Submission #589510

#	Time	Username	Problem	Language	Result	Execution time	Memory
589510		TheEvilBird	XOR (IZhO12_xor)	C++17	0 / 100	1 ms	212 KiB

xor

#include <iostream>
#include <iomanip>
#include <cassert>
#include <vector>
#include <numeric>
#include <string>
#include <bitset>
#include <cmath>
#include <algorithm>
#include <stack>
#include <queue>
#include <deque>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <random>
#include <ctime>
#include <chrono>

using namespace std;

#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) (int)((x).size())

typedef unsigned int uint;
typedef long long ll;
typedef unsigned long long ull;
//typedef __int128_t int128;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const char en = '\n';
const int INF = 1e9 + 7;
const ll INFLL = 1e18;

mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());

#ifdef __APPLE__
#include "debug.h"
//#define debug(...) 42
#else
#define debug(...) 42
#endif

const int N = 250'000;
const int LOG = 4;

int get_mask(int mask, int i) {
    return (mask & (1 << i));
}

void solve() {
    int n, x;
    cin >> n >> x;
    vector<int> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }
    vector<vector<int>> dp(n, vector<int> (LOG, -1));
    for (int l = 0; l < LOG; ++l) {
        int last = n, cnt = 0;
        for (int i = n - 1; i >= 0; --i) {
            if (get_mask(a[i], l)) {
                ++cnt;
            }
            if (cnt == 0) {
                continue;
            }
            if (cnt == 1) {
                last = i;
            }
            if (cnt % 2 == 1) {
                dp[i][l] = n - 1;
            }
            else {
                dp[i][l] = last;
            }
        }
    }

    int ans = -1, idans = -1;

    auto chkmx = [&](int cur, int i) {
        if (cur > ans) {
            ans = cur;
            idans = i + 1;
        }
    };

    for (int i = 0; i < n; ++i) {
        int now = n - i;
        for (int l = LOG - 1; l >= 0; --l) {
            if (get_mask(x, l)) {
                now = min(now, dp[i][l]);
            }
            else {
                int cur = now;
                cur = min(cur, dp[i][l]);
                chkmx(cur, i);
            }
        }
        chkmx(now, i);
    }
    assert(ans != -1);
    cout << idans << ' ' << ans << en;
}

int main() {
#ifdef __APPLE__
    freopen("input.txt", "r", stdin);
#else
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#endif
    solve();
    return 0;
}

• Subtask 1: 0 / 100