結果

問題 No.1221 木 *= 3
ユーザー ゆにぽけ
提出日時 2023-10-09 13:25:58
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 82 ms / 2,000 ms
コード長 3,263 bytes
コンパイル時間 1,155 ms
コンパイル使用メモリ 124,500 KB
最終ジャッジ日時 2025-02-17 06:26:25
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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ファイルパターン 結果
sample AC * 4
other AC * 18
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<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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