Submission #440992

#	Time	Username	Problem	Language	Result	Execution time	Memory
440992		Aryan_Raina	Birthday gift (IZhO18_treearray)	C++17	0 / 100	13 ms	23928 KiB

treearray

#include <bits/stdc++.h>
using namespace std;
 
#define int int64_t
#define ld long double
#define ar array
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
const int MOD = 1e9+7;
const int INF = 1e15+5;
 
const int MXN = 2e5+9;
 
vector<int> g[MXN];
int up[20][MXN], dep[MXN];
set<int> tnt[MXN], t[MXN];
 
void dfs(int u, int pu) {
    up[0][u] = pu;
    for (int i = 1; i < 20; i++)
        up[i][u] = up[i-1][up[i-1][u]];
 
    for (int v : g[u]) if (v != pu) {
        dep[v] = dep[u] + 1; dfs(v, u);
    }
}
 
int lca(int u, int v) {
    if (dep[v] > dep[u]) swap(v, u);
    for (int i = 19; i >= 0; --i)
        if (((dep[u]-dep[v]) >> i)&1)
            u = up[i][u];
 
    for (int i = 19; i >= 0; --i)
        if (up[i][u] != up[i][v])
            u = up[i][u], v = up[i][v];
 
    return up[0][u];
}
 
void solve() {
    int N, M, Q; cin >> N >> M >> Q;
    for (int i = 0; i < N-1; i++) {
        int a, b; cin >> a >> b;
        g[a].push_back(b);
        g[b].push_back(a);
    }
 
    vector<int> A(M+1);
    for (int i = 1; i <= M; i++) cin >> A[i];
 
    dfs(1,1);
    for (int i = 1; i <= M; i++) t[A[i]].insert(i);
    for (int i = 1; i <= M-1; i++) tnt[lca(A[i], A[i+1])].insert(i);
 
    while (Q--) {
        int typ; cin >> typ; --typ;
        if (typ) {
            int l, r, v; cin >> l >> r >> v; 

            auto itr1 = t[v].lower_bound(l);
            auto itr2 = tnt[v].lower_bound(l);

            if (itr1 != t[v].end() && *itr1 <= r) {
                cout << *itr1 << ' ' << *itr1 << '\n';
            } else if (itr2 != tnt[v].end() && *itr2 + 1 <= r) {
                cout << *itr2 << ' ' << *itr2 + 1 << '\n';
            } else cout << "-1 -1\n";

        } else {
            int i, v; cin >> i >> v; 
            
            t[A[i]].erase(i); t[v].insert(i);

            if (i + 1 <= M) {
                tnt[lca(A[i], A[i+1])].erase(i);
                tnt[lca(v, A[i+1])].insert(i);
            }

            if (i - 1 >= 1) {
                tnt[lca(A[i-1], A[i])].erase(i-1);
                tnt[lca(A[i-1], v)].insert(i-1);
            }

            A[i] = v;
        }   
    }
}
 
int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0); 
 
    int t = 1; //cin >> t;
    while (t--) solve();   
}  

• Subtask 1: 0 / 12
• Subtask 2: 0 / 18
• Subtask 3: 0 / 26
• Subtask 4: 0 / 44