Submission #172747

#	Time	Username	Problem	Language	Result	Execution time	Memory
172747		mosiashvililuka	Birthday gift (IZhO18_treearray)	C++14	56 / 100	198 ms	860 KiB

treearray

#include<bits/stdc++.h>
using namespace std;
int a,b,c,d,e,tes,t,f[2009],i,j,tp,k[2009],lf[2009],rg[2009],tim,l,r,lc,msh[2009][11];
vector <int> v[2009];
int bo;
void dfs(int q, int w){
    msh[q][0]=w;
    for(int h=1; h<=10; h++) msh[q][h]=msh[msh[q][h-1]][h-1];
    tim++;
    lf[q]=rg[q]=tim;
    for(vector <int>::iterator it=v[q].begin(); it!=v[q].end(); it++){
        if((*it)==w) continue;
        dfs((*it),q);
        if(rg[q]<rg[(*it)]) rg[q]=rg[(*it)];
    }
}
bool anc(long long q, long long w){
    if(lf[q]<=lf[w]&&rg[q]>=rg[w]) return 1; else return 0;
}
int main(){
    ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    cin>>a>>b>>tes;
    for(i=1; i<a; i++){
        cin>>c>>d;
        v[c].push_back(d);
        v[d].push_back(c);
    }
    dfs(1,0);
    for(i=1; i<=b; i++) cin>>f[i];
    for(t=1; t<=tes; t++){
        cin>>tp;
        if(tp==1){
            cin>>c>>d;
            f[c]=d;
            continue;
        }
        cin>>l>>r>>lc;
        bo=0;
        for(i=l; i<=r; i++){
            if(f[i]==lc){
                bo=i;
                break;
            }
            if(anc(lc,f[i])==0){
                k[i]=0;
            }else{
                int ff=f[i];
                for(j=10; j>=0; j--){
                    if(msh[ff][j]!=0&&anc(msh[ff][j],lc)==0) ff=msh[ff][j];
                }
                k[i]=ff;
            }
        }
        if(bo!=0){
            cout<<bo<<" "<<bo<<endl;
            continue;
        }
        j=r+1;
        pair <pair <int, int> , pair <int, int> > p;
        bo=0;
        for(i=r; i>=l; i--){
            if(k[i]==0){
                j=i;
                continue;
            }
            c=0;
            if(p.first.second!=k[i]) c=p.first.first; else c=p.second.first;
            if(c!=0){
                if(j>c){
                    cout<<i<<" "<<c<<endl;
                    bo=1;
                    break;
                }
            }
            //
            if(p.first.second!=k[i]){
                p.second=p.first;
                p.first.first=i;
                p.first.second=k[i];
            }else{
                p.first.first=i;
            }
        }
        if(bo==0){
            cout<<"-1 -1"<<endl;
        }
    }
    return 0;
}

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