Submission #514818

#	Time	Username	Problem	Language	Result	Execution time	Memory
514818		Be_dos	XOR (IZhO12_xor)	C++17	100 / 100	262 ms	59436 KiB

xor

#include <iostream>
#include <cmath>
#include <cctype>
#include <vector>
#include <algorithm>
#include <set>
#include <map>
#include <deque>
#include <stack>
#include <unordered_set>
#include <sstream>
#include <cstring>
#include <iomanip>
#include <queue>
#include <unordered_map>
#include <random>
#include <cfloat>
#include <chrono>
#include <bitset>
#include <complex>
#include <immintrin.h>
#include <cassert>

struct Node {
    Node* left = nullptr, *right = nullptr;
    int32_t min = INT32_MAX;
};

#define BITS 30

void add(Node* root, int32_t x, int32_t val) {
    for(int32_t i = BITS - 1; i >= 0; i--) {
        root->min = std::min(root->min, val);
        if(x & (1 << i)) {
            if(root->right == nullptr)
                root->right = new Node;
            root = root->right;
        } else {
            if(root->left == nullptr)
                root->left = new Node;
            root = root->left;
        }
    }
    root->min = std::min(root->min, val);
}

int32_t get_min(Node* root, int32_t x, int32_t not_less_than) {
    int32_t ans = INT32_MAX;
    for(int32_t i = BITS - 1; i >= 0; i--) {
        if(not_less_than & (1 << i)) {
            ;
        } else {
            if(x & (1 << i)) {
                if(root->left != nullptr)
                    ans = std::min(ans, root->left->min);
            } else {
                if(root->right != nullptr)
                    ans = std::min(ans, root->right->min);
            }
        }

        if((not_less_than ^ x) & (1 << i)) {
            if(root->right == nullptr)
                return ans;
            root = root->right;
        } else {
            if(root->left == nullptr)
                return ans;
            root = root->left;
        }
    }
    ans = std::min(ans, root->min);
    return ans;
}

int main() {
    int32_t n, x;
    std::cin >> n >> x;

    int32_t* arr = new int32_t[n];
    for(int32_t i = 0; i < n; i++)
        std::cin >> arr[i];

    int32_t pref_xor = 0;
    Node* root = new Node;
    add(root, 0, 0);
    int32_t left = -1, right = -2;
    for(int32_t i = 0; i < n; i++) {
        pref_xor ^= arr[i];

        int32_t opt = get_min(root, pref_xor, x);
        if(right - left + 1 < i + 1 - opt) {
            left = opt;
            right = i;
        }
        add(root, pref_xor, i + 1);
    }
    std::cout << left + 1 << " " << right - left + 1;
    return 0;
}

• Subtask 1: 100 / 100