Submission #936370

#	Time	Username	Problem	Language	Result	Execution time	Memory
936370		starchan	XOR (IZhO12_xor)	C++17	100 / 100	205 ms	50532 KiB

xor

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define in pair<int, int>
#define f first
#define s second
#define pb push_back
#define pob pop_back
#define INF (int)1e17
#define MX (int)3e5+5
#define fast() ios_base::sync_with_stdio(false); cin.tie(NULL)
const int LOGM = 32;
struct trie
{
	vector<int> C[2];
	vector<int> sub;
	int chad = 0;
	void init()
	{
		C[0].pb(-1);
		C[1].pb(-1);
		sub.pb(INF);
		chad++;
		return;
	}
	void add(int x, int ind)
	{
		int curr = 0;
		sub[0] = min(sub[0], ind);
		for(int i = LOGM-1; i >= 0; i--)
		{
			int jatin = (x>>i)&1ll;
			if(C[jatin][curr] == -1)
			{
				C[jatin][curr] = chad++;
				C[0].pb(-1);
				C[1].pb(-1);
				sub.pb(INF);
			}
			curr = C[jatin][curr];
			sub[curr] = min(sub[curr], ind);
		}
		return;
	}
	int anataa(int x, int target)//is there stuff strictly greater than target?
	{
		int curr = 0;
		int val = INF;
		for(int i = LOGM-1; i >= 0; i--)
		{
			int jatin = ((x>>i)&1ll);
			int kshitij = ((target>>i)&1ll);
			if(kshitij == 0)
			{
				if(C[jatin^1][curr] != -1)
					val = min(val, sub[C[jatin^1][curr]]);
				if(C[jatin][curr] != -1)
					curr = C[jatin][curr];
				else
					return val;
			} 
			else
			{
				if(C[jatin^1][curr] == -1)
					return val;
				curr = C[jatin^1][curr];
			}
		}
		return val;
	}
};
signed main()
{
	fast();
	trie work;
	work.init();
	int n, x;
	cin >> n >> x;
	vector<int> a(n+1, 0);
	in ans = {INF, INF};
	for(int i = 1; i <= n; i++)
	{
		work.add(a[i-1], i-1);
		cin >> a[i];
		a[i]^=a[i-1];
		int r = work.anataa(a[i], x-1);//[r+1, .., i]
		ans = min(ans, {r-i, r+1});
	}
	cout << ans.s << " " << -ans.f << "\n";
	return 0;
}	

• Subtask 1: 100 / 100