isvisiblechar(cc); cc = getchar_unlocked())var.push_back(cc);return *this;}template<typename IT> void in(IT begin, IT end) {for (auto it = begin; it != end; ++it) *this >> *it;}};}MaiScanner scanner;// power// x^p 対数mod// MEMO : 逆元...powm(n,E107-2,E107)template<typename T>T powm(T x, T p, T mod = 1000000007ll) {T y = 1;x = x%mod;while (0<p) {if (p % 2 == 1) {y = (y*x) % mod;}x = (x*x) % mod;p /= 2;}return y;}template<typename T>T combim(T n, T r, T mod = 1000000007ll) {if (n / 2 < r) return combim(n, n - r);T p = 1;for (; 0<r; r--)p = (((p*(n - r + 1)) % mod)*powm(r, mod - 2)) % mod;return p;}ll m, n, kei;ll cbm[100010];int main() {scanner >> n;{// create combination tablell p = 1;cbm[0] = 1;for (ll r=1; r<=n; ++r)p = cbm[r] = (((p*(n - r + 1)) % MD)*powm(r, MD - 2)) % MD;}// とある集合Sを選ぶ.// x in S : a[x] = x// y in ~S : a[y] = t : t in S// これを数え上げれば良さそう.// |S| ごとに数え上げられそう// あるSを考えると,// |S| ** (N - |S|)// これが,|S|の combination(N, |S|) 個あるll ans = 0;iterate(c, 1ll, n + 1) {ans += powm(c, n - c)*cbm[c];ans %= MD;}cout << ans << endl;return 0;}