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Submission #1119057

#TimeUsernameProblemLanguageResultExecution timeMemory
1119057ttamxKlasika (COCI20_klasika)C++17
0 / 110
398 ms188520 KiB
#include<bits/stdc++.h> using namespace std; const int N=2e5+5; int n,q; vector<tuple<int,int,int>> qr; int val[N]; vector<int> adj[N]; int tin[N],tout[N],pos[N]; int timer=0; set<int> alive; struct Trie{ struct Node; using Ptr = Node*; struct Node{ int cnt; array<Ptr,2> ch; Node():cnt(0),ch{nullptr,nullptr}{} }; Ptr root[N]; Ptr clone(Ptr o){ if(o)return new Node(*o); else return new Node(); } int get_cnt(Ptr t){ return t?t->cnt:0; } Ptr get_ch(Ptr t,int i){ return t?t->ch[i]:nullptr; } Ptr update(Ptr o,int x){ Ptr rt=clone(o); Ptr u=rt; u->cnt++; for(int i=29;i>=0;i--){ int c=x>>i&1; u->ch[c]=clone(o=get_ch(o,c)); u=u->ch[c]; u->cnt++; } return rt; } int query(Ptr tl,Ptr tr,int x){ int res=0; for(int i=29;i>=0;i--){ int c=x>>i&1; if(get_cnt(get_ch(tr,c^1))-get_cnt(get_ch(tl,c^1))){ tl=get_ch(tl,c^1); tr=get_ch(tr,c^1); res|=1<<i; }else{ tl=get_ch(tl,c); tr=get_ch(tr,c); } } return res; } }tr; void dfs(int u){ tin[u]=++timer; pos[timer]=u; for(auto v:adj[u]){ dfs(v); } tout[u]=timer; } int main(){ cin.tie(nullptr)->sync_with_stdio(false); cin >> q; qr.resize(q); n=1; for(auto &[o,x,y]:qr){ string op; cin >> op >> x >> y; if(op=="Add"){ o=0; val[++n]=val[x]^y; adj[x].emplace_back(n); x=n; }else{ o=1; } } dfs(1); tr.root[0]=nullptr; for(int i=1;i<=n;i++){ tr.root[i]=tr.update(tr.root[i-1],val[pos[i]]); } alive.emplace(tin[1]); for(auto &[o,x,y]:qr){ if(o==0){ alive.emplace(tin[x]); }else{ int l=tin[y]; int r=*prev(alive.upper_bound(tout[y])); cout << tr.query(tr.root[l-1],tr.root[r],val[x]) << "\n"; } } }
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