제출 #1178773

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1178773		qrn	XOR (IZhO12_xor)	C++20	0 / 100	2 ms	3392 KiB

xor

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
using namespace std;
// using namespace __gnu_pbds;

// template<class T>
// using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define SPEED ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
#define pb push_back
#define fi first
#define se second

// #define endl "\n"
#define ALL(x) x.begin(), x.end()
#define sz(x) x.size()
#define intt long long

const intt mod = 1e9 + 7;
const intt inf = 1e18;
const intt mxN = 2e5 + 5;

vector<intt> A(mxN), pref(mxN);

struct trie {
    trie* left;
    trie *right;
    set<intt> idx;
    intt data;
    trie () {
        left = nullptr;
        right = nullptr;
        idx.clear();
        data = -1;
    }
};

void add(trie *& root, intt X, intt idxi) {
    trie *node = root;
    for(intt bit = 30; bit >= 0; bit--) {
        node->data = ((1 << bit) & X);
        if((1 << bit) & X) {
            if(node->right == nullptr) {
                node->right = new trie();
            }
            node->idx.insert(idxi);
            node = node->right;
        } else {
            if(node->left == nullptr) {
                node->left = new trie();
            }
            node->idx.insert(idxi);
            node = node->left;
        }
    }
}

intt get(trie *& root, intt X, intt num) {
    intt ret = inf, ret2 = 0;
    trie *node = root;
    for(intt i = 30; i >= 0; i--) {
        intt numbit = ((1 << i) & X) > 0;
        intt Xbit = ((1 << i) & X) > 0;

        // cout << num << " " << i << endl;
        if(Xbit) {
            if(numbit == 0 && node->right == nullptr) return ret;
            if(numbit == 0) node = node->right;
            else node = node = node->left;
            // if(i == 2) cout << "ASDSAD" << endl;
        } else {
            if(numbit == 0 && node->right != nullptr) {
                ret = min(ret, *node->right->idx.begin());
                node = node->left;
            } else if(numbit == 1 && node->left != nullptr) {
                ret = min(ret, *node->left->idx.begin());
                node = node->right;
            }
        }
        // cout << "ASD"<< endl;
        if(node->idx.size() > 0) {
            // cout << "OHA: ";
            // for(auto u : node->idx) cout << u << ":ASDASd"<< endl;
            ret2 = *node->idx.begin();
        }
    }
    return min(ret, ret2);
}

void solve() {
    intt N, x;
    cin >> N >> x;

    A.resize(N);
    for(auto &a : A) cin >> a;

    trie *root = new trie();

    pref.resize(N);
    for(intt i = 0; i < N; i++) {
        pref[i] = A[i];
        if(i) pref[i] ^= pref[i-1];
    }
    // for(intt i : pref) cout << i << " ";
    // cout << endl;

    intt diff = 0, l = 0, r = 0;
    add(root, pref[0], 0);
    for(intt i = 1; i < N; i++) {
        intt for_l = get(root, x, pref[i]);
        // cout << i << ": " << for_l << endl;
        if(for_l == -1) continue;
        if(i - for_l > diff) {
             r = i + 1;
             l = for_l + 1;
             diff = i - for_l;
        }
        add(root, pref[i], i);
    }
    l++;
    cout << l << " " << r-l+1 << endl;
}

signed main() {
    SPEED;
    intt tst = 1;
    // cin >> tst;
    while (tst--) {
        solve();
    }
}

• Subtask 1: 0 / 100