結果

問題 No.898 tri-βutree
ユーザー maimai
提出日時 2019-10-04 22:29:47
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 134 ms / 4,000 ms
コード長 9,225 bytes
コンパイル時間 3,321 ms
コンパイル使用メモリ 229,680 KB
最終ジャッジ日時 2025-01-07 20:39:30
ジャッジサーバーID
(参考情報)
judge4 / judge4
このコードへのチャレンジ
(要ログイン)
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

#pragma GCC optimize ("O3")
#include "bits/stdc++.h"
using namespace std;
using ll = long long int;
#define debugos cout
#define debug(v) {printf("L%d %s > ",__LINE__,#v);debugos<<(v)<<endl;}
#define debugv(v) {printf("L%d %s > ",__LINE__,#v);for(auto e:(v)){debugos<<e<<" ";}debugos<<endl;}
#define debuga(m,w) {printf("L%d %s > ",__LINE__,#m);for(int x=0;x<(w);x++){debugos<<(m)[x]<<" ";}debugos<<endl;}
#define debugaa(m,h,w) {printf("L%d %s >\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){debugos<<(m)[y][x]<<" ";}debugos<<endl;}}
#define all(v) (v).begin(),(v).end()
#define repeat(cnt,l) for(auto cnt=remove_reference<decltype(l)>::type();(cnt)<(l);++(cnt))
#define rrepeat(cnt,l) for(auto cnt=(l)-1;0<=(cnt);--(cnt))
#define iterate(cnt,b,e) for(auto cnt=(b);(cnt)!=(e);++(cnt))
#define diterate(cnt,b,e) for(auto cnt=(b);(cnt)!=(e);--(cnt))
const ll MD = 1000000007ll; const long double PI = 3.1415926535897932384626433832795L;
inline void assert_call(bool assertion, function<void()> f) { if (!assertion) { cerr << "assertion fault:" << endl; f(); abort(); } }
template<typename T1, typename T2> inline ostream& operator <<(ostream &o, const pair<T1, T2> p) { o << '(' << p.first << ':' << p.second << ')';
    return o; }
template<typename Vec> inline ostream& _ostream_vecprint(ostream& os, const Vec& a) {
os << '['; for (const auto& e : a) os << ' ' << e << ' '; os << ']'; return os; }
template<typename T> inline ostream& operator<<(ostream& o, const vector<T>& v) { return _ostream_vecprint(o, v); }
template<typename T, size_t S> inline ostream& operator<<(ostream& o, const array<T, S>& v) { return _ostream_vecprint(o, v); }
template<typename T> inline T& chmax(T& to, const T& val) { return to = max(to, val); }
template<typename T> inline T& chmin(T& to, const T& val) { return to = min(to, val); }
void bye(string s, int code = 0) { cout << s << endl; exit(code); }
mt19937_64 randdev(8901016);
template<typename T, typename Random = decltype(randdev), typename enable_if<is_integral<T>::value>::type* = nullptr>
inline T rand(T l, T h, Random& rand = randdev) { return uniform_int_distribution<T>(l, h)(rand); }
template<typename T, typename Random = decltype(randdev), typename enable_if<is_floating_point<T>::value>::type* = nullptr>
inline T rand(T l, T h, Random& rand = randdev) { return uniform_real_distribution<T>(l, h)(rand); }
#if defined(_WIN32) || defined(_WIN64)
#define getc_x _getc_nolock
#define putc_x _putc_nolock
#elif defined(__GNUC__)
#define getc_x getc_unlocked
#define putc_x putc_unlocked
#else
#define getc_x getc
#define putc_x putc
#endif
#define isvisiblechar(c) (0x21<=(c)&&(c)<=0x7E)
class MaiScanner {
FILE* fp_;
public:
inline MaiScanner(FILE* fp):fp_(fp){}
template<typename T> void input_integer(T& var) noexcept {
var = 0; T sign = 1;
int cc = getc_x(fp_);
for (; cc < '0' || '9' < cc; cc = getc_x(fp_))
if (cc == '-') sign = -1;
for (; '0' <= cc && cc <= '9'; cc = getc_x(fp_))
var = (var << 3) + (var << 1) + cc - '0';
var = var * sign;
}
inline int c() noexcept { return getc_x(fp_); }
inline MaiScanner& operator>>(int& var) noexcept { input_integer<int>(var); return *this; }
inline MaiScanner& operator>>(long long& var) noexcept { input_integer<long long>(var); return *this; }
inline MaiScanner& operator>>(string& var) {
int cc = getc_x(fp_);
for (; !isvisiblechar(cc); cc = getc_x(fp_));
for (; isvisiblechar(cc); cc = getc_x(fp_))
var.push_back(cc);
return *this;
}
template<typename IT> inline void in(IT begin, IT end) { for (auto it = begin; it != end; ++it) *this >> *it; }
};
class MaiPrinter {
FILE* fp_;
public:
inline MaiPrinter(FILE* fp):fp_(fp){}
template<typename T>
void output_integer(T var) noexcept {
if (var == 0) { putc_x('0', fp_); return; }
if (var < 0)
putc_x('-', fp_),
var = -var;
char stack[32]; int stack_p = 0;
while (var)
stack[stack_p++] = '0' + (var % 10),
var /= 10;
while (stack_p)
putc_x(stack[--stack_p], fp_);
}
inline MaiPrinter& operator<<(char c) noexcept { putc_x(c, fp_); return *this; }
inline MaiPrinter& operator<<(int var) noexcept { output_integer<int>(var); return *this; }
inline MaiPrinter& operator<<(long long var) noexcept { output_integer<long long>(var); return *this; }
inline MaiPrinter& operator<<(char* str_p) noexcept { while (*str_p) putc_x(*(str_p++), fp_); return *this; }
inline MaiPrinter& operator<<(const string& str) {
const char* p = str.c_str();
const char* l = p + str.size();
while (p < l) putc_x(*p++, fp_);
return *this;
}
template<typename IT> void join(IT begin, IT end, char sep = ' ') { for (bool b = 0; begin != end; ++begin, b = 1) b ? *this << sep << *begin :
        *this << *begin; }
};
MaiScanner scanner(stdin);
MaiPrinter printer(stdout);
class Graph {
public:
int n;
vector<vector<int>> vertex_to;
Graph(int n = 1) : n(n), vertex_to(n) {}
inline int size() const { return n; }
void resize(int _n) { vertex_to.resize(n = _n); }
void connect(int from, int to) {
vertex_to[(int)from].emplace_back(to);
vertex_to[(int)to].emplace_back(from);
}
};
// Edge
class GraphE {
public:
using W_T = int;
struct Edge {
int u, v;
W_T value;
Edge(int from = 0, int to = 0, W_T value = 0) : u(from), v(to), value(value) {}
inline int to(int _v) const { return _v == v ? u : v; }
};
size_t n;
vector<vector<int>> vertex_to;
vector<Edge> edges;
GraphE(int n = 1) : n(n), vertex_to(n) {}
inline size_t size() const noexcept { return n; }
void resize(size_t _n) { vertex_to.resize(n = _n); }
void connect(int from, int to, W_T val = 0) {
vertex_to[(size_t)from].push_back((int)edges.size());
vertex_to[(size_t)to].push_back((int)edges.size());
edges.emplace_back(from, to, val);
}
void connect(vector<Edge>&& es) {
edges = move(es);
for (int i = 0; (size_t)i < edges.size(); ++i) {
vertex_to[edges[i].u].push_back(i);
vertex_to[edges[i].v].push_back(i);
}
}
};
template <typename T>
class SparseTable {
public:
int size;
vector<int> log2;
vector<T> data;
vector<T> dp;
SparseTable(int size) : size(size), log2(size + 1), data(size) {
// for fast calculate log2
for (int i = 2; i <= size; ++i) {
log2[i] = log2[i >> 1] + 1;
}
dp.resize(size * (log2[size] + 1));
}
inline T& operator[](size_t i) { return data[i]; }
inline T operator[](size_t i) const { return data[i]; }
void build() {
int l, i, f, b;
for (i = 0; i < size; i++) {
dp[i] = i;
}
for (l = 1; (1 << l) <= size; l++) {
for (i = 0; i + (1 << l) <= size; i++) {
f = dp[i + size * (l - 1)];
b = dp[(i + (1 << (l - 1))) + size * (l - 1)];
dp[i + size * l] = (data[f] <= data[b]) ? f : b; // minimum
}
}
}
// range [l,r)
int getminrangeIdx(int l, int r) const {
int lg = log2[r - l];
int i1 = dp[l + size * lg];
int i2 = dp[r - (1 << lg) + size * lg];
return (data[i1] <= data[i2]) ? i1 : i2; // minimum
}
};
class LCATable {
vector<int> visited_;
vector<int> visited_inv_;
SparseTable<int> depth_;
public:
LCATable(const Graph& g, int root = 0) : visited_(g.n * 2), visited_inv_(g.n), depth_(g.n * 2) {
build(g, root);
}
int _tour_dfs(const Graph& g, int idx, int from = -1, int step = 0, int dep = 0) {
depth_[step] = dep;
visited_inv_[idx] = step;
visited_[step] = idx;
for (int to : g.vertex_to[idx]) {
if (to == from)
continue;
step = _tour_dfs(g, to, idx, ++step, dep + 1);
depth_[step] = dep;
visited_[step] = idx;
}
return ++step;
}
inline void build(const Graph& g, int root = 0) {
_tour_dfs(g, root);
depth_.build();
}
inline int operator()(int u, int v) {
return visited_inv_[u] <= visited_inv_[v]
? visited_[depth_.getminrangeIdx(visited_inv_[u], visited_inv_[v])]
:
operator()(v, u);
}
};
//
int N, M;
Graph graph;
GraphE graphe;
ll tourist[100010];
//
void tour(int v, int from = -1){
for (auto ei : graphe.vertex_to[v]) {
int u = graphe.edges[ei].to(v);
if (u == from) continue;
tourist[u] += tourist[v] + graphe.edges[ei].value;
tour(u, v);
}
}
int main() {
scanner >> N;
M = N - 1;
graph.resize(N);
graphe.resize(N);
repeat(i, M) {
int a, b, c;
scanner >> a >> b >> c;
graph.connect(a, b);
graphe.connect(a, b, c);
}
LCATable lca(graph, 0);
tour(0);
int nquery; scanner >> nquery;
auto dist = [&lca](int u, int v) -> ll{
int w = lca(u, v);
return tourist[u] + tourist[v] - tourist[w]*2;
};
repeat(i, nquery) {
int x,y,z; scanner >> x >> y >> z;
ll d = (dist(x, y) + dist(y, z) + dist(z, x)) / 2;
printer << d << '\n';
}
return 0;
}
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