Submission #440950

#	Time	Username	Problem	Language	Result	Execution time	Memory
440950		Aryan_Raina	Birthday gift (IZhO18_treearray)	C++17	0 / 100	16 ms	23884 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][v];

    if (u == v) return 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);
    for (int &i : A) cin >> i, --i;

    dfs(0,0);
    for (int i = 0; i < M; i++) t[A[i]].insert(i);
    for (int i = 0; i < M-1; i++) tnt[lca(A[i], A[i+1])].insert(i);

    for (int i = 0; i < N; i++)
        t[i].insert(M+1), tnt[i].insert(M+1);

    while (Q--) {
        int typ; cin >> typ; --typ;
        if (typ) {
            int l, r, v; cin >> l >> r >> v; 
            --l, --r, --v;
            int ans = *t[v].lower_bound(l);
            if (ans <= r) {
                cout << ans+1 << ' ' << ans+1 << '\n';
                continue;
            }

            ans = *tnt[v].lower_bound(l);
            if (ans + 1 <= r) {
                cout << ans+1 << ' ' << ans+2 << '\n';
                continue;
            }

            cout << "-1 -1\n";
        } else {
            int pos, v; cin >> pos >> v; 
            --pos, --v;

            t[A[pos]].erase(t[A[pos]].find(pos));
            if (pos + 1 < M) {
                int omk = lca(A[pos], A[pos+1]);
                tnt[omk].erase(tnt[omk].find(pos));
            }
            if (pos - 1 >= 0) {
                int omk = lca(A[pos-1], A[pos]);
                tnt[omk].erase(tnt[omk].find(pos-1));
            }

            A[pos] = v;

            t[A[pos]].insert(pos);
            if (pos + 1 < M)
                tnt[lca(A[pos], A[pos+1])].insert(pos);
            if (pos - 1 >= 0)
                tnt[lca(A[pos-1], A[pos])].insert(pos-1);
        }   
    }
}

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