Submission #344909

#	Time	Username	Problem	Language	Result	Execution time	Memory
344909		IZhO_2021_I_want_Silver	Xoractive (IZhO19_xoractive)	C++14	100 / 100	5 ms	512 KiB

Xoractive

#include "interactive.h"

#include <vector>
#include <map>

#define pii pair <int, int>
#define F first
#define S second
#define pb push_back

using namespace std;

vector<int> guess(int n) {
    vector <int> ans(n);
    ans[0] = ask(1);
    map <int, int> ans_pos;
    for (int bit = 0; (1 << bit) <= n; ++bit) {
        vector <int> pos;
        for (int i = 2; i <= n; ++i) {
            if ((i >> bit) & 1) pos.pb(i);
        }
        vector <int> q1 = get_pairwise_xor(pos);
        pos.pb(1);
        vector <int> q2 = get_pairwise_xor(pos);
        map <int, int> cnt;
        for (int x : q2) ++cnt[x];
        for (int x : q1) --cnt[x];
        for (pii p : cnt) {
            if (p.F != 0 && p.S != 0) ans_pos[(p.F ^ ans[0])] += (1 << bit);
        }
        pos.clear();
        q1.clear();
        q2.clear();
        cnt.clear();
    }
    for (pii p : ans_pos) {
        ans[p.S - 1] = p.F;
    }
    return ans;
}

• Subtask 1: 6 / 6
• Subtask 2: 94 / 94