제출 #446180

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
446180		ak2006	Birthday gift (IZhO18_treearray)	C++14	0 / 100	25 ms	30028 KiB

treearray

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vb = vector<bool>;
using vvb = vector<vb>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vc = vector<char>;
using vvc = vector<vc>;
using vs = vector<string>;
const ll mod = 1e9 + 7,inf = 1e18;
#define pb push_back
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
void setIO()
{
    fast;
}

int n = 2e5 + 5,m,q,TIMER;
vvi adj(n);
vvi anc(n,vi(21));
vi in(n),out(n);

void dfs(int u,int p)
{

    in[u] = ++TIMER;
    anc[u][0] = p;
    for (int i = 1;i<=20;i++)anc[u][i] = anc[anc[u][i - 1]][i - 1];
    for (int v:adj[u]){
        if (v == p)continue;
        dfs(v,u);
    }
    out[u] = ++TIMER;
}
bool is_ancestor(int u,int v)
{
    return in[u] <= in[v] && out[u] >= out[v];
}
int LCA(int u,int v)
{
    if (in[u] > in[v])swap(u,v);
    if (is_ancestor(u,v))return u;
    //cout<<u<<" "<<v<<endl;
    for (int i = 20;i>=0;i--){
        if (!is_ancestor(anc[v][i],u))v = anc[v][i];
    }
    return anc[v][0];
}

int main()
{
    setIO();
    cin>>n>>m>>q;
    vi a(m + 1);
    vector<set<int>>lcas(n + 1);
    vector<set<int>>positions(n + 1);

    for (int i = 1;i<=n - 1;i++){
        int u,v;
        cin>>u>>v;
        adj[u].pb(v),adj[v].pb(u);
    }
    for (int i = 1;i<=m;i++)cin>>a[i],positions[a[i]].insert(i);
    dfs(1,1);
    
    for (int i = 1;i<=m - 1;i++)
        lcas[LCA(a[i],a[i + 1])].insert(i);

    // for (int i = 1;i<=n;i++){
    //     cout<<lcas[i].size()<<endl;
    //     for (auto it:lcas[i])cout<<it<<" ";
    //     cout<<endl;
    // }
    
    while (q--){
        int type,v;
        cin>>type;

        if (type == 1){
            int pos;
            cin>>pos>>v;

            if (pos >= 2)lcas[LCA(a[pos - 1],a[pos])].erase(pos - 1);
            if (pos + 1 <= m)lcas[LCA(a[pos],a[pos + 1])].erase(pos);

            positions[a[pos]].erase(pos);
            a[pos] = v;
            positions[a[pos]].insert(pos);


            if (pos >= 2)lcas[LCA(a[pos - 1],a[pos])].insert(pos - 1);
            if (pos + 1 <= m)lcas[LCA(a[pos],a[pos + 1])].insert(pos);

        }
        else{
            int l,r;
            cin>>l>>r>>v;

            auto it = positions[v].lower_bound(l),
            it2 = lcas[v].lower_bound(l);
            
            if (it != positions[v].end() && *it + 1<= r)
                cout<<*it<<" "<<*it + 1<<'\n';
            else if (it2 != lcas[v].end() && *it + 1 <= r)
                cout<<*it2<<" "<<*it2 + 1<<'\n';
            else cout<<"-1 -1"<<'\n';
        }
    }
    return 0;
}

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