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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#181021 | #7103. Red Black Tree | ucup-team1344 | WA | 978ms | 24584kb | C++23 | 3.1kb | 2023-09-16 15:11:33 | 2023-09-16 15:11:34 |
Judging History
answer
#include <iostream>
#include <cmath>
#include <vector>
#include <map>
#include <unordered_map>
#include <algorithm>
#include <array>
#include <queue>
#include <memory.h>
#include <tuple>
#include <set>
#include <unordered_set>
#include <bitset>
#include <chrono>
#include <assert.h>
#include <numeric>
#include <ranges>
using namespace std;
using ll=long long;
using ull=unsigned long long;
class Tree{
private:
int n , M ;
void Init(int now , int d , int fa) {
dep[now] = d;
for(int i = 1 ; i < M ; ++i) tr[now][i] = tr[tr[now][i - 1]][i - 1];
for(auto [it , _] : G[now]) {
if(it == fa) continue;
tr[it][0] = now;
dis[it] = dis[now] + _;
Init(it , d + 1 , now);
}
}
public:
vector<int> dep;
vector<vector<pair<int , int> > > G;
vector<vector<int> > tr;
vector<ll> dis;
vector<bool> red;
vector<int> rfa;
Tree(int x) : n(x) , G(x + 1) , M(__lg(x) + 2) , dep(x + 1) {
tr = vector<vector<int> > (n + 1 , vector<int>(M) );
dis.resize(n + 1);
red.resize(n + 1 , false);
rfa.resize(n + 1 , 0);
}
void add(int u , int v , int w = 0) {
G[u].emplace_back(v , w);
G[v].emplace_back(u , w);
}
void LCAInit(int root) {
Init(root , 0 , -1);
}
void dfs(int now , int fa , int re) {
if(!red[now]) rfa[now] = re;
else rfa[now] = now;
for(auto [x , y] : G[now]) {
if(x == fa) continue;
dfs(x , now , (red[now] ? now : re));
}
}
int lca(int u , int v) {
if(dep[u] < dep[v]) std::swap(u , v);
int t = dep[u] - dep[v];
while(t) {
u = tr[u][std::__lg(t)];
t = dep[u] - dep[v];
}
if(u == v) return u;
for(int i = M - 1 ; i >= 0 ; --i) {
if(tr[u][i] != tr[v][i]) {
u = tr[u][i];
v = tr[v][i];
}
}
return tr[u][0];
}
int lca(int u , int v , int rt) {
return lca(u , rt) ^ lca(v , rt) ^ lca(u , v);
}
};
void solve() {
int n , m , q;
cin >> n >> m >> q;
Tree tr(n);
//cerr << "W" << endl;
for(int i = 1 ; i <= m ; ++i) {
int x;
cin >> x;
tr.red[x] = true;
}
for(int i = 1 ; i <= n - 1 ; ++i) {
int u , v , w;
cin >> u >> v >> w;
tr.add(u , v , w);
}
tr.LCAInit(1);
//cerr << "fawfw" << endl;
tr.dfs(1 , -1 , -1);
vector<ll> &dis = tr.dis;
vector<int> &rfa = tr.rfa;
constexpr int MXX = 1e8;
auto path = [&](int now) {
if(now == MXX) return (ll)1e15;
return dis[now] - dis[rfa[now]];
};
while(q--) {
int k;
cin >> k;
vector<int> v(k);
for(auto &it : v) cin >> it;
sort(v.begin() , v.end() , [&](auto a , auto b) {
return path(a) > path(b);
});
ll ans = path(v[0]);
if(k == 1) ans = 0;
else ans = path(v[1]);
int lca = v[0];
v.emplace_back(MXX);
ll mx1 = 0 , mx2 = 0 , mx = 0;
for(int i = 1 ; i < k ; ++i) {
auto it = v[i];
int x = tr.lca(lca , it);
if(tr.dep[x] <= tr.dep[rfa[it]]) {
mx1 = max(mx1 , path(it));
continue;
}
mx = max(dis[lca] - dis[x] + mx , path(v[i + 1]));
ans = min(ans , max(mx , mx1));
lca = x;
}
cout << ans << '\n';
}
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t;
cin >> t;
while(t--) solve();
}
詳細信息
Test #1:
score: 100
Accepted
time: 0ms
memory: 3556kb
input:
2 12 2 4 1 9 1 2 1 2 3 4 3 4 3 3 5 2 2 6 2 6 7 1 6 8 2 2 9 5 9 10 2 9 11 3 1 12 10 3 3 7 8 4 4 5 7 8 4 7 8 10 11 3 4 5 12 3 2 3 1 2 1 2 1 1 3 1 1 1 2 1 2 3 1 2 3
output:
4 5 3 8 0 0 0
result:
ok 7 lines
Test #2:
score: -100
Wrong Answer
time: 978ms
memory: 24584kb
input:
522 26 1 3 1 1 4 276455 18 6 49344056 18 25 58172365 19 9 12014251 2 1 15079181 17 1 50011746 8 9 2413085 23 24 23767115 22 2 26151339 26 21 50183935 17 14 16892041 9 26 53389093 1 20 62299200 24 18 56114328 11 2 50160143 6 26 14430542 16 7 32574577 3 16 59227555 3 15 8795685 4 12 5801074 5 20 57457...
output:
148616264 148616264 0 476331520 476331520 368172715 368172715 1312647007 1312647007 1168076167 667742619 455103436 285643094 285643094 285643094 317919339 0 906088615 691421476 605409472 479058444 371688030 303203698 533172755 1124931652 910180170 919185207 121535083 181713164 181713164 181713164 18...
result:
wrong answer 4th lines differ - expected: '319801028', found: '476331520'