Submission #368239

#	Time	Username	Problem	Language	Result	Execution time	Memory
368239		nicolaalexandra	Birthday gift (IZhO18_treearray)	C++14	100 / 100	1465 ms	132016 KiB

treearray

#include <bits/stdc++.h>
#define DIM 200010
using namespace std;

vector <int> L[DIM];
pair <int,int> rmq[20][DIM*3];
set <int> s[DIM],s2[DIM];
int E[DIM*3],p[DIM*3],first[DIM],level[DIM],v[DIM];
int n,m,i,j,x,y,pos,val,q,k,tip,l,r;

void dfs (int nod, int tata){
    level[nod] = 1 + level[tata];
    E[++k] = nod;
    first[nod] = k;
    for (auto vecin : L[nod])
        if (vecin != tata){
            dfs (vecin,nod);
            E[++k] = nod;
        }
}

int get_lca (int x, int y){
    int posx = first[x], posy = first[y];
    if (posx > posy)
        swap (posx,posy);
    int nr = p[posy-posx+1];
    pair <int,int> sol = min (rmq[nr][posx],rmq[nr][posy-(1<<nr)+1]);
    return E[sol.second];
}

int main (){

    //ifstream cin ("date.in");
    //ofstream cout ("date.out");

    cin>>n>>m>>q;
    for (i=1;i<n;i++){
        cin>>x>>y;
        L[x].push_back(y);
        L[y].push_back(x);
    }

    dfs (1,0);

    for (i=1;i<=k;i++)
        rmq[0][i] = make_pair(level[E[i]],i);

    for (i=1;(1<<i)<=k;i++)
        for (j=1;j<=k;j++){
            rmq[i][j] = rmq[i-1][j];
            if (j + (1<<(i-1)) <= k && rmq[i-1][j + (1<<(i-1))].first < rmq[i][j].first)
                rmq[i][j] = rmq[i-1][j + (1<<(i-1))];
        }

    for (i=2;i<=k;i++)
        p[i] = p[i/2] + 1;

    for (i=1;i<=m;i++){
        cin>>v[i];
        s2[v[i]].insert(i);
    }

    for (i=1;i<m;i++){
        int lca = get_lca (v[i],v[i+1]);
        s[lca].insert(i);
    }

    for (;q--;){
        cin>>tip;
        if (tip == 1){
            cin>>pos>>val;

            if (pos > 1){
                int lca = get_lca (v[pos-1],v[pos]);
                s[lca].erase(pos-1);
            }
            if (pos < m){
                int lca = get_lca (v[pos],v[pos+1]);
                s[lca].erase(pos);
            }

            s2[v[pos]].erase(pos);

            v[pos] = val;

            s2[v[pos]].insert(pos);

            if (pos > 1){
                int lca = get_lca (v[pos-1],v[pos]);
                s[lca].insert(pos-1);
            }
            if (pos < m){
                int lca = get_lca (v[pos],v[pos+1]);
                s[lca].insert(pos);
            }

        } else {
            cin>>l>>r>>val;

            set <int> :: iterator it = s2[val].lower_bound(l);

            if (it != s2[val].end() && *it <= r){
                cout<<(*it)<<" "<<(*it)<<"\n";
                continue;
            }


            it = s[val].lower_bound(l);
            pos = *it;
            if (it == s[val].end() || *it >= r)
                cout<<"-1 -1\n";
            else cout<<(*it)<<" "<<(*it)+1<<"\n";

        }
    }

    return 0;
}

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