Submission #588931

#	Time	Username	Problem	Language	Result	Execution time	Memory
588931		BT21tata	XOR (IZhO12_xor)	C++17	0 / 100	7 ms	1620 KiB

xor

#include<bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// using namespace __gnu_pbds;
// #pragma GCC target ("avx,avx2,fma")
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
#define SPEED ios_base::sync_with_stdio(false); cin.tie(0), cout.tie(0)
#define rall(v) (v).rbegin(),(v).rend()
#define all(v) (v).begin(),(v).end()
#define setp fixed<<setprecision
#define OK cerr<<"OK"<<endl<<flush
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define F first
#define S second
#define y0 jahdakdh
#define y1 jahsadakdakdh
#define endl '\n'
const ll MOD=1e9+7;
const ll mod=(1ll<<31)-1;
const ld eps=1e-8;
using namespace std;
mt19937 rng(std::chrono::system_clock::now().time_since_epoch().count());

int n, x, pr[250005], l[250005], r[250005], cur=1, pos[250005];

void add(int v, int num, int p, int bit)
{
    pos[v]=min(p, pos[v]);
    if(bit==-1) return;
    if(num&(1<<bit))
    {
        if(!r[v]) r[v]=cur++;
        add(r[v], num, p, bit-1);
    }
    else
    {
        if(!l[v]) l[v]=cur++;
        add(l[v], num, p, bit-1);
    }
}

int fnd(int v, int num, int bit)
{
    if(!v) return MOD;
    if(bit==-1) return pos[v];
    if(x&(1<<bit))
    {
        if(num&(1<<bit))
            return fnd(l[v], num, bit-1);
        else
            return fnd(r[v], num, bit-1);
    }
    else
    {
        return min(fnd(l[v], num, bit-1), fnd(r[v], num, bit-1));
    }
}

int main()
{
    SPEED;
    cin>>n>>x;
    for(int i=1; i<=n; i++)
    {
        int k; cin>>k;
        pr[i]=pr[i-1]^k;
    }
    // pr[r]^pr[l-1]>=x
    int ansl=MOD, sz=0;
    memset(pos, 63, sizeof(pos));
    for(int i=1; i<=n; i++)
    {
        add(1, pr[i], i, 30);
        int e=fnd(1, pr[i], 30);
        if(sz<i-e+1)
        {
            sz=i-e;
            ansl=e+1;
        }
    }
    cout<<ansl<<' '<<sz<<endl;
    return 0;
}

• Subtask 1: 0 / 100