結果
| 問題 |
No.386 貪欲な領主
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2022-06-28 23:33:48 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 340 ms / 2,000 ms |
| コード長 | 4,612 bytes |
| コンパイル時間 | 5,143 ms |
| コンパイル使用メモリ | 256,200 KB |
| 最終ジャッジ日時 | 2025-01-30 01:38:00 |
|
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 16 |
ソースコード
#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
typedef long double ld;
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define REPR(i, n) for (int i = n - 1; i >= 0; --i)
#define FOR(i, m, n) for (int i = m; i < n; ++i)
#define FORR(i, m, n) for (int i = m; i >= n; --i)
#define ALL(v) (v).begin(),(v).end()
#define ALLR(v) (v).rbegin(),(v).rend()
#define fi first
#define se second
#define PB push_back
#define EB emplace_back
template<typename T> using PQ = priority_queue<T>;
template<typename T> using QP = priority_queue<T,vector<T>,greater<T>>;
template<typename T>void debug(const T &v,ll h,ll w){for(ll i=0;i<h;i++){for(ll j=0;j<w;j++)cerr<<v[i][j]<<" \n"[j==w-1];}};
template<typename T>void debug(const T &v,ll n){for(ll i=0;i<n;i++)cerr<<v[i]<<" \n"[i==n-1];};
template<typename T>void debug(const vector<T>&v){debug(v,v.size());}
template<typename T>void debug(const vector<vector<T>>&v){for(auto &vv:v)debug(vv,vv.size());}
template<typename T>void debug(stack<T> st){while(!st.empty()){cerr<<st.top()<<" ";st.pop();}cerr<<endl;}
template<typename T>void debug(queue<T> st){while(!st.empty()){cerr<<st.front()<<" ";st.pop();}cerr<<endl;}
template<typename T>void debug(deque<T> st){while(!st.empty()){cerr<<st.front()<<" ";st.pop_front();}cerr<<endl;}
template<typename T>void debug(PQ<T> st){while(!st.empty()){cerr<<st.top()<<" ";st.pop();}cerr<<endl;}
template<typename T>void debug(QP<T> st){while(!st.empty()){cerr<<st.top()<<" ";st.pop();}cerr<<endl;}
template<typename T>void debug(const set<T>&v){for(auto z:v)cerr<<z<<" ";cerr<<endl;}
template<typename T>void debug(const multiset<T>&v){for(auto z:v)cerr<<z<<" ";cerr<<endl;}
template<typename T,size_t size>void debug(const array<T, size> &a){for(auto z:a)cerr<<z<<" ";cerr<<endl;}
template<typename T,typename V>void debug(const map<T,V>&v){for(auto z:v)cerr<<"["<<z.first<<"]="<<z.second<<",";cerr<<endl;}
void foo() {cerr << endl;}
template <class Head, class... Tail>void foo(Head&& head, Tail&&... tail){cerr << head << " ";foo(move(tail)...);}
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
int popcount(ll x){return __builtin_popcountll(x);};
int poplow(ll x){return __builtin_ctzll(x);};
int pophigh(ll x){return 63 - __builtin_clzll(x);};
const ll INF=1LL<<60;
const int inf=(1<<30)-1;
// const int mod=1e9+7;
const int mod=998244353;
int dx[8]={1,0,-1,0,-1,-1,1,1};
int dy[8]={0,1,0,-1,-1,1,-1,1};
using mint=modint998244353;
// using mint=modint1000000007;
// LCA https://ei1333.github.io/luzhiled/snippets/tree/doubling-lowest-common-ancestor.html
template< typename G >
struct DoublingLowestCommonAncestor {
const int LOG;
vector< int > dep;
const G &g;
vector< vector< int > > table;
DoublingLowestCommonAncestor(const G &g) : g(g), dep(g.size()), LOG(32 - __builtin_clz(g.size())) {
table.assign(LOG, vector< int >(g.size(), -1));
}
void dfs(int idx, int par, int d) {
table[0][idx] = par;
dep[idx] = d;
for(auto &to : g[idx]) {
if(to != par) dfs(to, idx, d + 1);
}
}
void build() {
dfs(0, -1, 0);
for(int k = 0; k + 1 < LOG; k++) {
for(int i = 0; i < table[k].size(); i++) {
if(table[k][i] == -1) table[k + 1][i] = -1;
else table[k + 1][i] = table[k][table[k][i]];
}
}
}
int query(int u, int v) {
if(dep[u] > dep[v]) swap(u, v);
for(int i = LOG - 1; i >= 0; i--) {
if(((dep[v] - dep[u]) >> i) & 1) v = table[i][v];
}
if(u == v) return u;
for(int i = LOG - 1; i >= 0; i--) {
if(table[i][u] != table[i][v]) {
u = table[i][u];
v = table[i][v];
}
}
return table[0][u];
}
};
int main(){
cin.tie(0);
ios::sync_with_stdio(false);
int n;cin >> n;
vector<vector<int>> e(n);
REP(i,n-1){
int a,b;cin >> a >> b;
e[a].PB(b);
e[b].PB(a);
}
DoublingLowestCommonAncestor<vector<vector<int>>> lca(e);
lca.build();
vector<int> u(n);
REP(i,n) cin >> u[i];
int m;cin >> m;
vector<ll> x(n);
ll res=0;
auto dfs=[&](auto &&dfs,int cur,int pre=-1)->void{
res+=u[cur];
x[cur]=res;
for(auto to:e[cur]){
if(to==pre) continue;
dfs(dfs,to,cur);
}
res-=u[cur];
};
dfs(dfs,0);
ll ans=0;
while(m--){
int a,b,c;cin >> a >> b >> c;
int t=lca.query(a,b);
ans+=(x[a]+x[b]-x[t]*2+u[t])*c;
}
cout << ans << endl;
}