Submission #716488

#	Time	Username	Problem	Language	Result	Execution time	Memory
716488		vjudge1	XOR (IZhO12_xor)	C++17	0 / 100	6 ms	852 KiB

xor

#include <algorithm>
#include <iostream>
#include <iomanip>
#include <bitset>
#include <cmath>
#include <queue>
#include <map>
#include <set>

using namespace std;
typedef long long ll;
struct segment{int l, r, id;
int size(){return r-l+1;}};
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define ent "\n"

const int maxn = 25e4 + 1;
const ll INF = (1ll<<61);
const int MOD = 1e9 + 7;
const int inf = (1<<30);
const int maxl = 20;
const int P = 31;

int n, x, sz;
int nxt[maxn * 30][2];
int a[maxn], mn[maxn * 30];

void add(int x, int num){
    int v = 0;
    for(int i = 29; i >= 0; i--){
        int c = (x >> i) & 1;
        if(!nxt[v][c]) nxt[v][c] = ++sz, mn[sz] = inf;
        v = nxt[v][c];
        mn[v] = min(mn[v], num);
    }
}

void test(){
    cin >> n >> x;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        a[i] ^= a[i-1];
    }
    add(0, 0);
    int ansi = -1, ansk = 0;
    for(int i = 1; i <= n; i++){
        int v = 0; int l = inf;
        for(int k = 29; k >= 0; k--){
            int c = (a[i] >> k) & 1;
            int e = (x >> k) & 1;
            if(e == 0 && nxt[v][c ^ 1]) l = min(l, mn[nxt[v][c ^ 1]]);
            if(!nxt[v][c ^ e]) break;
            v = nxt[v][c ^ e];
            if(k == 0) l = min(l, mn[v]);
        }
        if(ansk < i - l + 1){
            ansi = l + 1;
            ansk = i - l;
        }
        add(a[i], i);
    }
    cout << ansi << ' ' << ansk;
}

int main(){
    ios_base::sync_with_stdio(0); 
    cin.tie(0), cout.tie(0);
    int t; t = 1;
    while(t--) test();
}

• Subtask 1: 0 / 100