#include <bits/stdc++.h>
using namespace std;
int n, m, q, par[200005], g[200005] = {-1}, a[200005];
vector<int> adj[200005];
void dfs(int u, int p) {
g[u] = g[p] + 1;
par[u] = p;
for(auto v : adj[u]) if(v != p) dfs(v, u);
}
int lca(int v, int u) {
if(g[v] > g[u]) return lca(par[v], u);
if(g[v] < g[u]) return lca(v, par[u]);
if(v != u) return lca(p[v], u);
return v;
}
int main() {
ios_base::sync_with_stdio(false); cin.tie(NULL);
cin >> n >> m >> q;
for (int i = 1; i < n; i++){
int u, v; cin >> u >> v;
adj[u].push_back(v);
adj[v].push_back(u);
}
for (int i = 1; i < m + 1; i++) cin >> a[i];
dfs(1, 0);
while(q--){
int op; cin >> op;
if(op == 1){
int idx, val; cin >> idx >> val;
a[idx] = val;
}
else {
int l, r, v, ptr_l = -1, ptr_r = -1; cin >> l >> r >> v;
for (int u = l; u <= r; u++){
if(u != r && lca(a[u], a[u + 1]) == v){
ptr_l = x; ptr_r = x + 1;
break;
} else if(a[u] == v){
ptr_l = u; ptr_r = x;
break;
}
}
cout << ptr_l << ' ' << ptr_r << '\n';
}
}
}
Compilation message
treearray.cpp: In function 'int lca(int, int)':
treearray.cpp:16:24: error: 'p' was not declared in this scope
16 | if(v != u) return lca(p[v], u);
| ^
treearray.cpp: In function 'int main()':
treearray.cpp:40:14: error: 'x' was not declared in this scope
40 | ptr_l = x; ptr_r = x + 1;
| ^
treearray.cpp:43:40: error: 'x' was not declared in this scope
43 | ptr_l = u; ptr_r = x;
| ^
