Submission #1302044

#	Time	Username	Problem	Language	Result	Execution time	Memory
1302044		DaciejMaciej	XOR (IZhO12_xor)	C++20	0 / 100	43 ms	91324 KiB

xor

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// #include <ext/rope>

using namespace std;
// using namespace __gnu_pbds;

typedef long long ll;
typedef unsigned long long ull;
typedef unsigned int uint;
typedef long double ld;

template <class T>

using VV = vector<vector<T>>;

using VI = vector<int>;
using VVI = vector<vector<int>>;

using VL = vector<long long>;
using VVL = vector<vector<long long>>;

using VC = vector<char>;
using VVC = vector<vector<char>>;

using VB = vector<bool>;
using VVB = vector<vector<bool>>;

using VD = vector<double>;
using VVD = vector<vector<double>>;

using PII = pair<int, int>;
using PLL = pair<long long, long long>;
using PIL = pair<int, long long>;
using PLI = pair<long long, int>;

using VPII = vector<pair<int, int>>;
using VPLL = vector<pair<long long, long long>>;

#define LINE '\n'
#define SPACE ' '
#define PB push_back
#define FOR(i, a, b) for (int i = (a); i < (int(b)); i++)
#define FORE(i, a, b) for (int i = (a); i <= (int)((b)); i++)
#define ALL(x) x.begin(), x.end()
#define RALL(x) x.rbegin(), x.rend()
#define sq(a) ((a) * (a))
#define sz(x) ((int)x.size())

#define fastio()                      \
    ios_base::sync_with_stdio(false); \
    cin.tie(nullptr);                 \
    cout.tie(nullptr)
#define debug(x) cerr << #x << " = " << x << endl;

const ll MOD = 1e9 + 7;

template <class T>
inline void maxi(T &a, T b)
{
    a = max(a, b);
}

template <class T>
inline void mini(T &a, T b)
{
    a = min(a, b);
}

template <class T>
inline void addi(T &a, T b)
{
    a = (a + b) % MOD;
}

template <class T>
inline void subi(T &a, T b)
{
    a = (a - b + MOD) % MOD;
}

template <class T>
inline T add(T a, T b)
{
    return (a + b) % MOD;
}

template <class T>
inline T sub(T a, T b)
{
    return (a - b + MOD) % MOD;
}

template <class T>
inline T mul(T a, T b)
{
    return ((a % MOD) * (b % MOD)) % MOD;
}

constexpr ll binpow(ll a, ll b, ll mod)
{
    ll res = 1;
    while (b > 0)
    {
        if (b & 1)
        {
            res = (res * a) % mod;
        }
        a = (a * a) % mod;
        b >>= 1;
    }

    return res;
}

const int INF = 1e9;

static const int MAX_N = 250'000;

struct Trie
{
    const static int MAX_W = MAX_N * 31 + 1;
    array<array<int, 2>, MAX_W> next;
    array<int, MAX_W> time;

    int triesz = 0;
    Trie()
    {
        FOR(i, 0, MAX_W)
        next[i].fill(-1);
        fill(ALL(time), 1e7);
    }

    void add(int x, int t)
    {
        int node = 0;
        mini(time[node], t);

        for (int i = 30; i >= 0; i--)
        {
            int bit = (x & (1u << i)) != 0;
            int v = next[node][bit];
            if (v == -1)
            {
                v = ++triesz;
            }
            next[node][bit] = v;
            node = v;
            mini(time[node], t);
        }
    }

    int find(int x, int k)
    {
        int ret = INF;

        int node = 0;
        for (int i = 30; i >= 0; i--)
        {
            int bit_x = (x & (1u << i)) != 0;
            int bit_k = (k & (1u << i)) != 0;

            if (bit_k == 1)
            {
                int v = next[node][bit_x ^ 1];
                if (v == -1)
                    return ret;
                node = v;
            }
            else
            {
                int other = next[node][bit_x ^ 1];
                if (other != -1)
                    mini(ret, time[other]);

                int v = next[node][bit_x];
                if (v == -1)
                    return ret;
                node = v;
            }
        }

        ret = min(ret, time[node]);
        return ret;
    }
};

Trie trie;

void solve()
{
    int n, k;
    cin >> n >> k;

    // len, at i
    PII ans{0, -1};

    int s = 0;
    trie.add(0, 0);
    FOR(i, 0, n)
    {
        int a;
        cin >> a;

        s ^= a;

        trie.add(s, i + 1);
        int ret = trie.find(s, k);

        if (ret != INF)
        {
            int L = i - ret + 1;
            maxi(ans, {L, i + 1});
        }
    }

    cout << ans.second - ans.first + 1 << " " << ans.first << LINE;
}

int main()
{
    fastio();

    int t = 1;
    // cin >> t;

    while (t--)
        solve();
}

• Subtask 1: 0 / 100