結果

問題 No.1227 I hate ThREE
ユーザー ThistleThistle
提出日時 2020-09-11 22:59:42
言語 C++14
(gcc 13.2.0 + boost 1.83.0)
結果
AC  
実行時間 284 ms / 2,000 ms
コード長 7,945 bytes
コンパイル時間 2,891 ms
コンパイル使用メモリ 131,584 KB
実行使用メモリ 106,048 KB
最終ジャッジ日時 2023-08-30 14:44:03
合計ジャッジ時間 10,772 ms
ジャッジサーバーID
(参考情報)
judge15 / judge11
このコードへのチャレンジ
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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 86 ms
97,928 KB
testcase_01 AC 61 ms
98,124 KB
testcase_02 AC 60 ms
97,880 KB
testcase_03 AC 68 ms
101,872 KB
testcase_04 AC 69 ms
102,036 KB
testcase_05 AC 77 ms
102,056 KB
testcase_06 AC 61 ms
98,112 KB
testcase_07 AC 61 ms
97,868 KB
testcase_08 AC 79 ms
99,916 KB
testcase_09 AC 75 ms
99,544 KB
testcase_10 AC 69 ms
99,220 KB
testcase_11 AC 264 ms
105,576 KB
testcase_12 AC 249 ms
105,644 KB
testcase_13 AC 50 ms
98,608 KB
testcase_14 AC 64 ms
99,588 KB
testcase_15 AC 75 ms
100,252 KB
testcase_16 AC 126 ms
102,392 KB
testcase_17 AC 88 ms
101,008 KB
testcase_18 AC 170 ms
103,808 KB
testcase_19 AC 138 ms
102,696 KB
testcase_20 AC 188 ms
103,944 KB
testcase_21 AC 49 ms
98,180 KB
testcase_22 AC 144 ms
103,024 KB
testcase_23 AC 271 ms
105,712 KB
testcase_24 AC 279 ms
105,768 KB
testcase_25 AC 278 ms
106,048 KB
testcase_26 AC 266 ms
105,568 KB
testcase_27 AC 283 ms
105,688 KB
testcase_28 AC 283 ms
105,728 KB
testcase_29 AC 282 ms
105,668 KB
testcase_30 AC 265 ms
105,548 KB
testcase_31 AC 268 ms
105,664 KB
testcase_32 AC 284 ms
105,840 KB
testcase_33 AC 266 ms
105,384 KB
testcase_34 AC 282 ms
105,772 KB
testcase_35 AC 263 ms
105,576 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

#pragma GCC target ("avx")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define _USE_MATH_DEFINES
#include<iostream>
#include<string>
#include<queue>
#include<cmath>
#include<map>
#include<set>
#include<list>
#include<iomanip>
#include<vector>
#include<random>
#include<functional>
#include<algorithm>
#include<stack>
#include<cstdio>
#include<cstring>
#include<bitset>
#include<unordered_map>
#include<climits>
#include<fstream>
#include<complex>
#include<time.h>
#include<cassert>
#include<functional>
#include<numeric>
#include<tuple>
using namespace std;
using ll = long long;
using ld = long double;
using H = pair<ll, ll>;
using P = pair<ll, H>;
using vi = vector<ll>;
#define all(a) (a).begin(),(a).end()
#define fs first
#define sc second
#define xx first
#define yy second.first
#define zz second.second
#define Q(i,j,k) mkp(i,mkp(j,k))
#define rng(i,s,n) for(ll i = (s) ; i < (n) ; i++)
#define rep(i,n) rng(i, 0, (n))
#define mkp make_pair
#define vec vector
#define pb emplace_back
#define siz(a) (int)(a).size()
#define crdcomp(b) sort(all((b)));(b).erase(unique(all((b))),(b).end())
#define getidx(b,i) (lower_bound(all(b),(i))-(b).begin())
#define ssp(i,n) (i==(ll)(n)-1?"\n":" ")
#define ctoi(c) (int)(c-'0')
#define itoc(c) (char)(c+'0')
#define cyes printf("Yes\n")
#define cno printf("No\n")
#define cdf(n) for(int quetimes_=(n);quetimes_>0;quetimes_--)
#define gcj printf("Case #%lld: ",qq123_+1)
#define readv(a,n) a.resize(n,0);rep(i,(n)) a[i]=read()
#define found(a,x) (a.find(x)!=a.end())
constexpr ll mod = (ll)1e9 + 7;
constexpr ll Mod = 998244353;
constexpr ld EPS = 1e-10;
constexpr ll inf = (ll)3 * 1e18;
constexpr int Inf = (ll)15 * 1e8;
constexpr int dx[] = { -1,1,0,0 }, dy[] = { 0,0,-1,1 };
template<class T>bool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; }
ll read() { ll u, k = scanf("%lld", &u); return u; }
string reads() { string s; cin >> s; return s; }
H readh(short g = 0) { H u; int k = scanf("%lld %lld", &u.fs, &u.sc); if (g == 1) u.fs--, u.sc--; if (g == 2) u.fs--; return u; }
bool ina(H t, int h, int w) { return 0 <= t.fs && t.fs < h && 0 <= t.sc && t.sc < w; }
bool ina(int t, int l, int r) { return l <= t && t < r; }
ll gcd(ll i, ll j) { return j ? gcd(j, i % j) : i; }
ll popcount(ll x) {
    int sum = 0; for (int i = 0; i < 60; i++)if ((1ll << i) & x) sum++;
    return sum;
}
template<typename T>
class csum {
    vec<T> v;
public:
    csum(vec<T>& a) :v(a) { build(); }
    csum() {}
    void init(vec<T>& a) { v = a; build(); }
    void build() {
        for (int i = 1; i < v.size(); i++) v[i] += v[i - 1];
    }
    //[l,r]
    T a(int l, int r) {
        if (r < l) return 0;
        return v[r] - (l == 0 ? 0 : v[l - 1]);
    }
    //[l,r)
    T b(int l, int r) {
        return a(l, r - 1);
    }
    T a(pair<int, int>t) {
        return a(t.first, t.second);
    }
    T b(pair<int, int>t) {
        return b(t.first, t.second);
    }
};
class mint {
public:ll v;
      mint(ll v = 0) { s(v % mod + mod); }
      constexpr static int mod = (ll)1e9 + 7;
      constexpr static int fn_ = (ll)2e6 + 5;
      static mint fact[fn_], comp[fn_];
      mint pow(int x) const {
          mint b(v), c(1);
          while (x) {
              if (x & 1) c *= b;
              b *= b;
              x >>= 1;
          }
          return c;
      }
      inline mint& s(int vv) {
          v = vv < mod ? vv : vv - mod;
          return *this;
      }
      inline mint inv()const { return pow(mod - 2); }
      inline mint operator-()const { return mint() - *this; }
      inline mint& operator+=(const mint b) { return s(v + b.v); }
      inline mint& operator-=(const mint b) { return s(v + mod - b.v); }
      inline mint& operator*=(const mint b) { v = v * b.v % mod; return *this; }
      inline mint& operator/=(const mint b) { v = v * b.inv().v % mod; return *this; }
      inline mint operator+(const mint b) const { return mint(v) += b; }
      inline mint operator-(const mint b) const { return mint(v) -= b; }
      inline mint operator*(const mint b) const { return mint(v) *= b; }
      inline mint operator/(const mint b) const { return mint(v) /= b; }
      friend ostream& operator<<(ostream& os, const mint& m) {
          return os << m.v;
      }
      friend istream& operator>>(istream& is, mint& m) {
          int x; is >> x; m = mint(x);
          return is;
      }
      bool operator<(const mint& r)const { return v < r.v; }
      bool operator>(const mint& r)const { return v > r.v; }
      bool operator<=(const mint& r)const { return v <= r.v; }
      bool operator>=(const mint& r)const { return v >= r.v; }
      bool operator==(const mint& r)const { return v == r.v; }
      bool operator!=(const mint& r)const { return v != r.v; }
      explicit operator bool()const { return v; }
      explicit operator int()const { return v; }
      mint comb(mint k) {
          if (k > * this) return mint();
          if (!fact[0]) combinit();
          if (v >= fn_) {
              if (k > * this - k) k = *this - k;
              mint tmp(1);
              for (int i = v; i >= v - k.v + 1; i--) tmp *= mint(i);
              return tmp * comp[k.v];
          }
          return fact[v] * comp[k.v] * comp[v - k.v];
      }//nCk
      mint perm(mint k) {
          if (k > * this) return mint();
          if (!fact[0]) combinit();
          if (v >= fn_) {
              mint tmp(1);
              for (int i = v; i >= v - k.v + 1; i--) tmp *= mint(i);
              return tmp;
          }
          return fact[v] * comp[v - k.v];
      }//nPk
      static void combinit() {
          fact[0] = 1;
          for (int i = 1; i < fn_; i++) fact[i] = fact[i - 1] * mint(i);
          comp[fn_ - 1] = fact[fn_ - 1].inv();
          for (int i = fn_ - 2; i >= 0; i--) comp[i] = comp[i + 1] * mint(i + 1);
      }
}; mint mint::fact[fn_], mint::comp[fn_];
//--------------------------------------------------------------
//--------------------------------------------------------------

int n, c;
vec<int>e[2000];
mint dp[1010][8000];
bool flag[1010][8000];

mint solve(int x, int p, int d) {
    int k = d;
    if (k > 3 * n) k = c - d + 3 * n + 1;
    if (flag[x][k]) return dp[x][k];

    mint sum = 1;
    for (auto g : e[x]) {
        if (g == p) continue;
        mint res = 0;
        if (d == 0) {
            res+= solve(g, x, 0) * 2;
        }
        else {
            if (d + 3 > 3 * n && d + 3 < c - 3 * n) {
                res+= solve(g, x, 0);
            }
            else if (d + 3 <= c) {
                res+= solve(g, x, d + 3);
            }


            if (d - 3 > 3 * n && d - 3 < c - 3 * n) {
                res+= solve(g, x, 0);
            }
            else if (d - 3 >= 1) {
                res+= solve(g, x, d - 3);
            }
        }
        sum *= res;
    }
    flag[x][k] = 1;
    return dp[x][k] = sum;
}

mint solve2(int x, int p, int d) {
    if (flag[x][d]) return dp[x][d];

    mint sum = 1;
    for (auto g : e[x]) {
        if (g == p) continue;
        mint res = 0;
        if (d + 3 <= c) res+= solve(g, x, d + 3);
        if (d - 3 > 0)  res+= solve(g, x, d - 3);
        sum *= res;
    }
    flag[x][d] = 1;
    return dp[x][d] = sum;
}


signed main() {
    cin >> n >> c;
    rep(i, n - 1) {
        int u, v; cin >> u >> v;
        u--; v--;
        e[u].pb(v); e[v].pb(u);
    }
    
    if (6 * n >= c) {
        mint sum = 0;
        rng(i, 1, c + 1) {
            sum += solve(0, -1, i);
        }
        cout << sum << endl;
    }
    else {
        mint sum = 0;
        for (int i = 1; i <= 3 * n; i++) sum += solve(0, -1, i);
        for (int i = c - 3 * n + 1; i <= c; i++) sum += solve(0, -1, i);
        sum += solve(0, -1, 0) * (c - 6 * n);
        cout << sum << endl;
    }
}
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