結果

問題 No.1221 木 *= 3
ユーザー ゆにぽけゆにぽけ
提出日時 2023-10-09 13:25:58
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 79 ms / 2,000 ms
コード長 3,263 bytes
コンパイル時間 1,281 ms
コンパイル使用メモリ 129,152 KB
実行使用メモリ 21,700 KB
最終ジャッジ日時 2024-07-26 18:30:59
合計ジャッジ時間 4,617 ms
ジャッジサーバーID
(参考情報)
judge2 / judge3
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 3 ms
7,752 KB
testcase_01 AC 3 ms
7,620 KB
testcase_02 AC 3 ms
8,004 KB
testcase_03 AC 3 ms
7,624 KB
testcase_04 AC 4 ms
7,880 KB
testcase_05 AC 3 ms
7,496 KB
testcase_06 AC 3 ms
7,624 KB
testcase_07 AC 79 ms
21,700 KB
testcase_08 AC 79 ms
21,192 KB
testcase_09 AC 77 ms
21,448 KB
testcase_10 AC 79 ms
21,316 KB
testcase_11 AC 79 ms
21,440 KB
testcase_12 AC 65 ms
12,528 KB
testcase_13 AC 64 ms
12,480 KB
testcase_14 AC 68 ms
12,656 KB
testcase_15 AC 67 ms
12,628 KB
testcase_16 AC 66 ms
12,676 KB
testcase_17 AC 73 ms
12,484 KB
testcase_18 AC 70 ms
12,484 KB
testcase_19 AC 72 ms
12,488 KB
testcase_20 AC 73 ms
12,608 KB
testcase_21 AC 71 ms
12,612 KB
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ソースコード

diff #

#include<iostream>
#include<vector>
#include<algorithm>
#include<cstring>
#include<cassert>
#include<cmath>
#include<ctime>
#include<iomanip>
#include<numeric>
#include<stack>
#include<queue>
#include<map>
#include<unordered_map>
#include<set>
#include<unordered_set>
#include<bitset>
#include<random>
using namespace std;
template<int m> struct modint
{
	private:
	unsigned int value;
	static constexpr int mod() {return m;}

	public:
	constexpr modint(const long long x = 0) noexcept
	{
		long long y = x;
		if(y < 0 || y >= mod())
		{
			y %= mod();
			if(y < 0) y += mod();
		}
		value = (unsigned int)y;
	}
	constexpr unsigned int val() noexcept {return value;}
	constexpr modint &operator+=(const modint &other) noexcept
	{
		value += other.value;
		if(value >= mod()) value -= mod();
		return *this;
	}
	constexpr modint &operator-=(const modint &other) noexcept
	{
		unsigned int x = value;
		if(x < other.value) x += mod();
		x -= other.value;
		value = x;
		return *this;
	}
	constexpr modint &operator*=(const modint &other) noexcept
	{
		unsigned long long x = value;
		x *= other.value;
		value = (unsigned int) (x % mod());
		return *this;
	}
	constexpr modint &operator/=(const modint &other) noexcept
	{
		return *this *= other.inverse();
	}
	constexpr modint inverse() const noexcept
	{
		assert(value);
		long long a = value,b = mod(),x = 1,y = 0;
		while(b)
		{
			long long q = a/b;
			a -= q*b; swap(a,b);
			x -= q*y; swap(x,y);
		}
		return modint(x);
	}
	constexpr modint power(long long N) const noexcept
	{
		assert(N >= 0);
		modint p = *this,ret = 1;
		while(N)
		{
			if(N & 1) ret *= p;
			p *= p;
			N >>= 1;
		}
		return ret;
	}
	constexpr modint operator+() {return *this;}
	constexpr modint operator-() {return modint() - *this;}
	constexpr modint &operator++(int) noexcept {return *this += 1;}
	constexpr modint &operator--(int) noexcept {return *this -= 1;}
	friend modint operator+(const modint& lhs, const modint& rhs) {return modint(lhs) += rhs;}
	friend modint operator-(const modint& lhs, const modint& rhs) {return modint(lhs) -= rhs;}
	friend modint operator*(const modint& lhs, const modint& rhs) {return modint(lhs) *= rhs;}
	friend modint operator/(const modint& lhs, const modint& rhs) {return modint(lhs) /= rhs;}
	friend ostream &operator<<(ostream &os,const modint &x) {return os << x.value;}
};
//using mint = modint<998244353>;
using mint = modint<1000000007>;
int N,A[1 << 17],B[1 << 17];
vector<int> G[1 << 17];
long long dp[1 << 17][2];

void dfs(int u,int p)
{
	long long ep[2][2];
	int cur = 0;
	ep[cur][0] = A[u],ep[cur][1] = 0;
	for(int v:G[u]) if(v != p)
	{
		dfs(v,u);
		int nxt = 1-cur;
		ep[nxt][0] = ep[nxt][1] = -(long long)1e18;
		ep[nxt][0] = max(dp[v][0],dp[v][1]) + ep[cur][0];
		ep[nxt][1] = max(dp[v][0],dp[v][1] + B[u]+B[v]) + ep[cur][1];
		cur = nxt;
	}
	dp[u][0] = ep[cur][0];
	dp[u][1] = ep[cur][1];
}
void solve()
{
	cin >> N;
	for(int i = 0;i < N;i++) cin >> A[i];
	for(int i = 0;i < N;i++) cin >> B[i];
	for(int i = 1;i < N;i++)
	{
		int u,v;
		cin >> u >> v;
		u--; v--;
		G[u].push_back(v);
		G[v].push_back(u);
	}

	dfs(0,-1);
	cout << max(dp[0][0],dp[0][1]) << endl;
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int tt = 1;
	//cin >> tt;
	while(tt--) solve();
}
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