結果
| 問題 | No.391 CODING WAR |
| ユーザー |
 koyumeishi
|
| 提出日時 | 2016-07-08 23:00:09 |
| 言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
| 結果 |
AC
|
| 実行時間 | 73 ms / 2,000 ms |
| コード長 | 10,645 bytes |
| コンパイル時間 | 1,108 ms |
| コンパイル使用メモリ | 106,512 KB |
| 実行使用メモリ | 18,944 KB |
| 最終ジャッジ日時 | 2024-10-13 06:27:30 |
| 合計ジャッジ時間 | 2,868 ms |
|
ジャッジサーバーID （参考情報） |
judge3 / judge2 |
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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 | 48 ms
18,944 KB |
| testcase_01 | AC | 48 ms
18,816 KB |
| testcase_02 | AC | 47 ms
18,944 KB |
| testcase_03 | AC | 48 ms
18,944 KB |
| testcase_04 | AC | 47 ms
18,816 KB |
| testcase_05 | AC | 1 ms
5,248 KB |
| testcase_06 | AC | 47 ms
18,944 KB |
| testcase_07 | AC | 46 ms
18,816 KB |
| testcase_08 | AC | 50 ms
18,816 KB |
| testcase_09 | AC | 73 ms
18,816 KB |
| testcase_10 | AC | 71 ms
18,944 KB |
| testcase_11 | AC | 2 ms
5,248 KB |
| testcase_12 | AC | 51 ms
18,944 KB |
| testcase_13 | AC | 68 ms
18,816 KB |
| testcase_14 | AC | 67 ms
18,944 KB |
| testcase_15 | AC | 71 ms
18,944 KB |
| testcase_16 | AC | 59 ms
18,816 KB |
| testcase_17 | AC | 62 ms
18,944 KB |
| testcase_18 | AC | 55 ms
18,944 KB |
| testcase_19 | AC | 56 ms
18,944 KB |
ソースコード
/*
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#
##
*/
#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>
#include <functional>
#include <set>
#include <ctime>
#include <random>
#include <chrono>
#include <cassert>
using namespace std;
namespace {
using Integer = long long; //__int128;
template<class T> istream& operator >> (istream& is, vector<T>& vec){for(T& val: vec) is >> val; return is;}
template<class T> istream& operator , (istream& is, T& val){ return is >> val;}
template<class T> ostream& operator << (ostream& os, const vector<T>& vec){for(int i=0; i<vec.size(); i++) os << vec[i] << (i==vec.size()-1?"":" "); return os;}
template<class T> ostream& operator , (ostream& os, const T& val){ return os << " " << val;}
template<class H> void print(const H& head){ cout << head; }
template<class H, class ... T> void print(const H& head, const T& ... tail){ cout << head << " "; print(tail...); }
template<class ... T> void println(const T& ... values){ print(values...); cout << endl; }
template<class H> void eprint(const H& head){ cerr << head; }
template<class H, class ... T> void eprint(const H& head, const T& ... tail){ cerr << head << " "; eprint(tail...); }
template<class ... T> void eprintln(const T& ... values){ eprint(values...); cerr << endl; }
class range{
long long start_, end_, step_;
public:
struct range_iterator{
long long val, step_;
range_iterator(long long v, long long step) : val(v), step_(step) {}
long long operator * (){return val;}
void operator ++ (){val += step_;}
bool operator != (range_iterator& x){return step_ > 0 ? val < x.val : val > x.val;}
};
range(long long len) : start_(0), end_(len), step_(1) {}
range(long long start, long long end) : start_(start), end_(end), step_(1) {}
range(long long start, long long end, long long step) : start_(start), end_(end), step_(step) {}
range_iterator begin(){ return range_iterator(start_, step_); }
range_iterator end(){ return range_iterator( end_, step_); }
};
string operator "" _s (const char* str, size_t size){ return move(string(str)); }
constexpr Integer my_pow(Integer x, Integer k, Integer z=1){return k==0 ? z : k==1 ? z*x : (k&1) ? my_pow(x*x,k>>1,z*x) : my_pow(x*x,k>>1,z);}
constexpr Integer my_pow_mod(Integer x, Integer k, Integer M, Integer z=1){return k==0 ? z%M : k==1 ? z*x%M : (k&1) ? my_pow_mod(x*x%M,k>>1,M,z*x%M) : my_pow_mod(x*x%M,k>>1,M,z);}
constexpr unsigned long long operator "" _ten (unsigned long long value){ return my_pow(10,value); }
inline int k_bit(Integer x, int k){return (x>>k)&1;} //0-indexed
mt19937 mt(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count());
template<class T> string join(const vector<T>& v, const string& sep){
stringstream ss; for(int i=0; i<v.size(); i++){ if(i>0) ss << sep; ss << v[i]; } return ss.str();
}
string operator * (string s, int k){ string ret; while(k){ if(k&1) ret += s; s += s; k >>= 1; } return ret; }
}
constexpr long long mod = 9_ten + 7;
//using montgomery reduction
//-----------------------------------------------------------------------
namespace Montgomery{
template<long long MOD>
constexpr long long PRE_COMP(long long r, long long res=0, long long t=0, long long i = 1){
return (r>1) ? ( PRE_COMP<MOD>(r/2, res + (t%2==0?i:0), (t%2==0?(t+MOD):t) / 2, i*2) ):( res );
}
template<long long MOD>
class Values{
public:
static constexpr long long R = 1LL<<30; // R>MOD && gcd(R,MOD)==1
static constexpr long long mask = (1LL<<30)-1;
static constexpr long long R2 = (R*R)%MOD;
static constexpr long long Ninv = PRE_COMP<MOD>(1<<30); // N*Ninv = R-1 mod R
static long long Reduction(long long x){
long long s = ((x & mask) * Ninv) & mask;
long long ret = (x + s*MOD ) >> 30;
if(ret>=MOD) ret -= MOD;
return ret;
}
};
template<long long MOD> struct M_Int{
long long value;
M_Int() : value(0) {}
M_Int(long long val, bool convert=true) : value(convert ? Values<MOD>::Reduction(val * Values<MOD>::R2) : val){} //convert==true : int -> M_Int, false : M_Int::value -> M_Int
M_Int(const M_Int& x) : value( x.value ){} //M_Int -> M_Int
M_Int& operator = (const M_Int& x){ value = x.value; return *this; }
M_Int& operator = (const long long& x){ value = Values<MOD>::Reduction(x * Values<MOD>::R2); return *this; }
M_Int operator * (const M_Int& x) { return M_Int( Values<MOD>::Reduction(value * x.value) , false ); }
M_Int operator * (const long long& x){ return (*this) * M_Int(x); }
template<class T> M_Int& operator *= (const T& x){ return (*this) = (*this)*x; }
M_Int operator + (const M_Int& x) { long long tmp = value + x.value; if(tmp >= MOD) tmp -= MOD; return M_Int(tmp, false); }
M_Int operator + (const long long& x){ return (*this)+M_Int(x); }
template<class T> M_Int& operator += (const T& x) { return (*this) = (*this) + x; }
M_Int operator - (const M_Int& x) { long long tmp = value - x.value; if(tmp < 0 ) tmp += MOD; return M_Int(tmp, false); }
M_Int operator - (const long long& x){ return (*this)-M_Int(x); }
template<class T> M_Int& operator -= (const T& x) { return (*this) = (*this) - x; }
bool operator == (const M_Int& x){ return value == x.value; }
bool operator == (const long long& x){ M_Int tmp(x); return (*this)==tmp; }
long long to_i () { // M_int -> int
return Values<MOD>::Reduction(value);
}
operator long long () { // M_int -> int
return Values<MOD>::Reduction(value);
}
};
template<long long MOD> istream& operator>>(istream& is, M_Int<MOD>& v){ long long tmp; is >> tmp; v=tmp; return is; }
template<long long MOD> ostream& operator<<(ostream& os, M_Int<MOD> v){ return os << v.to_i(); }
template<long long MOD> M_Int<MOD> operator + (long long l, M_Int<MOD> r){ return r+l; }
template<long long MOD> M_Int<MOD> operator - (long long l, M_Int<MOD> r){ return r-l; }
template<long long MOD> M_Int<MOD> operator * (long long l, M_Int<MOD> r){ return r*l; }
}
using mint = Montgomery::M_Int<1000000007>;
// nCk mod p, O(1)
// precomputation O(size)
template<long long MOD>
class combination_mod{
using mint = Montgomery::M_Int<MOD>;
const long long size;
vector<mint> fact; //n!
vector<mint> fact_inv; // (n!)^-1
void make_fact(){
fact[0] = 1;
for(long long i=1; i<size; i++){
fact[i] = fact[i-1]*i;
}
}
void make_fact_inv(){
fact_inv[0] = fact_inv[1] = 1;
for(long long i=2; i<size; i++){
fact_inv[i] = fact_inv[MOD%i] * (MOD - MOD/i); // x ^ -1
}
for(int i=2; i<size; i++){
fact_inv[i] = fact_inv[i-1] * fact_inv[i]; // x! ^ -1
}
}
public:
combination_mod(long long size_ = 2000000) : size(size_+1){
fact.resize(size);
fact_inv.resize(size);
make_fact();
make_fact_inv();
}
//nCk mod p O(1)
mint comb(long long n, long long k){
if(k==0 || n==k) return mint(1);
return fact[n] * fact_inv[k] * fact_inv[n-k];
}
};
mint poooooooooooooooooooow(mint x, long long y){
mint ret = 1;
while(y){
if(y&1) ret = ret * x;
x = x * x;
y >>= 1;
}
return ret;
}
int main(){
long long n,m;
cin >> n,m;
if(n<m){
println(0);
return 0;
}
combination_mod<1000000007> c(1000004);
mint u = 1;
mint v = mod-1;
mint ans = 0;
for(int i=1; i<=m; i++){
ans += ((m-i)%2?v:u) * c.comb(m, i) * poooooooooooooooooooow(i, n);
}
println(ans.to_i());
return 0;
}