Submission #873345

#	Time	Username	Problem	Language	Result	Execution time	Memory
873345		ObadaKh	XOR (IZhO12_xor)	C++17	100 / 100	279 ms	86636 KiB

xor

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

using namespace std;
using namespace __gnu_pbds;
/*-------------------------*/
#define ll long long
#define ld long double
#define all(v) v.begin(),v.end()
#define allr(v) v.rbegin(),v.rend()
#define Dracarys ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
template<typename T> using indexed_multiset = tree<T, null_type, greater_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef pair<ll, int> pi;
const int N = 2e5 + 10;
const int infi = 1e9 + 10;
const ll infl = 1e18 + 10;
const int MOD = 1e9 + 7;
const ld eps = 1e-9;

string ScanString() {
    char ch[100000];
    scanf("%s", ch);
    return ch;
}

const int LOG = 32;

struct TrieNode {
    TrieNode *child[2];
    int Cnt, End, index;

    TrieNode() {
        memset(child, 0, sizeof child);
        Cnt = End = 0;
        index = infi;
    }

    void add(int i, int id, bitset<LOG> &bt) {
        int cur = bt[i];
        if (child[cur] == 0) child[cur] = new TrieNode();
        child[cur]->Cnt++;
        if (child[cur]->index == infi)child[cur]->index = id;
        if (i == 0) {
            child[cur]->End++;
            return;
        }
        child[cur]->add(i - 1, id, bt);
    }

    void add(int num, int id) {
        Cnt++;
        if (index == infi)index = id;
        bitset<LOG> bt(num);
        add(LOG - 1, id, bt);
    }

    int Query(int i, bitset<LOG> p, bitset<LOG> l) {
        if (i == -1)return index;
        int curp = p[i], curl = l[i], ret = infi;
        if (!curp && !curl) {
            if (child[1])ret = child[1]->index;
            if (child[0])ret = min(ret, child[0]->Query(i - 1, p, l));
            return ret;
        }
        if (curp && curl) {
            if (child[0])ret = child[0]->Query(i - 1, p, l);
            return ret;
        }
        if (!curp && curl) {
            if (child[1])return ret = child[1]->Query(i - 1, p, l);
            return ret;
        }
        if (curp && !curl) {
            if (child[0])ret = child[0]->index;
            if (child[1])ret = min(ret, child[1]->Query(i - 1, p, l));
            return ret;
        }
    }

    int Query(int p, int l) {
        bitset<LOG> bt1(p), bt2(l);
        return Query(LOG - 1, bt1, bt2);
    }

    void clear() {
        for (int i = 0; i < 2; i++)
            if (child[i])
                child[i]->clear(), delete child[i], child[i] = 0;
    }
};

void RunTime(int Tc) {
    int n, k;
    cin >> n >> k;
    TrieNode *Root = new TrieNode();
    int pref = 0;
    int res1 = 0, res2 = 0;
    Root->add(0, 0);
    for (int i = 1; i <= n; i++) {
        int x;
        cin >> x;
        pref ^= x;
        Root->add(pref, i);
        int val = Root->Query(pref, k);
        if (val == infi)continue;
        int tmp1 = val + 1, tmp2 = i - val;
        if (tmp2 > res2)res1 = tmp1, res2 = tmp2;
        else if (tmp2 == res2 && tmp1 < res1)res1 = tmp1, res2 = tmp2;
    }
    cout << res1 << ' ' << res2 << endl;
    Root->clear();
    delete Root;
}

int main() {
    Dracarys
    int T = 1;
    //cin >> T;
    for (int Tc = 1; Tc <= T; Tc++) {
        RunTime(Tc);
    }
    return 0;
}

Compilation message (stderr)

xor.cpp: In function 'std::string ScanString()':
xor.cpp:22:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |     scanf("%s", ch);
      |     ~~~~~^~~~~~~~~~
xor.cpp: In member function 'int TrieNode::Query(int, std::bitset<32>, std::bitset<32>)':
xor.cpp:78:5: warning: control reaches end of non-void function [-Wreturn-type]
   78 |     }
      |     ^

• Subtask 1: 100 / 100