Submission #223367

#	Time	Username	Problem	Language	Result	Execution time	Memory
223367		oolimry	Klasika (COCI20_klasika)	C++14	66 / 110	2920 ms	460388 KiB

klasika

#include <bits/stdc++.h>
 
using namespace std;
 
int n = 1;
int cnt = 0;
static vector<int> adj[200005];
static int low[200005];
static int high[200005];
static int XOR[200005];
 
void dfs(int u){
	low[u] = cnt;
	high[u] = cnt;
	cnt++;
	for(int v : adj[u]){
		dfs(v);
		high[u] = max(high[u], high[v]);
	}
}
 
typedef pair<int,int> ii;
vector<ii> queries;

int N = 0;

static ii trie[4000005];
static set<int> S[4000005];
int CNT = 2;

void INS(int x, int pos){
	int u = 1;
	for(int b = 30;b >= 0;b--){
		if((x & (1<<b)) == 0){
			if(trie[u].first == 0){
				trie[u].first = CNT;
				CNT++;
			}
			u = trie[u].first;
		}
		else{
			if(trie[u].second == 0){
				trie[u].second = CNT;
				CNT++;
			}
			u = trie[u].second;
		}
		S[u].insert(pos);
	}
}

int main(){
	//freopen("i.txt","r",stdin);
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	int Q; cin >> Q;
	queries.push_back(ii(-1,0));
	
	for(int q = 0;q < Q;q++){
		string s; int a, b; 
		cin >> s >> a >> b;
		if(s[0] == 'A' || s[0] == 'a'){
			a--;
			assert(a < n);
			adj[a].push_back(n);
			XOR[n] = XOR[a] ^ b;
			queries.push_back(ii(-1,n));
			n++;
		}
		else{
			assert(a-1 < n);
			assert(b-1 < n);
			queries.push_back(ii(a-1,b-1));
		}
	}
	
	
	dfs(0);
	
	for(ii q : queries){
		//cout << q.first << " " << q.second << "\n";
		
		if(q.first == -1){
			int pos = low[q.second];
			int x = XOR[q.second];
			
			INS(x, pos);
			
			continue;
		}
		
		int other = XOR[q.first];
		int L = low[q.second], R = high[q.second];
		int cur = 0;
		
		int u = 1;
		for(int b = 30;b >= 0;b--){
			int pref = trie[u].first;
			int nopref = trie[u].second;
			
			if(pref == 0){
				cur ^= (1 << b);
				u = nopref; continue;
			}
			if(nopref == 0){
				u = pref; continue;
			}
			
			if((other & (1<<b)) == 0){
				swap(pref, nopref);
				cur ^= (1 << b);
			}
			
			if(Q <= 2000){
				set<int> s = S[pref];
				auto it = s.lower_bound(L);
				if(it == s.end() || *it > R){
					cur ^= (1 << b);
					u = nopref;
				}
				else u = pref;
			}
			else u = pref;
			
		}
		
		cout << (cur ^ other) << "\n";
		
	}
}

• Subtask 1: 11 / 11
• Subtask 2: 22 / 22
• Subtask 3: 33 / 33
• Subtask 4: 0 / 44