結果
| 問題 |
No.997 Jumping Kangaroo
|
| コンテスト | |
| ユーザー |
QCFium
|
| 提出日時 | 2020-02-21 22:31:14 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 2 ms / 2,000 ms |
| コード長 | 3,500 bytes |
| コンパイル時間 | 1,914 ms |
| コンパイル使用メモリ | 170,340 KB |
| 実行使用メモリ | 5,248 KB |
| 最終ジャッジ日時 | 2024-10-08 21:59:30 |
| 合計ジャッジ時間 | 2,926 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 25 |
ソースコード
#include <bits/stdc++.h>
int ri() {
int n;
scanf("%d", &n);
return n;
}
int64_t rs64() {
int64_t n;
scanf("%" SCNd64, &n);
return n;
}
#define MOD 1000000007
template<int mod>
struct ModInt{
int x;
ModInt():x(0){}
ModInt(long long y):x(y>=0?y%mod:(mod-(-y)%mod)%mod){}
ModInt &operator+=(const ModInt &p){
if((x+=p.x)>=mod)x-=mod;
return *this;
}
ModInt &operator-=(const ModInt &p){
if((x+=mod-p.x)>=mod)x-=mod;
return *this;
}
ModInt &operator*=(const ModInt &p){
x=(int)(1LL*x*p.x%mod);
return *this;
}
ModInt &operator/=(const ModInt &p){
*this*=p.inverse();
return *this;
}
ModInt &operator^=(long long p){
ModInt res = 1;
for (; p; p >>= 1) {
if (p & 1) res *= *this;
*this *= *this;
}
return *this = res;
}
ModInt operator-()const{return ModInt(-x);}
ModInt operator+(const ModInt &p)const{return ModInt(*this)+=p;}
ModInt operator-(const ModInt &p)const{return ModInt(*this)-=p;}
ModInt operator*(const ModInt &p)const{return ModInt(*this)*=p;}
ModInt operator/(const ModInt &p)const{return ModInt(*this)/=p;}
ModInt operator^(long long p)const{return ModInt(*this)^=p;}
bool operator==(const ModInt &p)const{return x==p.x;}
bool operator!=(const ModInt &p)const{return x!=p.x;}
explicit operator int() const { return x; } // added by QCFium
ModInt operator=(const int p) {x = p; return ModInt(*this);} // added by QCFium
ModInt inverse()const{
int a=x,b=mod,u=1,v=0,t;
while(b>0){
t=a/b;
a-=t*b;
std::swap(a,b);
u-=t*v;
std::swap(u,v);
}
return ModInt(u);
}
friend std::ostream &operator<<(std::ostream &os,const ModInt<mod> &p){
return os<<p.x;
}
friend std::istream &operator>>(std::istream &is,ModInt<mod> &a){
long long x;
is>>x;
a=ModInt<mod>(x);
return (is);
}
};
typedef ModInt<MOD> mint;
struct MComb {
std::vector<mint> fact;
std::vector<mint> inversed;
MComb(int n) { // O(n+log(mod))
fact = std::vector<mint>(n+1,1);
for (int i = 1; i <= n; i++) fact[i] = fact[i-1]*mint(i);
inversed = std::vector<mint>(n+1);
inversed[n] = fact[n] ^ (MOD-2);
for (int i = n - 1; i >= 0; i--) inversed[i]=inversed[i+1]*mint(i+1);
}
mint ncr(int n, int r) {
return (fact[n] * inversed[r] * inversed[n-r]);
}
mint npr(int n, int r) {
return (fact[n] * inversed[n-r]);
}
mint nhr(int n, int r) {
assert(n+r-1 < (int)fact.size());
return ncr(n+r-1, r);
}
};
int main() {
int n = ri(), w = ri();
int64_t k;
std::cin >> k;
int a[n];
for (auto &i : a) i = ri();
mint r1, r2;
{
mint dp[w + 1];
dp[0] = 1;
for (int i = 0; i < w; i++)
for (int j = 0; j < n; j++) if (i + a[j] <= w) dp[i + a[j]] += dp[i];
r1 = dp[w];
}{
mint dp[2 * w + 1];
dp[0] = 1;
for (int i = 0; i < 2 * w; i++) {
if (i == w) continue;
for (int j = 0; j < n; j++) if (i + a[j] <= 2 * w) dp[i + a[j]] += dp[i];
}
r2 = dp[2 * w];
}
mint mat[2][2] = {{0, r2}, {1, r1}};
mint cur[2] = {1, r1};
for (; k; k >>= 1) {
if (k & 1) {
mint next[2];
for (int i = 0; i < 2; i++) for (int j = 0; j < 2; j++) next[j] += cur[i] * mat[i][j];
cur[0] = next[0];
cur[1] = next[1];
}
mint next[2][2] = {
{mat[0][0] * mat[0][0] + mat[0][1] * mat[1][0], mat[0][0] * mat[0][1] + mat[0][1] * mat[1][1]},
{mat[1][0] * mat[0][0] + mat[1][1] * mat[1][0], mat[1][0] * mat[0][1] + mat[1][1] * mat[1][1]},
};
mat[0][0] = next[0][0];
mat[0][1] = next[0][1];
mat[1][0] = next[1][0];
mat[1][1] = next[1][1];
}
std::cout << cur[0] << std::endl;
return 0;
}
QCFium