結果

問題 No.898 tri-βutree
ユーザー ningenMeningenMe
提出日時 2019-10-04 21:57:58
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 907 ms / 4,000 ms
コード長 8,044 bytes
コンパイル時間 2,802 ms
コンパイル使用メモリ 189,620 KB
実行使用メモリ 44,148 KB
最終ジャッジ日時 2024-11-08 22:08:44
合計ジャッジ時間 16,604 ms
ジャッジサーバーID
(参考情報)
judge3 / judge1
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 * 1
other AC * 21
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;
using ll = long long;
using ull = unsigned long long;
#define REP(i,n) for(long long i = 0; i < (n); i++)
#define FOR(i, m, n) for(long long i = (m);i < (n); ++i)
#define ALL(obj) (obj).begin(),(obj).end()
#define SPEED cin.tie(0);ios::sync_with_stdio(false);
template<class T> using V = vector<T>;
template<class T, class U> using P = pair<T, U>;
template<class T> using PQ = priority_queue<T>;
template<class T> using PQR = priority_queue<T,vector<T>,greater<T>>;
constexpr long long MOD = (long long)1e9 + 7;
constexpr long long MOD2 = 998244353;
constexpr long long HIGHINF = (long long)1e18;
constexpr long long LOWINF = (long long)1e15;
constexpr long double PI = 3.1415926535897932384626433;
template <class T> vector<T> multivector(size_t N,T init){return vector<T>(N,init);}
template <class... T> auto multivector(size_t N,T... t){return vector<decltype(multivector(t...))>(N,multivector(t...));}
template <class T> void corner(bool flg, T hoge) {if (flg) {cout << hoge << endl; exit(0);}}
template <class T, class U>ostream &operator<<(ostream &o, const map<T, U>&obj) {o << "{"; for (auto &x : obj) o << " {" << x.first << " : " << x
    .second << "}" << ","; o << " }"; return o;}
template <class T>ostream &operator<<(ostream &o, const set<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr != obj
    .begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const multiset<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr !
    = obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const vector<T>&obj) {o << "{"; for (int i = 0; i < (int)obj.size(); ++i)o << (i > 0 ? ", " : "")
    << obj[i]; o << "}"; return o;}
template <class T, class U>ostream &operator<<(ostream &o, const pair<T, U>&obj) {o << "{" << obj.first << ", " << obj.second << "}"; return o;}
template <template <class tmp> class T, class U> ostream &operator<<(ostream &o, const T<U> &obj) {o << "{"; for (auto itr = obj.begin(); itr != obj
    .end(); ++itr)o << (itr != obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
void print(void) {cout << endl;}
template <class Head> void print(Head&& head) {cout << head;print();}
template <class Head, class... Tail> void print(Head&& head, Tail&&... tail) {cout << head << " ";print(forward<Tail>(tail)...);}
template <class T> void chmax(T& a, const T b){a=max(a,b);}
template <class T> void chmin(T& a, const T b){a=min(a,b);}
void YN(bool flg) {cout << (flg ? "YES" : "NO") << endl;}
void Yn(bool flg) {cout << (flg ? "Yes" : "No") << endl;}
void yn(bool flg) {cout << (flg ? "yes" : "no") << endl;}
template<class T = int> class Tree {
public:
int N;
int is_weighted;
int MAX_bit;
int idx;
vector<vector<int>> edge;
vector<vector<T>> weight;
vector<int> depth;
vector<int> order;
vector<T> dist;
vector<int> parent;
vector<T> parent_dist;
vector<vector<int>> child;
vector<vector<T>> child_dist;
vector<vector<int>> ancestor;
vector<vector<int>> descendant;
vector<int> euler_tour;
vector<T> euler_tour_dist;
vector<int> idxl;
vector<int> idxr;
Tree(const int N, const int is_weighted = 0, const int MAX_bit = 20) :
N(N),
is_weighted(is_weighted),
MAX_bit(MAX_bit),
edge(N),
depth(N),
order(N)
{
if(is_weighted) weight.resize(N);
if(is_weighted) dist.resize(N);
}
//O(1) anytime
void make_edge(const int& from, const int& to, const T& w = 0) {
edge[from].push_back(to);
if(is_weighted) weight[from].push_back(w);
}
//O(N) anytime
void make_depth(const int root) {
depth[root] = 0;
if(is_weighted) dist[root] = 0;
idx = 0;
dfs1(root);
order[idx++] = root;
}
//for make_depth
void dfs1(int from, int prev = -1){
for(int i = 0; i < edge[from].size(); ++i){
int to = edge[from][i];
if(to==prev) continue;
depth[to] = depth[from] + 1;
if(is_weighted) dist[to] = dist[from] + weight[from][i];
dfs1(to,from);
order[idx++] = to;
}
}
//O(N) anytime
int diameter(void){
make_depth(0);
int tmp = max_element(depth.begin(), depth.end()) - depth.begin();
make_depth(tmp);
return *max_element(depth.begin(), depth.end());
}
//O(N) after make_depth
void make_parent(void) {
parent.resize(N);
iota(parent.begin(),parent.end(),0);
for (int i = 0; i < N; ++i) for (auto j : edge[i]) if (depth[i] > depth[j]) parent[i] = j;
if(is_weighted) {
parent_dist.resize(N);
for (int i = 0; i < N; ++i) for (int j = 0; j < edge[i].size(); ++j) if (depth[i] > depth[edge[i][j]]) parent_dist[i] = weight[i][j];
}
}
//O(N) after make_depth
void make_child(void) {
child.resize(N);
for (int i = 0; i < N; ++i) for (auto j : edge[i]) if (depth[i] < depth[j]) child[i].push_back(j);
if(is_weighted) {
child_dist.resize(N);
for (int i = 0; i < N; ++i) for (int j = 0; j < edge[i].size(); ++j) if (depth[i] < depth[edge[i][j]]) child_dist[i].push_back
                (weight[i][j]);
}
}
//O(NlogN) after make_depth
void make_ancestor(void) {
ancestor.resize(N,vector<int>(MAX_bit));
for (int i = 0; i < N; ++i) ancestor[i][0] = i;
for (int i = 0; i < N; ++i) for (auto j : edge[i]) if (depth[i] > depth[j]) ancestor[i][0] = j;
for (int bit = 1; bit < MAX_bit; ++bit) for (int i = 0; i < N; ++i) ancestor[i][bit] = ancestor[ancestor[i][bit - 1]][bit - 1];
}
//O(N^2) after make_depth
void make_descendant(void) {
descendant.resize(N);
for (int i = 0; i < N; ++i) descendant[i].push_back(i);
for (int i = 0; i < N; ++i) for (auto j : edge[order[i]]) if (depth[order[i]] < depth[j]) for(auto k: descendant[j]) descendant[order[i]]
            .push_back(k);
}
//O(logN) after make_ancestor
int LCA(int l, int r) {
if (depth[l] < depth[r]) swap(l, r);
int diff = depth[l] - depth[r];
for (int bit = 0; bit < MAX_bit; ++bit) if (diff & (1 << bit)) l = ancestor[l][bit];
if(l==r) return l;
for (int bit = MAX_bit - 1; 0 <= bit; --bit) if(ancestor[l][bit]!=ancestor[r][bit]) l = ancestor[l][bit], r = ancestor[r][bit];
return ancestor[l][0];
}
//O(N) after make_child and make_parent
void make_euler_tour(void){
dfs2(order[N-1]);
idxl.resize(N);
idxr.resize(N);
for(int i = 0; i < euler_tour.size(); ++i) idxr[euler_tour[i]] = i;
for(int i = euler_tour.size()-1; 0 <= i; --i) idxl[euler_tour[i]] = i;
return;
}
//for make_euler_tour
void dfs2(int from, int prev = -1){
euler_tour.push_back(from);
if(is_weighted) euler_tour_dist.push_back(parent_dist[from]);
for(int i = 0; i < child[from].size(); ++i){
int to = child[from][i];
dfs2(to,from);
euler_tour.push_back(from);
if(is_weighted) euler_tour_dist.push_back(-child_dist[from][i]);
}
}
};
//depth,dist
//https://atcoder.jp/contests/abc126/tasks/abc126_d
//LCA
//https://atcoder.jp/contests/abc014/tasks/abc014_4
//child
//https://atcoder.jp/contests/abc133/tasks/abc133_e
int main() {
int N;
cin >> N;
Tree<ll> tree(N,1);
for(int i = 0; i < N-1; ++i) {
int u,v,w;
cin >> u >> v >> w;
tree.make_edge(u,v,w);
tree.make_edge(v,u,w);
}
tree.make_depth(0);
tree.make_child();
tree.make_ancestor();
int Q; cin >> Q;
while(Q--) {
ll sum = HIGHINF;
vector<int> v(3);
for(int i = 0; i < 3; ++i) cin >> v[i];
for(int i = 0; i < 3; ++i) {
for(int j = 0; j < 3; ++j) {
for(int k = 0; k < 3; ++k) {
if(i == j || j == k || k == i) continue;
ll cnt = 0;
int a = tree.LCA(v[i],v[j]);
cnt += (tree.dist[v[i]]+tree.dist[v[j]]-2*tree.dist[a]);
int b = tree.LCA(a,v[k]);
cnt += (tree.dist[v[k]]+tree.dist[a]-2*tree.dist[b]);
chmin(sum,cnt);
}
}
}
cout << sum << endl;
}
return 0;
}
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