Cod sursa(job #3343612)

Utilizator Dia3141Costea Diana Stefania Dia3141 Data 27 februarie 2026 20:33:34
Problema Lowest Common Ancestor Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.93 kb
#include <fstream>
#include <vector>
#define nmax (int)(1e5+1)
using namespace std;
ifstream cin("lca.in");
ofstream cout("lca.out");
int rmq[18][nmax],n,q,x,y,st[nmax],dr[nmax],k;
vector<int>v[nmax];
void dfs(int nod){
    st[nod]=++k;
    for(auto i:v[nod])
        dfs(i);
    dr[nod]=++k;
}
bool is_dad(int x,int y){
    return st[x]<=st[y]&&dr[y]<=dr[x];
}
int lca(int x,int y){
    if(is_dad(x,y))
        return x;
    if(is_dad(y,x))
        return y;
    for(int i=17;i>=0;i--)
        if(rmq[i][x]!=0&&!is_dad(rmq[i][x],y))
            x=rmq[i][x];
    return rmq[0][x];
}
int main()
{
    cin>>n>>q;
    for(int i=2;i<=n;i++){
        cin>>rmq[0][i];
        v[rmq[0][i]].push_back(i);
    }
    dfs(1);
    for(int i=1;i<18;i++)
        for(int j=1;j<=n;j++)
            rmq[i][j]=rmq[i-1][rmq[i-1][j]];

    while(q--){
        cin>>x>>y;
        cout<<lca(x,y)<<'\n';
    }
    return 0;
}