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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 |
---|---|---|---|---|---|---|---|---|---|
#391127 | #7103. Red Black Tree | KKT89 | TL | 0ms | 3656kb | C++17 | 3.5kb | 2024-04-16 13:48:19 | 2024-04-16 13:48:19 |
Judging History
answer
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) { return (ull)rng() % B; }
struct heavy_light_decomposition {
int n;
vector<vector<int>> G;
vector<int> par, sz, in, nxt;
heavy_light_decomposition(int n) : n(n), G(n), par(n), sz(n, 1), in(n), nxt(n) {}
void add_edge(int x, int y) {
G[x].push_back(y);
G[y].push_back(x);
}
void build() {
auto dfs1 = [&](auto self, int s, int p) -> void {
for (int i = 0; i < (int)G[s].size(); ++i) {
int t = G[s][i];
if (t == p) {
swap(G[s][i--], G[s].back());
G[s].pop_back();
} else {
par[t] = s;
self(self, t, s);
sz[s] += sz[t];
if (sz[t] > sz[G[s][0]]) {
swap(G[s][0], G[s][i]);
}
}
}
};
dfs1(dfs1, 0, -1);
int id = 0;
auto dfs2 = [&](auto self, int s) -> void {
in[s] = id++;
for (int t : G[s]) {
if (t == G[s][0]) {
nxt[t] = nxt[s];
} else {
nxt[t] = t;
}
self(self, t);
}
};
dfs2(dfs2, 0);
}
int lca(int s, int t) {
while (1) {
if (in[s] > in[t]) swap(s, t);
if (nxt[s] == nxt[t]) return s;
t = par[nxt[t]];
}
}
};
void slv() {
int n, m, q;
cin >> n >> m >> q;
vector<bool> red(n);
for (int i = 0; i < m; i++) {
int x;
cin >> x;
red[x - 1] = true;
}
map<pair<int, int>, int> edge;
heavy_light_decomposition hld(n);
for (int i = 0; i < n - 1; i++) {
int x, y, z;
cin >> x >> y >> z;
x -= 1, y -= 1;
edge[{x, y}] = edge[{y, x}] = z;
hld.add_edge(x, y);
}
hld.build();
vector<ll> cost(n), dist(n);
auto dfs = [&](auto dfs, int s, ll sum, ll c) -> void {
if (red[s]) c = 0;
dist[s] = sum;
cost[s] = c;
for (int t : hld.G[s]) {
dfs(dfs, t, sum + edge[{s, t}], c + edge[{s, t}]);
}
};
dfs(dfs, 0, 0, 0);
while (q--) {
int k;
cin >> k;
vector<int> v(k);
ll L = -1, R = 0;
for (int i = 0; i < k; i++) {
cin >> v[i];
v[i] -= 1;
R = max(R, cost[v[i]]);
}
while (R - L > 1) {
ll mid = (L + R) / 2;
int id = -1;
for (int i : v) {
if (cost[i] <= mid) continue;
if (id == -1) id = i;
id = hld.lca(id, i);
}
bool ok = true;
if (id != -1) {
for (int i : v) {
if (cost[i] <= mid) continue;
if (dist[i] - dist[id] > mid) {
ok = false;
break;
}
}
}
if (ok) R = mid;
else L = mid;
}
cout << R << "\n";
}
}
int main() {
cin.tie(nullptr);
ios::sync_with_stdio(false);
int q;
cin >> q;
while (q--) {
slv();
}
}
詳細信息
Test #1:
score: 100
Accepted
time: 0ms
memory: 3656kb
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
Time Limit Exceeded
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 319801028 319801028 255904892 317070839 1265145897 1265145897 1072765445 667742619 455103436 285643094 285643094 285643094 317919339 0 785245841 691421476 605409472 479058444 371688030 303203698 493383271 919185207 910180170 919185207 121535083 181713164 181713164 181713164 181...