結果
| 問題 |
No.1112 冥界の音楽
|
| コンテスト | |
| ユーザー |
koyopro
|
| 提出日時 | 2020-07-10 23:25:03 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 1,539 ms / 2,000 ms |
| コード長 | 4,402 bytes |
| コンパイル時間 | 2,354 ms |
| コンパイル使用メモリ | 201,696 KB |
| 最終ジャッジ日時 | 2025-01-11 19:16:01 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 34 |
ソースコード
#include "bits/stdc++.h"
using namespace std;
#define int long long
#define FOR(i, a, b) for(int i=(a);i<(b);i++)
#define RFOR(i, a, b) for(int i=(b-1);i>=(a);i--)
#define REP(i, n) for(int i=0; i<(n); i++)
#define RREP(i, n) for(int i=(n-1); i>=0; i--)
#define REP1(i, n) for(int i=1; i<=(n); i++)
#define RREP1(i, n) for(int i=(n); i>=1; i--)
#define ALL(a) (a).begin(),(a).end()
#define UNIQUE_SORT(l) sort(ALL(l)); l.erase(unique(ALL(l)), l.end());
#define CONTAIN(a, b) find(ALL(a), (b)) != (a).end()
#define out(...) printf(__VA_ARGS__)
#if DEBUG
#define debug(...) printf(__VA_ARGS__)
#else
#define debug(...) /* ... */
#endif
template<class T>bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template<class T>bool chmin(T &a,const T &b){if(b<a){a=b;return true;}return false;}
void solve();
signed main()
{
#if DEBUG
std::ifstream in("input.txt");
std::cin.rdbuf(in.rdbuf());
#endif
cin.tie(0);
ios::sync_with_stdio(false);
solve();
return 0;
}
/*================================*/
#if DEBUG
#define SIZE 10
#else
#define SIZE 333
#endif
template<int MOD> struct ModInt {
static const int Mod = MOD; unsigned x; ModInt() : x(0) { }
ModInt(signed sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
ModInt(signed long long sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
int get() const { return (int)x; }
ModInt &operator+=(ModInt that) { if ((x += that.x) >= MOD) x -= MOD; return *this; }
ModInt &operator-=(ModInt that) { if ((x += MOD - that.x) >= MOD) x -= MOD; return *this; }
ModInt &operator*=(ModInt that) { x = (unsigned long long)x * that.x % 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 inverse() const { long long a = x, b = MOD, u = 1, v = 0;
while (b) { long long t = a / b; a -= t * b; std::swap(a, b); u -= t * v; std::swap(u, v); }
return ModInt(u); }
bool operator==(ModInt that) const { return x == that.x; }
bool operator!=(ModInt that) const { return x != that.x; }
ModInt operator-() const { ModInt t; t.x = x == 0 ? 0 : Mod - x; return t; }
};
template<int MOD> ostream& operator<<(ostream& st, const ModInt<MOD> a) { st << a.get(); return st; };
template<int MOD> ModInt<MOD> operator^(ModInt<MOD> a, unsigned long long k) {
ModInt<MOD> r = 1; while (k) { if (k & 1) r *= a; a *= a; k >>= 1; } return r; }
typedef ModInt<1000000007> mint;
int N,M,K;
int A[SIZE];
// i番目,3つ前,2つ前,1つ前→組み合わせ数
int DP[2][6][6][6];
struct Tup {
int a,b,c;
};
// 3*(2^i)番目,前のTupのindex,次のTupのindex→組み合わせ数
mint DP2[62][SIZE][SIZE];
int MOD=1e9+7;
int E[6][6][6];
void solve() {
cin>>K>>M>>N;
int p,q,r;
vector<Tup> tups;
vector<int> s0;
REP(i,M) {
cin>>p>>q>>r;
--p;--q;--r;
if (!p) s0.push_back(tups.size());
tups.push_back({p,q,r});
E[p][q][r]=1;
}
int size = tups.size();
REP(i,size)REP(j,size) {
auto [a,b,c] = tups[i];
auto [d,e,f] = tups[j];
if (E[b][c][d] && E[c][d][e]) {
DP2[0][i][j] += 1;
}
}
N -= 3;
int T = N/3;
// i番目,-3,-2,-1
vector<int> ans(size), tmp(size);
for (int i:s0) {
ans[i] = 1;
}
REP(i,61) {
REP(j,size)REP(k,size)REP(l,size) {
DP2[i+1][j][l] += DP2[i][j][k]*DP2[i][k][l];
}
if (T & (1LL<<i)) {
fill(ALL(tmp), 0);
REP(j,size)REP(k,size) {
(tmp[k] += ans[j] * DP2[i][j][k].get()) %= MOD;
}
REP(j,size) ans[j]=tmp[j];
}
}
REP(i,size) {
auto [a,b,c] = tups[i];
DP[0][a][b][c] = ans[i];
}
int m = N%3;
REP(i,m) {
int from = i%2, to = (i+1)%2;
REP(j,6)REP(k,6)REP(l,6) DP[to][j][k][l] = 0;
REP(j,6)REP(k,6)REP(l,6)REP(n,6) {
if (E[k][l][n]) (DP[to][k][l][n] += DP[from][j][k][l]) %= MOD;
}
}
int ret = 0;
REP(j,6)REP(k,6) (ret += DP[m%2][j][k][0]) %= MOD;
cout << ret << endl;
}
koyopro