Function preprocess

Trees/LCA.cpp:44–51

}
 
void preprocess(int root) {
    tin.resize(n);
    tout.resize(n);
    timer = 0;
    l = ceil(log2(n));
    up.assign(n, vector<int>(l + 1));
    dfs(root, root);
}
 
void solve(){
    int q;