結果
| 問題 |
No.417 チューリップバブル
|
| コンテスト | |
| ユーザー |
penguinshunya
|
| 提出日時 | 2019-07-03 22:06:12 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 3,563 bytes |
| コンパイル時間 | 2,103 ms |
| コンパイル使用メモリ | 206,888 KB |
| 最終ジャッジ日時 | 2025-01-07 05:52:44 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 38 WA * 2 |
ソースコード
#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < int(n); i++)
#define rrep(i, n) for (int i = int(n) - 1; i >= 0; i--)
#define reps(i, n) for (int i = 1; i <= int(n); i++)
#define rreps(i, n) for (int i = int(n); i >= 1; i--)
#define repc(i, n) for (int i = 0; i <= int(n); i++)
#define rrepc(i, n) for (int i = int(n); i >= 0; i--)
#define repi(i, a, b) for (int i = int(a); i < int(b); i++)
#define repic(i, a, b) for (int i = int(a); i <= int(b); i++)
#define each(x, y) for (auto &x : y)
#define all(a) (a).begin(), (a).end()
#define bit(b) (1ll << (b))
using namespace std;
using i32 = int;
using i64 = long long;
using u64 = unsigned long long;
using f80 = long double;
using vi32 = vector<i32>;
using vi64 = vector<i64>;
using vu64 = vector<u64>;
using vf80 = vector<f80>;
using vstr = vector<string>;
inline void yes() { cout << "Yes" << '\n'; exit(0); }
inline void no() { cout << "No" << '\n'; exit(0); }
inline i64 gcd(i64 a, i64 b) { if (min(a, b) == 0) return max(a, b); if (a % b == 0) return b; return gcd(b, a % b); }
inline i64 lcm(i64 a, i64 b) { return a / gcd(a, b) * b; }
inline u64 xorshift() { static u64 x = 88172645463325252ull; x = x ^ (x << 7); return x = x ^ (x >> 9); }
void solve(); int main() { ios::sync_with_stdio(0); cin.tie(0); cout << fixed << setprecision(16); solve(); return 0; }
template <typename T> class pqasc : public priority_queue<T, vector<T>, greater<T>> {};
template <typename T> class pqdesc : public priority_queue<T, vector<T>, less<T>> {};
template <typename T> inline void amax(T &x, T y) { if (x < y) x = y; }
template <typename T> inline void amin(T &x, T y) { if (x > y) x = y; }
template <typename T> inline T power(T x, i64 n, T e = 1) { T r = e; while (n > 0) { if (n & 1) r *= x; x *= x; n >>= 1; } return r; }
template <typename T> istream& operator>>(istream &is, vector<T> &v) { each(x, v) is >> x; return is; }
template <typename T> ostream& operator<<(ostream &os, vector<T> &v) { rep(i, v.size()) { if (i) os << ' '; os << v[i]; } return os; }
template <typename T, typename S> istream& operator>>(istream &is, pair<T, S> &p) { is >> p.first >> p.second; return is; }
template <typename T, typename S> ostream& operator<<(ostream &os, pair<T, S> &p) { os << p.first << ' ' << p.second; return os; }
template <typename T>
struct WeightedGraph {
struct Edge {
int to;
T cost;
};
vector<vector<Edge>> edges;
int n;
WeightedGraph(int n) : n(n) {
edges = vector<vector<Edge>>(n);
}
void add_edge(int from, int to, T cost = 0) {
edges[from].push_back((Edge) { to, cost });
}
vector<Edge>& operator[](int x) {
return edges[x];
}
};
void solve() {
int N, M; cin >> N >> M;
vi32 money(N); cin >> money;
auto graph = WeightedGraph<i64>(N);
rep(i, N - 1) {
int a, b, c; cin >> a >> b >> c;
graph.add_edge(a, b, c);
graph.add_edge(b, a, c);
}
vector<vi64> dp(N, vi64(M + 1, -1e18));
function<void(int v, int p)> dfs = [&](int v, int p) {
dp[v][0] = 0;
each(e, graph[v]) {
if (e.to == p) continue;
dfs(e.to, v);
rrepc(i, M) {
if (dp[e.to][i] < 0) continue;
if (i + e.cost * 2 > M) continue;
dp[e.to][i + e.cost * 2] = dp[e.to][i] + money[e.to];
dp[e.to][i] = -1e18;
}
rrepc(i, M) rrepc(j, M) {
if (dp[v][i] < 0 || dp[e.to][j] < 0) continue;
if (i + j > M) continue;
amax(dp[v][i + j], dp[v][i] + dp[e.to][j]);
}
}
};
dfs(0, -1);
i64 ans = 0;
repc(i, M) amax(ans, dp[0][i] + money[0]);
cout << ans << '\n';
}
penguinshunya