結果
問題 | No.1731 Product of Subsequence |
ユーザー | milanis48663220 |
提出日時 | 2021-11-05 21:48:41 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 272 ms / 2,000 ms |
コード長 | 4,384 bytes |
コンパイル時間 | 1,851 ms |
コンパイル使用メモリ | 128,596 KB |
最終ジャッジ日時 | 2025-01-25 12:10:00 |
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 31 |
ソースコード
#include <iostream> #include <algorithm> #include <iomanip> #include <vector> #include <queue> #include <deque> #include <set> #include <map> #include <tuple> #include <cmath> #include <numeric> #include <functional> #include <cassert> #define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl; #define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl; template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; } template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; } using namespace std; typedef long long ll; template<typename T> vector<vector<T>> vec2d(int n, int m, T v){ return vector<vector<T>>(n, vector<T>(m, v)); } template<typename T> vector<vector<vector<T>>> vec3d(int n, int m, int k, T v){ return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, v))); } template<typename T> void print_vector(vector<T> v, char delimiter=' '){ if(v.empty()) { cout << endl; return; } for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter; cout << v.back() << endl; } const ll MOD = 1000000007; class ModInt{ public: ll v; ModInt(ll _v = 0){ if(_v < 0) _v = (_v%MOD)+MOD; if(_v >= MOD) _v %= MOD; v = _v; } ModInt operator+(ll n){ return ModInt((v+n)%MOD); } ModInt operator-(ll n){ return ModInt((v-n+MOD)%MOD); } ModInt operator*(ll n){ if(n >= MOD) n %= MOD; return ModInt((v*n)%MOD); } ModInt operator/(ll n){ return ModInt((ModInt(n).inv()*v).v%MOD); } void operator+=(ll n){ v = (v+n)%MOD; } void operator-=(ll n){ v = (v-n+MOD)%MOD; } void operator*=(ll n){ v = (v*n+MOD)%MOD; } ModInt operator+(ModInt n){ return ModInt((v+n.v)%MOD); } ModInt operator-(ModInt n){ return ModInt((v-n.v+MOD)%MOD); } ModInt operator*(ModInt n){ return ModInt((v*n.v)%MOD); } ModInt operator/(ModInt n){ return ModInt((n.inv()*v).v%MOD); } void operator+=(ModInt n){ v = (v+n.v)%MOD; } void operator-=(ModInt n){ v = (v-n.v+MOD)%MOD; } void operator*=(ModInt n){ v = (v*n.v)%MOD; } void operator=(ModInt n){ v = n.v; } bool operator==(ModInt n){ return v == n.v; } bool operator!=(ModInt n){ return v != n.v; } void operator=(ll n){ v = n%MOD; } ModInt inv(){ if(v == 1) return ModInt(1); else return ModInt(MOD-ModInt(MOD%v).inv().v*(MOD/v)%MOD); } }; ostream& operator<<(ostream& os, const ModInt& m){ os << m.v; return os; } istream & operator >> (istream &in, ModInt &m){ in >> m.v; return in; } template<typename T> class Compress{ public: vector<T> data; int offset; Compress(vector<T> data_, int offset=0): offset(offset){ set<T> st; for(T x: data_) st.insert(x); for(T x: st) data.push_back(x); }; int operator[](T x) { auto p = lower_bound(data.begin(), data.end(), x); assert(x == *p); return offset+(p-data.begin()); } T inv(int x){ return data[x-offset]; } int size(){ return data.size(); } }; vector<ll> facs(ll n){ vector<ll> ans; for(int i = 1; i*i <= n ; i++){ if(n%i == 0){ ans.push_back(i); if(i*i != n) ans.push_back(n/i); } } sort(ans.begin(), ans.end()); return ans; } using mint = ModInt; int main(){ ios::sync_with_stdio(false); cin.tie(0); cout << setprecision(10) << fixed; int n; ll k; cin >> n >> k; vector<ll> a(n); for(int i = 0; i < n; i++) cin >> a[i]; auto f = facs(k); auto cp = Compress<ll>(f); int m = cp.size(); auto dp = vec2d(n+1, m+1, mint(0)); dp[0][cp[1]] = 1; for(int i = 0; i < n; i++){ ll g = gcd(a[i], k); for(int j = 0; j < m; j++){ ll cur = cp.data[j]; ll nx = gcd(k, g*cur); dp[i+1][cp[nx]] += dp[i][j]; dp[i+1][j] += dp[i][j]; // debug_value(nx); } } if(k == 1) cout << dp[n][cp[k]]-1 << endl; else cout << dp[n][cp[k]] << endl; }