結果
問題 | No.196 典型DP (1) |
ユーザー | sune232002 |
提出日時 | 2015-04-27 01:18:14 |
言語 | C++11 (gcc 11.4.0) |
結果 |
AC
|
実行時間 | 20 ms / 2,000 ms |
コード長 | 4,210 bytes |
コンパイル時間 | 1,315 ms |
コンパイル使用メモリ | 162,280 KB |
実行使用メモリ | 19,432 KB |
最終ジャッジ日時 | 2024-07-05 03:27:58 |
合計ジャッジ時間 | 3,202 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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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 | 9 ms
19,032 KB |
testcase_01 | AC | 10 ms
19,072 KB |
testcase_02 | AC | 9 ms
19,024 KB |
testcase_03 | AC | 9 ms
19,072 KB |
testcase_04 | AC | 8 ms
18,996 KB |
testcase_05 | AC | 8 ms
18,944 KB |
testcase_06 | AC | 8 ms
19,072 KB |
testcase_07 | AC | 8 ms
19,012 KB |
testcase_08 | AC | 8 ms
19,200 KB |
testcase_09 | AC | 9 ms
19,160 KB |
testcase_10 | AC | 7 ms
18,984 KB |
testcase_11 | AC | 9 ms
19,128 KB |
testcase_12 | AC | 10 ms
19,156 KB |
testcase_13 | AC | 9 ms
19,072 KB |
testcase_14 | AC | 8 ms
19,192 KB |
testcase_15 | AC | 9 ms
19,072 KB |
testcase_16 | AC | 10 ms
19,024 KB |
testcase_17 | AC | 10 ms
19,200 KB |
testcase_18 | AC | 12 ms
18,944 KB |
testcase_19 | AC | 11 ms
19,072 KB |
testcase_20 | AC | 13 ms
19,072 KB |
testcase_21 | AC | 13 ms
19,140 KB |
testcase_22 | AC | 14 ms
19,200 KB |
testcase_23 | AC | 15 ms
19,072 KB |
testcase_24 | AC | 14 ms
19,072 KB |
testcase_25 | AC | 14 ms
19,120 KB |
testcase_26 | AC | 20 ms
19,328 KB |
testcase_27 | AC | 20 ms
19,236 KB |
testcase_28 | AC | 18 ms
19,432 KB |
testcase_29 | AC | 18 ms
19,360 KB |
testcase_30 | AC | 18 ms
19,200 KB |
testcase_31 | AC | 17 ms
19,200 KB |
testcase_32 | AC | 17 ms
19,200 KB |
testcase_33 | AC | 14 ms
19,120 KB |
testcase_34 | AC | 16 ms
18,944 KB |
testcase_35 | AC | 15 ms
19,200 KB |
testcase_36 | AC | 15 ms
19,072 KB |
testcase_37 | AC | 13 ms
19,072 KB |
testcase_38 | AC | 15 ms
19,072 KB |
testcase_39 | AC | 14 ms
19,200 KB |
testcase_40 | AC | 15 ms
19,072 KB |
testcase_41 | AC | 9 ms
19,184 KB |
testcase_42 | AC | 8 ms
19,188 KB |
testcase_43 | AC | 8 ms
19,008 KB |
ソースコード
#include <bits/stdc++.h> using namespace std; #define REP(i,n) for(int i=0;i<(int)(n);++i) #define REPR(i,n) for (int i=(int)(n)-1;i>=0;--i) #define FOR(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();++i) #define ALL(c) (c).begin(), (c).end() #define valid(y,x,h,w) (0<=y&&y<h&&0<=x&&x<w) #define tpl(...) make_tuple(__VA_ARGS__) const int INF = 0x3f3f3f3f; const double EPS = 1e-8; const double PI = acos(-1); const int dy[] = {-1,0,1,0}; const int dx[] = {0,1,0,-1}; typedef long long ll; typedef pair<int,int> pii; 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; } template<typename Ch,typename Tr,typename C,typename=decltype(begin(C()))>basic_ostream<Ch,Tr>& operator<<(basic_ostream<Ch,Tr>&os, const C& c){os<<'[';for(auto i=begin(c);i!=end(c);++i)os<<(i==begin(c)?"":" ")<<*i;return os<<']';} template<class S,class T>ostream&operator<<(ostream &o,const pair<S,T>&t){return o<<'('<<t.first<<','<<t.second<<')';} template<int N,class Tp>void output(ostream&,const Tp&){} template<int N,class Tp,class,class ...Ts>void output(ostream &o,const Tp&t){if(N)o<<',';o<<get<N>(t);output<N+1,Tp,Ts...>(o,t);} template<class ...Ts>ostream&operator<<(ostream&o,const tuple<Ts...>&t){o<<'(';output<0,tuple<Ts...>,Ts...>(o,t);return o<<')';} template<class T>void output(T t,char z=10){if(t<0)t=-t,putchar(45);int c[20]; int k=0;while(t)c[k++]=t%10,t/=10;for(k||(c[k++]=0);k;)putchar(c[--k]^48);putchar(z);} template<class T>void outputs(T t){output(t);} template<class S,class ...T>void outputs(S a,T...t){output(a,32);outputs(t...);} template<class T>void output(T *a,int n){REP(i,n)cout<<a[i]<<(i!=n-1?',':'\n');} template<class T>void output(T *a,int n,int m){REP(i,n)output(a[i],m);} template<class T>bool input(T &t){int n=1,c;for(t=0;!isdigit(c=getchar())&&~c&&c-45;); if(!~c)return 0;for(c-45&&(n=0,t=c^48);isdigit(c=getchar());)t=10*t+c-48;t=n?-t:t;return 1;} template<class S,class ...T>bool input(S&a,T&...t){input(a);return input(t...);} template<class T>bool inputs(T *a, int n) { REP(i,n) if(!input(a[i])) return 0; return 1;} template<int MOD> struct ModInt { int x; ModInt() : x(0) {} ModInt(ll s) { if ((x = s % MOD) < 0) x += MOD; } ModInt operator+=(ModInt rhs) { if ((x+=rhs.x) >= MOD) x -= MOD; return *this; } ModInt operator-=(ModInt rhs) { if ((x-=rhs.x) < 0) x += MOD; return *this; } ModInt operator*=(ModInt rhs) { x = (ll)x*rhs.x % MOD; return *this; } ModInt operator+(ModInt rhs) const { return ModInt(*this) += rhs; } ModInt operator-(ModInt rhs) const { return ModInt(*this) -= rhs; } ModInt operator*(ModInt rhs) const { return ModInt(*this) *= rhs; } ModInt operator/=(ModInt rhs) { static const ll inv2 = ModInt(2).inv().x; // 2で割るのは特別に保存してみる ll i = (rhs.x == 2 ? inv2 : rhs.inv().x); x = x*i%MOD; return *this; } ModInt operator/(ModInt rhs) const { return ModInt(*this) /= rhs; } ModInt inv() { return pow(MOD-2); } ModInt pow(ll n) const { ModInt r = 1, t = x; for (;n;n>>=1,t*=t) if (n&1) r *= t; return r; } static ModInt strnum(const string &n) {ModInt a = 0; for (char c:n) a = a*10+c-'0'; return a;} friend ostream& operator<<(ostream &os, const ModInt rhs){ return os << rhs.x; } }; typedef ModInt<int(1e9+7)> mint; vector<int> g[2000]; mint dp[2000][2001]; int num[2000]; void solve(int v, int p) { num[v] = 1; for (int u : g[v]) { if (u == p) continue; solve(u,v); } int cnt = 0; dp[v][0] = 1; for (int u : g[v]) { if (u == p) continue; for (int i=num[v]; i>=0; --i) { for (int j=num[u]; j>=1; --j) { dp[v][i+j] += dp[v][i] * dp[u][j]; } } num[v] += num[u]; cnt++; } dp[v][num[v]] = 1; // cout << "!" << v << " " << dp2[1][0] << endl; // REP(i,num[v]+1) { // cout << dp[v][i] << " "; // } // cout << endl; } int main() { int n,k; while(input(n,k)) { REP(i,n) g[i].clear(); memset(dp,0,sizeof(dp)); REP(i,n-1) { int a,b; input(a,b); g[a].push_back(b); g[b].push_back(a); } solve(0,-1); cout << dp[0][k] << endl; } }