#include <bits/stdc++.h>
using namespace std;
using lint = long long;
using pi = array<int, 2>;
#define sz(v) ((int)(v).size())
#define all(v) (v).begin(), (v).end()
const int MAX = 1000010;
int n, k, q, t, r1, r2;
int a[MAX], b[MAX], c[MAX], d[MAX];
vector<int> ids;
namespace tree1 {
int dep[MAX], logs[2 * MAX], p[MAX];
pair<int, int> st[2 * MAX][20];
vector<int> gph[MAX];
vector<pi> adj[MAX];
vector<pair<int, int>> euler;
int dist[MAX];
bool seen[MAX];
void add(int u, int v) {
gph[u].push_back(v);
gph[v].push_back(u);
}
void dfs(int x, int px) {
if (sz(ids) < k) {
ids.push_back(x);
}
dep[x] = dep[px] + 1;
p[x] = sz(euler);
euler.push_back({dep[x], x});
for (auto& y : gph[x]) {
if (y == px) continue;
dfs(y, x);
euler.push_back({dep[x], x});
}
}
int getlca(int s, int e) {
if (p[s] > p[e]) swap(s, e);
int k = logs[p[e] - p[s] + 1];
return min(st[p[s]][k], st[p[e] - (1 << k) + 1][k]).second;
}
void dfs(int x) {
seen[x] = true;
for (auto& y : adj[x]) {
if (!seen[y[0]] != -1) continue;
dist[y[0]] = dist[x] + y[1];
dfs(y[0]);
}
}
void build() {
for (int i = 0; i < n; i++) dist[i] = -1;
for (int i = 2; i < 2 * MAX; i++)
logs[i] = logs[i >> 1] + 1;
for (int i = 0; i < sz(euler); i++)
st[i][0] = euler[i];
for (int j = 1; j < 20; j++)
for (int i = 0; i + (1 << j) <= sz(euler); i++)
st[i][j] = min(st[i][j - 1], st[i + (1 << (j - 1))][j - 1]);
for (int i = 0; i + 1 < k; i++) {
int x = ids[i];
int y = ids[i + 1];
int z = getlca(ids[i], ids[i + 1]);
adj[x].push_back({z, -a[i]});
adj[z].push_back({x, a[i]});
adj[y].push_back({z, -b[i]});
adj[z].push_back({y, b[i]});
}
dfs(r1);
}
int query(int x, int y) {
return dist[x] + dist[y] - 2 * dist[getlca(x, y)];
}
};
namespace tree2 {
int dep[MAX], p[MAX], logs[2 * MAX];
vector<pair<int, int>> euler;
pair<int, int> st[2 * MAX][20];
vector<int> gph[MAX];
vector<pi> adj[MAX];
int dist[MAX];
bool seen[MAX];
void add(int u, int v) {
gph[u].push_back(v);
gph[v].push_back(u);
}
void dfs(int x, int px) {
dep[x] = dep[px] + 1;
p[x] = sz(euler);
euler.push_back({dep[x], x});
for (auto& y : gph[x]) {
if (y == px) continue;
dfs(y, x);
euler.push_back({dep[x], x});
}
}
int getlca(int s, int e) {
if (p[s] > p[e]) swap(s, e);
int k = logs[p[e] - p[s] + 1];
return min(st[p[s]][k], st[p[e] - (1 << k) + 1][k]).second;
}
void order() {
sort(all(ids), [&](int i, int j) { return p[i] < p[j]; });
}
void dfs(int x) {
seen[x] = true;
for (auto& y : adj[x]) {
if (seen[y[0]]) continue;
dist[y[0]] = dist[x] + y[1];
dfs(y[0]);
}
}
void build() {
for (int i = 2; i < 2 * MAX; i++)
logs[i] = logs[i >> 1] + 1;
for (int i = 0; i < sz(euler); i++)
st[i][0] = euler[i];
for (int j = 1; j < 20; j++)
for (int i = 0; i + (1 << j) <= sz(euler); i++)
st[i][j] = min(st[i][j - 1], st[i + (1 << (j - 1))][j - 1]);
for (int i = 0; i + 1 < k; i++) {
int x = ids[i];
int y = ids[i + 1];
int z = getlca(ids[i], ids[i + 1]);
adj[x].push_back({z, -c[i]});
adj[z].push_back({x, c[i]});
adj[y].push_back({z, -d[i]});
adj[z].push_back({y, d[i]});
}
vector<int> ord(n);
iota(all(ord), 0);
sort(all(ord), [&](int i, int j) { return p[i] < p[j]; });
for (int x : ord) if (!seen[x]) dfs(x);
}
int query(int x, int y) {
return dist[x] + dist[y] - 2 * dist[getlca(x, y)];
}
};
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin >> n >> k >> q >> t;
for (int i = 0; i < n; i++) {
int p;
cin >> p;
if (p == -1) {
r1 = i;
} else {
--p;
tree1::add(i, p);
}
}
for (int i = 0; i < n; i++) {
int p;
cin >> p;
if (p == -1) {
r2 = i;
} else {
--p;
tree2::add(i, p);
}
}
tree1::dfs(r1, r1);
tree2::dfs(r2, r2);
tree2::order();
for (int i = 0; i < k; i++) {
cout << ids[i] + 1 << " ";
}
cout << "\n";
for (int i = 0; i + 1 < k; i++) {
cout << "? " << ids[i] + 1 << " " << ids[i + 1] + 1 << "\n";
}
cout << "!" << endl;
for (int i = 0; i + 1 < k; i++) {
cin >> a[i] >> b[i] >> c[i] >> d[i];
}
tree1::build();
tree2::build();
vector<int> x(t), y(t);
for (int i = 0; i < t; i++) {
cin >> x[i] >> y[i];
--x[i]; --y[i];
}
for (int i = 0; i < t; i++) {
cout << tree1::query(x[i], y[i]) << " " << tree2::query(x[i], y[i]) << "\n";
}
cout << endl;
}
Compilation message
Main.cpp: In function 'void tree1::dfs(int)':
Main.cpp:46:20: warning: comparison of constant '-1' with boolean expression is always true [-Wbool-compare]
46 | if (!seen[y[0]] != -1) continue;
| ~~~~~~~~~~~~^~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1469 ms |
559096 KB |
Execution killed with signal 13 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1573 ms |
563336 KB |
Execution killed with signal 13 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1436 ms |
551320 KB |
Execution killed with signal 13 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
3068 ms |
960480 KB |
Execution killed with signal 13 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
3214 ms |
970352 KB |
Execution killed with signal 13 |
| 2 |
Halted |
0 ms |
0 KB |
- |
