Submission #1178768

#	Time	Username	Problem	Language	Result	Execution time	Memory
1178768		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;
    trie *node = root;
    for(intt i = 30; i >= 0; i--) {
        intt numbit = (((1 << i) & num) > 0);
        if(((1 << i) & X) == 0) {
            if(numbit == 0) {
                if(node->right != nullptr) {
                    if(num == 1) cout << i << endl;
                    return *node->idx.begin();
                } else {
                    if(node->idx.size() > 0) ret = min(ret, *node->idx.begin());
                    node = node->left;
                }
            } else {
                if(node->left != nullptr) {
                    // if(num == 1) cout << i << endl;
                    return *node->idx.begin();
                } else {
                    if(node->idx.size() > 0) ret = min(ret, *node->idx.begin());
                    node = node->right;
                }
            }
        } else {
            if(numbit == 1) {
                if(node->left == nullptr) {
                    return -1;
                } else {
                    if(node->idx.size() > 0) ret = min(ret, *node->idx.begin());
                    node = node->left;
                }
            } else {
                if(node->right == nullptr) {
                    return -1;
                } else {
                    if(node->idx.size() > 0) ret = min(ret, *node->idx.begin());
                    node = node->right;
                }
            }
        }
    }
    return ret;
}

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