#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 pv;
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 op, int k) {
while (top[a] != top[b]) {
if (dep[top[a]] < dep[top[b]]) swap(a, b);
int st = top[a];
if (op == 1) minSeg.update(in[st], in[a], k);
else maxSeg.update(in[st], in[a], k);
a = par[st];
}
if (dep[a] > dep[b]) swap(a, b);
if (op == 1) minSeg.update(in[a] + 1, in[b], k);
else maxSeg.update(in[a] + 1, in[b], k);
}
int maxi[MAX_N], mini[MAX_N], cnt[MAX_N], ans[MAX_N], vis[MAX_N];
struct Query {
int s, e, x, mx;
};
vector<Query> qry;
map<int, int> mp;
vector<int> bench[MAX_N];
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;
for (int i = 0; i < q; i++) {
char op;
int a, b, c;
cin >> op >> a >> b >> c;
if (op == 'm') update(a, b, 2, c);
else update(a, b, 1, c);
qry.push_back({a, b, c, op == 'M'});
}
for (int i = 0; i < q; i++) {
mp[qry[i].x] = i;
}
for (int i = 2; i <= n; i++) {
int mx = maxSeg.query(in[i], in[i]);
int mn = minSeg.query(in[i], in[i]);
if (mx != -INF) {
maxi[i] = mp[mx];
bench[maxi[i]].push_back(i);
} else maxi[i] = -1;
if (mn != INF) {
mini[i] = mp[mn];
bench[mini[i]].push_back(i);
} else mini[i] = -1;
}
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[i] = bench[i].size();
pq.push({bench[i].size(), i});
}
while (!pq.empty()) {
auto [x, y] = pq.top();
pq.pop();
if (x != cnt[y]) continue;
vis[y] = true;
for (int i: bench[y]) {
if (chk[i]) continue;
ans[i] = qry[y].x;
chk[i] = true;
if (qry[y].mx) {
if (maxi[i] != -INF) {
cnt[mp[maxi[i]]]--;
if (!vis[mp[maxi[i]]]) pq.push({cnt[mp[maxi[i]]], mp[maxi[i]]});
}
} else {
if (mini[i] != INF) {
cnt[mp[mini[i]]]--;
if (!vis[mp[mini[i]]]) pq.push({cnt[mp[mini[i]]], mp[mini[i]]});
}
}
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";
}
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
12632 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12636 KB |
Output is correct |
| 3 |
Correct |
3 ms |
12636 KB |
Output is correct |
| 4 |
Correct |
3 ms |
12636 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
177 ms |
29284 KB |
Output is correct |
| 2 |
Correct |
184 ms |
25024 KB |
Output is correct |
| 3 |
Correct |
164 ms |
26564 KB |
Output is correct |
| 4 |
Correct |
167 ms |
30492 KB |
Output is correct |
| 5 |
Correct |
177 ms |
25948 KB |
Output is correct |
| 6 |
Correct |
164 ms |
26428 KB |
Output is correct |
| 7 |
Correct |
150 ms |
25656 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
98 ms |
19664 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
12632 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12636 KB |
Output is correct |
| 3 |
Correct |
3 ms |
12636 KB |
Output is correct |
| 4 |
Correct |
3 ms |
12636 KB |
Output is correct |
| 5 |
Correct |
177 ms |
29284 KB |
Output is correct |
| 6 |
Correct |
184 ms |
25024 KB |
Output is correct |
| 7 |
Correct |
164 ms |
26564 KB |
Output is correct |
| 8 |
Correct |
167 ms |
30492 KB |
Output is correct |
| 9 |
Correct |
177 ms |
25948 KB |
Output is correct |
| 10 |
Correct |
164 ms |
26428 KB |
Output is correct |
| 11 |
Correct |
150 ms |
25656 KB |
Output is correct |
| 12 |
Incorrect |
98 ms |
19664 KB |
Output isn't correct |
| 13 |
Halted |
0 ms |
0 KB |
- |
