#include <bits/stdc++.h>
using namespace std;
const int MAX_N = 70070;
const int INF = 1e9 + 100;
int n, q;
struct SegmentTree {
typedef int (*F)(int, int);
F merge;
int identity;
int tree[MAX_N * 4]{}, lazy[MAX_N * 4]{};
SegmentTree(F func, int identity) : merge(func), identity(identity) {
for (int i = 0; i < MAX_N * 4; ++i) tree[i] = lazy[i] = identity;
}
void push(int node, int l, int r) {
if (lazy[node] != identity) {
tree[node] = merge(tree[node], lazy[node]);
if (l != r) {
lazy[node * 2] = merge(lazy[node * 2], lazy[node]);
lazy[node * 2 + 1] = merge(lazy[node * 2 + 1], lazy[node]);
}
}
lazy[node] = identity;
}
void update(int s, int e, int val, int node = 1, int l = 1, int r = MAX_N) {
push(node, l, r);
if (e < l || r < s) return;
if (s <= l && r <= e) {
lazy[node] = val;
push(node, l, r);
return;
}
int mid = (l + r) / 2;
update(s, e, val, node * 2, l, mid);
update(s, e, val, node * 2 + 1, mid + 1, r);
tree[node] = merge(tree[node * 2], tree[node * 2 + 1]);
}
int query(int s, int e, int node = 1, int l = 1, int r = MAX_N) {
push(node, l, r);
if (e < l || r < s) return identity;
if (s <= l && r <= e) return tree[node];
int mid = (l + r) / 2;
return merge(query(s, e, node * 2, l, mid), query(s, e, node * 2 + 1, mid + 1, r));
}
};
int _mn(int a, int b) {
return min(a, b);
}
int _mx(int a, int b) {
return max(a, b);
}
SegmentTree minSeg(_mn, INF), maxSeg(_mx, -INF);
int in[MAX_N], dep[MAX_N], par[MAX_N], top[MAX_N], sz[MAX_N], chk[MAX_N];
int maxi[MAX_N], mini[MAX_N], cnt[MAX_N], ans[MAX_N], vis[MAX_N];
int pv;
map<int, int> toIdx;
vector<int> bench[MAX_N];
vector<int> g[MAX_N], inp[MAX_N];
void dfs(int v = 1) {
chk[v] = 1;
for (auto i: inp[v]) {
if (chk[i]) continue;
chk[i] = 1;
g[v].push_back(i);
dfs(i);
}
}
void dfs1(int v = 1) {
sz[v] = 1;
for (auto &i: g[v]) {
dep[i] = dep[v] + 1;
par[i] = v;
dfs1(i);
sz[v] += sz[i];
if (sz[i] > sz[g[v][0]]) swap(i, g[v][0]);
}
}
void dfs2(int v = 1) {
in[v] = ++pv;
for (auto i: g[v]) {
top[i] = i == g[v][0] ? top[v] : i;
dfs2(i);
}
}
void update(int a, int b, int k, bool type) {
while (top[a] != top[b]) {
if (dep[top[a]] < dep[top[b]]) swap(a, b);
int st = top[a];
type ? minSeg.update(in[st], in[a], k) : maxSeg.update(in[st], in[a], k);
a = par[st];
}
if (dep[a] > dep[b]) swap(a, b);
type ? minSeg.update(in[a] + 1, in[b], k) : maxSeg.update(in[a] + 1, in[b], k);
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
cin >> n;
top[1] = 1;
for (int i = 2; i <= n; i++) {
int s, e;
cin >> s >> e;
inp[s].push_back(e);
inp[e].push_back(s);
}
dfs();
dfs1();
dfs2();
cin >> q;
vector<int> zz;
for (int i = 0; i < q; i++) {
char op;
int x, y, z;
cin >> op >> x >> y >> z;
if (op == 'm') update(x, y, false, z);
else update(x, y, true, z);
zz.push_back(z);
}
for (int i = 0; i < q; i++) {
toIdx[zz[i]] = i;
}
for (int i = 2; i <= n; i++) {
maxi[i] = maxSeg.query(in[i], in[i]);
mini[i] = minSeg.query(in[i], in[i]);
if (maxi[i] != -INF) {
bench[toIdx[maxi[i]]].push_back(i);
}
if (mini[i] != INF) {
bench[toIdx[mini[i]]].push_back(i);
}
}
memset(chk, 0, sizeof chk);
priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pq;
for (int i = 0; i < q; i++) {
cnt[toIdx[zz[i]]] = bench[toIdx[zz[i]]].size();
pq.push({cnt[toIdx[zz[i]]], i});
}
while (!pq.empty()) {
auto [am, id] = pq.top();
pq.pop();
if (am != cnt[id]) continue;
vis[id] = true;
for (auto node: bench[id]) {
if (chk[node]) continue;
ans[node] = zz[id];
chk[node] = true;
if (maxi[node] != -INF && !vis[toIdx[maxi[node]]]) {
cnt[toIdx[maxi[node]]]--;
pq.emplace(cnt[toIdx[maxi[node]]], toIdx[maxi[node]]);
}
if (mini[node] != INF && !vis[toIdx[mini[node]]]) {
cnt[toIdx[mini[node]]]--;
pq.emplace(cnt[toIdx[mini[node]]], toIdx[mini[node]]);
}
break;
}
}
for (int i = 2; i <= n; i++) if (!chk[i]) ans[i] = maxi[i];
for (int i = 2; i <= n; i++) {
cout << par[i] << " " << i << " " << ans[i] << "\n";
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
12636 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
166 ms |
25900 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
115 ms |
18984 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
12636 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
