結果
問題 | No.196 典型DP (1) |
ユーザー | kei |
提出日時 | 2018-09-18 22:58:10 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
TLE
|
実行時間 | - |
コード長 | 2,979 bytes |
コンパイル時間 | 1,721 ms |
コンパイル使用メモリ | 177,108 KB |
実行使用メモリ | 34,816 KB |
最終ジャッジ日時 | 2024-07-18 08:07:28 |
合計ジャッジ時間 | 6,130 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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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 | 2 ms
10,624 KB |
testcase_01 | AC | 1 ms
5,376 KB |
testcase_02 | AC | 1 ms
5,376 KB |
testcase_03 | AC | 1 ms
5,376 KB |
testcase_04 | AC | 1 ms
5,376 KB |
testcase_05 | AC | 1 ms
5,376 KB |
testcase_06 | AC | 2 ms
5,376 KB |
testcase_07 | AC | 2 ms
5,376 KB |
testcase_08 | AC | 1 ms
5,376 KB |
testcase_09 | AC | 2 ms
5,376 KB |
testcase_10 | AC | 1 ms
5,376 KB |
testcase_11 | AC | 2 ms
5,376 KB |
testcase_12 | AC | 2 ms
5,376 KB |
testcase_13 | AC | 2 ms
5,376 KB |
testcase_14 | AC | 2 ms
5,376 KB |
testcase_15 | AC | 3 ms
5,376 KB |
testcase_16 | AC | 7 ms
5,376 KB |
testcase_17 | AC | 9 ms
5,376 KB |
testcase_18 | AC | 22 ms
5,376 KB |
testcase_19 | AC | 29 ms
5,376 KB |
testcase_20 | AC | 18 ms
5,376 KB |
testcase_21 | AC | 30 ms
5,376 KB |
testcase_22 | AC | 21 ms
5,376 KB |
testcase_23 | AC | 108 ms
17,032 KB |
testcase_24 | AC | 86 ms
11,872 KB |
testcase_25 | AC | 92 ms
11,500 KB |
testcase_26 | AC | 42 ms
34,816 KB |
testcase_27 | AC | 42 ms
34,816 KB |
testcase_28 | AC | 43 ms
34,688 KB |
testcase_29 | AC | 45 ms
34,688 KB |
testcase_30 | AC | 44 ms
34,816 KB |
testcase_31 | TLE | - |
testcase_32 | -- | - |
testcase_33 | -- | - |
testcase_34 | -- | - |
testcase_35 | -- | - |
testcase_36 | -- | - |
testcase_37 | -- | - |
testcase_38 | -- | - |
testcase_39 | -- | - |
testcase_40 | -- | - |
testcase_41 | -- | - |
testcase_42 | -- | - |
testcase_43 | -- | - |
ソースコード
#include "bits/stdc++.h" using namespace std; typedef long long ll; typedef pair<int, int> pii; typedef pair<ll, ll> pll; const int INF = 1e9; const ll LINF = 1e18; template<class S,class T> ostream& operator << (ostream& out,const pair<S,T>& o){ out << "(" << o.first << "," << o.second << ")"; return out; } template<class T> ostream& operator << (ostream& out,const vector<T> V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " ";} return out; } template<class T> ostream& operator << (ostream& out,const vector<vector<T> > Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out << Mat[i];} return out; } template<class S,class T> ostream& operator << (ostream& out,const map<S,T> mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out << it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; } /* <url:https://yukicoder.me/problems/no/196> 問題文============================================================ ================================================================= 解説============================================================= ================================================================ */ ll N,K; vector<vector<ll>> G; vector<ll> child; const ll MOD = 1e9+7; ll child_init(ll n,ll pre){ ll now = 1; for(ll next:G[n]){ if(pre == next) continue; now += child_init(next, n); } return child[n] = now; } vector<pll> rec(ll n,ll pre){ vector<ll> dp(N+1); dp[0] = 1; for(ll next:G[n]){ if(pre == next) continue; auto T = rec(next,n); for(ll i = N; i >= 0; i--){ if(dp[i] == 0) continue; for(auto p:T){ if(p.first == 0) continue; (dp[i+p.first] += dp[i]*p.second)%=MOD; } } } dp[child[n]] = 1; vector<pll> ret; for(int i = 0; i <= N;i++){ if(dp[i] == 0) continue; ret.push_back({i,dp[i]}); } return ret; } vector<ll> rec2(ll n,ll pre){ vector<ll> dp(N+1); dp[0] = 1; for(ll next:G[n]){ if(pre == next) continue; auto T = rec2(next,n); for(ll i = child[n]; i >= 0; i--){ if(dp[i] == 0) continue; for(ll j = 1; j <= child[n];j++){ if(T[j] == 0) continue; (dp[i+j] += dp[i]*T[j])%=MOD; } } } dp[child[n]] = 1; return dp; } ll solve(){ cin >> N >> K; G.resize(N); child.resize(N); for(int i = 0; i < N-1;i++){ ll a,b; cin >> a >> b; G[a].push_back(b); G[b].push_back(a); } child_init(0, -1); ll res = 0; // auto T = rec(0,-1); // for(auto p :T){ // if(p.first==K) res = p.second; // } auto T2 = rec2(0,-1); res = T2[K]; return res; } int main(void) { cin.tie(0); ios_base::sync_with_stdio(false); cout << solve() << endl; return 0; }