#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pbds tree<pair<ll, ll>, null_type, less<pair<ll,ll>>,rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
int dx[8] = {1, 0, 0, -1, 1, 1, -1, -1};
int dy[8] = {0, 1, -1, 0, 1, -1, -1, 1};
#define endl "\n"
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd pair<double,double>
#define vdd vector<pdd>
#define speed ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
////////////////////Only Clear Code//////////////////////////
void usaco_problem(){
freopen("milkvisits.in", "r", stdin);
freopen("milkvisits.out", "w", stdout);
}
void init(){
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif // ONLINE_JUDGE
}
const int mx = 2e5+5;
const int LOG = 25;
const int inf = 1e9;
const ll mod = 1e8;
int pf[mx];
vii graph[mx];
vector<vector<int>> nxt;
vector<unordered_set<int>> after = {unordered_set<int>()};
vector<vi> queries;
int low[mx], high[mx];
int c = 0;
void dfs1(int node){
high[node] = 1;
low[node] = c++;
for(pii adj : graph[node]){
dfs1(adj.ff);
high[node] += high[adj.ff];
}
}
bool verif(int node, int l, int r){
auto ind1 = after[node].lower_bound(l);
if(ind1 == after[node].end())return 0;
return (*(ind1) <= r);
}
int solve(int x, int l, int r){
int ans = 0;
int node = 0;
for(int j = 30;j >= 0;j--){
if((1 << j) & x){
if(nxt[node][0] != 0 && verif(nxt[node][0], l, r)){
node = nxt[node][0];
ans += (1 << j);
}
else if(nxt[node][1] != 0 && verif(nxt[node][1], l, r)){
node = nxt[node][1];
}
}
else{
if(nxt[node][1] != 0 && verif(nxt[node][1], l, r)){
node = nxt[node][1];
ans += (1 << j);
}
else if(nxt[node][0] != 0 && verif(nxt[node][0], l, r)){
node = nxt[node][0];
}
}
}
return ans;
}
void run_case(){
int q;cin >> q;
// Initialize
int n = 0, cnt = 0;
nxt.resize(1, vector<int>(2));
int node = 0;
after[node].insert(0);
for(int j = 30;j >= 0;j--){
if((1 << j) & 0){
if(nxt[node][1] == 0){
nxt[node][1] = ++cnt;
nxt.push_back({0, 0});
after.pb(unordered_set<int>());
}
node = nxt[node][1];
}
else{
if(nxt[node][0] == 0){
nxt[node][0] = ++cnt;
nxt.push_back({0, 0});
after.pb(unordered_set<int>());
}
node = nxt[node][0];
}
after[node].insert(0);
}
// construct tree
for(int i = 0; i < q;i++){
string type;cin >> type;
if(type == "Add"){
int x, y;cin >> x >> y;x--;
n++;
queries.pb({0, x , n, y});
graph[x].pb({n, y});
pf[n] = pf[x] ^ y;
}
else{
int a, b;cin >> a >> b;a--;b--;
queries.pb({1, a, b});
}
}
// construct euler tour
n++;
dfs1(0);
for(int i = 0; i <= cnt;i++){
high[i] += low[i]-1;
}
//construct modified trie + answer queries
for(int i = 0; i < q;i++){
int type = queries[i][0];
if(type==0){
int x = queries[i][1], cur = queries[i][2];
int node = 0;
after[node].insert(low[cur]);
for(int j = 30;j >= 0;j--){
if((1 << j) & pf[cur]){
if(nxt[node][1] == 0){
nxt[node][1] = ++cnt;
nxt.push_back({0, 0});
after.pb(unordered_set<int>());
}
node = nxt[node][1];
}
else{
if(nxt[node][0] == 0){
nxt[node][0] = ++cnt;
nxt.push_back({0, 0});
after.pb(unordered_set<int>());
}
node = nxt[node][0];
}
after[node].insert(low[cur]);
}
}
else{
int a = queries[i][1], b = queries[i][2];
cout << solve(pf[a], low[b], high[b]) << endl;
}
}
}
int main(){
speed;
int t;
//cin >> t;
t = 1;
while(t--){
run_case();
}
}
/*
NEVER GIVE UP!
DOING SMTHNG IS BETTER THAN DOING NTHNG!!!
Your Guide when stuck:
- Continue keyword only after reading the whole input
- Don't use memset with testcases
- Check for corner cases(n=1, n=0)
- Check where you declare n(Be careful of declaring it globally and in main)
*/
Compilation message
klasika.cpp: In function 'bool verif(int, int, int)':
klasika.cpp:75:29: error: '__gnu_cxx::__alloc_traits<std::allocator<std::unordered_set<int> >, std::unordered_set<int> >::value_type' {aka 'class std::unordered_set<int>'} has no member named 'lower_bound'
75 | auto ind1 = after[node].lower_bound(l);
| ^~~~~~~~~~~
klasika.cpp: In function 'void run_case()':
klasika.cpp:157:17: warning: unused variable 'x' [-Wunused-variable]
157 | int x = queries[i][1], cur = queries[i][2];
| ^
klasika.cpp: In function 'void usaco_problem()':
klasika.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
32 | freopen("milkvisits.in", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
klasika.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
33 | freopen("milkvisits.out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
klasika.cpp: In function 'void init()':
klasika.cpp:39:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
39 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
klasika.cpp:41:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
41 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
