Submission #902509

#	Time	Username	Problem	Language	Result	Execution time	Memory
902509		LCJLY	XOR (IZhO12_xor)	C++14	100 / 100	324 ms	116660 KiB

xor

#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl; 
#define show4(x,y) for(auto it:x) cout << it << " "; cout << #y << endl;
typedef pair<long long,long long>pii;

struct trie{
	trie *next[2];
	int left=INT_MAX;
	
	trie(){
		next[0]=next[1]=NULL;
	}
};

auto root=new trie();
	
void solve(){	
	int n,k;
	cin >> n >> k;
	
	int arr[n];
	for(int x=0;x<n;x++){
		cin >> arr[x];
	}
	
	int hold=0;
	int best=-1;
	int index=-1;
	auto cur2=root;
	for(int x=30;x>=0;x--){
		if(cur2->next[0]==NULL) cur2->next[0]=new trie();
		cur2=cur2->next[0];
		cur2->left=-1;
	}
	for(int x=0;x<n;x++){
		hold^=arr[x];
		auto cur=root;
		//query
		for(int y=30;y>=0;y--){
			if(k&(1<<y)){
				bool amos=(hold&(1<<y));
				amos^=1;
				//cout << amos;
				if(cur->next[amos]==NULL)cur->next[amos]=new trie();
				cur=cur->next[amos];
			}
			else{
				bool amos=(hold&(1<<y));
				//cout << amos;
				if(cur->next[amos]==NULL)cur->next[amos]=new trie();
				if(cur->next[!amos]!=NULL){
					int cnt=x-cur->next[!amos]->left;
					if(cnt>best){
						best=cnt;
						index=x+1;
					}
				}
				cur=cur->next[amos];
			}
		}
		
		//cout << endl;
		//show(best,best);
		if(x-cur->left>best){
			best=x-cur->left;
			index=x+1;
		}
		
		//add
		cur=root;
		for(int y=30;y>=0;y--){
			bool amos=(hold&(1<<y));
			if(cur->next[amos]==NULL)cur->next[amos]=new trie();
			cur=cur->next[amos];
			cur->left=min(cur->left,x);
		}
		//show(best2,best);
	}
	
	cout << index-best+1 << " " << best;
}	
 
int32_t main(){										
	ios::sync_with_stdio(0);	
	cin.tie(0);
	int t=1;
	//cin >> t;
	while(t--){
		solve();
	}
}


 

• Subtask 1: 100 / 100