Submission #571503

#	Time	Username	Problem	Language	Result	Execution time	Memory
571503		vbee	XOR (IZhO12_xor)	C++14	0 / 100	2 ms	4180 KiB

xor

#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define ii pair<int,int>
#define vii vector<ii>
#define vi vector<int>
#define fi first
#define se second
#define TASK "c"
#define ll long long
#define pll pair<ll, ll>
#define vll vector<ll>
#define vpll vector<pll>
#define pb push_back
#define MASK(i) (1 << (i))
#define BIT(x, i) ((x >> (i)) & 1)
 
using namespace std;

const int oo = 1e9 + 7;
const ll loo = (ll)1e18 + 7; 
const int N = 250007;

int n, x, a[N], prexor[N];
struct segtree{
	vector<int> t;
	void setup(){
		t.resize(4 * N + 7);
	}
	void update(int v, int lt, int rt, int pos, int value){
		if (lt == rt) return (void)(t[v] = value);
		int middle = (rt + lt) / 2;
		if (pos <= middle) update(v * 2, lt, middle, pos, value);
		else update(v * 2 + 1, middle + 1, rt, pos, value);
		t[v] = min(t[v * 2], t[v * 2 + 1]);
	}
	int query(int v, int lt, int rt, int y){
		if (t[v] > y) return -1;
		if (lt == rt) return lt;
		int middle = (rt + lt) / 2;
		if (t[v * 2] <= y) return query(v * 2, lt, middle, y);
		else return query(v * 2 + 1, middle + 1, rt, y);
	}
}seg;
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	// freopen(TASK".inp", "r", stdin);
	// freopen(TASK".out", "w", stdout);
	cin >> n >> x;
	prexor[1] = 0;
	for (int i = 1; i <= n; i++){
		cin >> a[i];
		prexor[i + 1] = prexor[i] ^ a[i];
	}
	seg.setup();
	for (int i = 1; i <= n + 1; i++) seg.update(1, 1, n + 1, i, prexor[i]);
	int id = 0, k = 0;
	for (int i = 2; i <= n + 1; i++){
		int cur = x ^ prexor[i];
		int res = seg.query(1, 1, n + 1, cur);
		if (res != -1){
			res++;
			int len = i - res;
			if (len > 0){
				if (len > k){
					k = len;
					id = res;
				}
				else if (len == k){
					id = min(id, res);
				}
			}
		}
	}
	cout << id << " " << k;
	return 0;
}

• Subtask 1: 0 / 100