Submission #1051115

#	Time	Username	Problem	Language	Result	Execution time	Memory
1051115		sofija6	XOR (IZhO12_xor)	C++14	0 / 100	1 ms	2396 KiB

xor

#include <bits/stdc++.h>
#define ll long long
#define MAXN 250010
using namespace std;
ll a[MAXN],pref[MAXN];
map<ll,ll> pos;
int main()
{
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    ll n,x,ansi=0,ansk=-1;
    cin >> n >> x;
    for (ll i=1;i<=n;i++)
    {
        cin >> a[i];
        pref[i]=pref[i-1]^a[i];
    }
    for (ll i=n;i>=0;i--)
    {
        ll val=0;
        for (ll j=30;j>=0;j--)
        {
            if ((1ll<<j)&x)
            {
                if (!((1ll<<j)&pref[i]))
                    val+=(1ll<<j);
                continue;
            }
            if (!((1ll<<j)&pref[i]))
                val+=(1ll<<j);
            if (pos[val]-i>ansk)
            {
                ansk=pos[val]-i;
                ansi=i+1;
            }
            else if (pos[val]-i==ansk)
                ansi=i+1;
            val^=(1ll<<j);
        }
        if (pos[val]-i>ansk)
        {
            ansk=pos[val]-i;
            ansi=i+1;
        }
        else if (pos[val]-i==ansk)
            ansi=i+1;
        if (!pos[pref[i]])
            pos[pref[i]]=i;
        for (ll j=0;j<=30;j++)
        {
            if ((1ll<<j)&pref[i])
                pref[i]-=(1ll<<j);
            if (!pos[pref[i]])
                pos[pref[i]]=i;
        }
    }
    cout << ansi << " " << ansk;
    return 0;
}

• Subtask 1: 0 / 100