結果
| 問題 |
No.898 tri-βutree
|
| コンテスト | |
| ユーザー |
renjyaku_int
|
| 提出日時 | 2020-03-27 21:56:08 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 200 ms / 4,000 ms |
| コード長 | 4,319 bytes |
| コンパイル時間 | 1,952 ms |
| コンパイル使用メモリ | 186,216 KB |
| 実行使用メモリ | 31,292 KB |
| 最終ジャッジ日時 | 2024-11-08 23:33:36 |
| 合計ジャッジ時間 | 7,074 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 1 |
| other | AC * 21 |
ソースコード
//#include <tourist>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> p;
const int INF = 1e9;
const ll LINF = ll(1e18) + 1;
const int MOD = 1000000007;
const int dx[4] = {0, 1, 0, -1}, dy[4] = {-1, 0, 1, 0};
const int Dx[8] = {0, 1, 1, 1, 0, -1, -1, -1}, Dy[8] = {-1, -1, 0, 1, 1, 1, 0, -1};
#define yes cout << "Yes" << endl
#define YES cout << "YES" << endl
#define no cout << "No" << endl
#define NO cout << "NO" << endl
#define rep(i, n) for (int i = 0; i < n; i++)
#define ALL(v) v.begin(), v.end()
#define debug(v) \
cout << #v << ":"; \
for (auto x : v) \
{ \
cout << x << ' '; \
} \
cout << endl;
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;
}
//cout<<fixed<<setprecision(15);有効数字15桁
//-std=c++14
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }
int n, m;
vector<int> a;
template <typename T>
struct edge
{
int src, to;
T cost;
edge(int to, T cost) : src(-1), to(to), cost(cost) {}
edge(int src, int to, T cost) : src(src), to(to), cost(cost) {}
edge &operator=(const int &x)
{
to = x;
return *this;
}
operator int() const { return to; }
};
template <typename T>
using Edges = vector<edge<T>>;
template <typename T>
using WeightedGraph = vector<Edges<T>>;
using UnWeightedGraph = vector<vector<int>>;
template <typename T>
using Matrix = vector<vector<T>>;
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];
}
};
vector<vector<pair<ll,ll>>> v;
vector<ll> dep;
void dfs(int k,int prev,ll d){
dep[k]=d;
rep(i,v[k].size()){
if(v[k][i].first==prev)continue;
dfs(v[k][i].first,k,d+v[k][i].second);
}
}
int main()
{
cin.tie(0);
ios::sync_with_stdio(false);
cin >> n;
v.resize(n);
UnWeightedGraph g(n);
for (int i = 0; i < n-1; i++)
{
ll temp,temp1,temp2;
cin >> temp>>temp1>>temp2;
v[temp].push_back(make_pair(temp1,temp2));
v[temp1].push_back(make_pair(temp,temp2));
g[temp].push_back(temp1);
g[temp1].push_back(temp);
}
dep.resize(n);
dfs(0,-1,0);
DoublingLowestCommonAncestor<UnWeightedGraph> lca(g);
lca.build();
int q;
cin>>q;
vector<ll> ans;
while(q--){
ll x,y,z;
cin>>x>>y>>z;
ll sum=0;
int temp=lca.query(x,y);
sum+=dep[x]-dep[temp];
sum+=dep[y]-dep[temp];
temp=lca.query(z,y);
sum+=dep[z]-dep[temp];
sum+=dep[y]-dep[temp];
temp=lca.query(x,z);
sum+=dep[x]-dep[temp];
sum+=dep[z]-dep[temp];
ans.push_back(sum/2);
}
rep(i,ans.size())
cout << ans[i] << "\n";
}
renjyaku_int