結果

問題 No.417 チューリップバブル
ユーザー kei
提出日時 2018-12-05 23:36:10
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 62 ms / 2,000 ms
コード長 2,446 bytes
コンパイル時間 2,103 ms
コンパイル使用メモリ 175,196 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-07-21 20:47:33
合計ジャッジ時間 3,604 ms
ジャッジサーバーID
(参考情報)
judge2 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
other AC * 40
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 #
プレゼンテーションモードにする

#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;
inline ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }
inline ll lcm(ll a, ll b) { return a / gcd(a, b)*b; }
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/417>
============================================================
=================================================================
=============================================================
================================================================
*/
int dp[200][2001];
void rec(int n,int pre,vector<vector<pii>>& G,vector<int>& U){
dp[n][0] = U[n];
for(auto p:G[n]){
int next,cost; tie(next,cost) = p;
if(next == pre) continue;
rec(next,n,G,U);
for(int i = 2000; i >= 0; i--){
if(dp[n][i] == -1) continue;
for(int j = 2000; j >= 0; j--){
if(dp[next][j] == -1) continue;
if(i+j+cost > 2000) continue;
dp[n][i+j+cost] = max(dp[n][i+j+cost],dp[n][i]+dp[next][j]);
}
}
}
}
ll solve(){
ll res = 0;
int N,M; cin >> N >> M;
vector<int> U(N); for(auto& in:U) cin >> in;
vector<vector<pii>> G(N);
for(int i = 0; i < N-1;i++){
int A,B,C; cin >> A >> B >> C;
G[A].push_back(pii(B,C));
G[B].push_back(pii(A,C));
}
fill(*dp,*dp+200*2001,-1);
rec(0,-1,G,U);
for(int i = 0; i*2 <= M;i++) res = max(res,(ll)dp[0][i]);
return res;
}
int main(void) {
cin.tie(0); ios_base::sync_with_stdio(false);
cout << solve() << endl;
return 0;
}
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