結果
| 問題 | No.125 悪の花弁 |
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2016-09-19 00:40:28 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 2,381 ms / 5,000 ms |
| コード長 | 3,068 bytes |
| コンパイル時間 | 1,937 ms |
| コンパイル使用メモリ | 175,248 KB |
| 実行使用メモリ | 126,252 KB |
| 最終ジャッジ日時 | 2024-11-17 09:08:24 |
| 合計ジャッジ時間 | 16,918 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 6 |
ソースコード
#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
template<int MOD>
class ModInt{
public:
ModInt():value(0){}
ModInt(long long val):value((int)(val<0?MOD+val%MOD:val%MOD)){ }
ModInt& operator+=(ModInt that){
value = value+that.value;
if(value>=MOD)value-=MOD;
return *this;
}
ModInt& operator-=(ModInt that){
value -= that.value;
if(value<0)value+=MOD;
return *this;
}
ModInt& operator*=(ModInt that){
value = (int)((long long)value * that.value % MOD);
return *this;
}
ModInt &operator/=(ModInt that){
return *this *= that.inverse();
}
ModInt operator+(ModInt that) const{
return ModInt(*this)+=that;
}
ModInt operator-(ModInt that) const{
return ModInt(*this)-=that;
}
ModInt operator*(ModInt that) const{
return ModInt(*this)*=that;
}
ModInt operator/(ModInt that) const {
return ModInt(*this) /= that;
}
ModInt pow(long long k) const{
if(value == 0)return 0;
ModInt n = *this, res = 1;
while(k){
if(k & 1)res *= n;
n *= n;
k >>= 1;
}
return res;
}
ModInt inverse() const {
long long a = value, b = MOD, u = 1, v = 0;
while(b) {
long long t = a / b;
a -= t * b;
swap(a, b);
u -= t * v;
swap(u, v);
}
return ModInt(u);
}
int toi() const{ return value; }
private:
int value;
};
typedef ModInt<1000000007> mint;
ostream& operator<<(ostream& os, const mint& x){
os << x.toi();
return os;
}
vector<vector<int>> divisorsAll(int n){
vector<vector<int>> res(n + 1);
for(int i = 1; i <= n; ++i){
for(int j = i; j <= n; j+=i){
res[j].push_back(i);
}
}
return res;
}
int K;
int main(){
cin >> K;
vi C(K), D(K);
rep(i, K)scanf("%d", &C[i]);
int N = accumulate(all(C), 0);
vector<mint> dp(N + 1), F(N + 1);
F[0] = 1;
rep(i, N)F[i + 1] = F[i] * (i+1);
auto divs = divisorsAll(N);
each(i, divs[N]){
int a = N / i;
bool ok = true;
rep(j, K){
if(C[j] % a){
ok = false;
break;
}
D[j] = C[j] / a;
}
if(!ok)continue;
dp[i] = F[i];
each(d, D)dp[i] /= F[d];
each(j, divs[i]){
if(j == i)break;
dp[i] -= dp[j];
}
}
mint ans = 0;
FOR(i, 1, N + 1)ans += dp[i] / i;
cout << ans << endl;
}