Submission #685109

#	Time	Username	Problem	Language	Result	Execution time	Memory
685109		gagik_2007	Xoractive (IZhO19_xoractive)	C++17	100 / 100	4 ms	396 KiB

Xoractive

#include "interactive.h"
#include <map>
using namespace std;

vector<int>sub(vector<int>a, vector<int>b) {
    map<int, int>m;
    for (int i : a)m[i]++;
    for (int j : b)m[j]--;
    vector<int>ans;
    for (pair<int, int>p : m) {
        for (int i = 0; i < p.second; i++)ans.push_back(p.first);
    }
    return ans;
}

vector<int> guess(int n) {
    map<int, int>m;
    int x = ask(1);
    for (int i = 6; i >= 0; i--) {
        vector<int>askk;
        for (int j = 2; j <= n; j++) {
            if (j & (1 << i))askk.push_back(j);
        }
        if (askk.size() == 0)continue;
        vector<int>first = get_pairwise_xor(askk);
        askk.push_back(1);
        vector<int>second = get_pairwise_xor(askk);
        second = sub(second, first);
        for (int j = 0; j < second.size(); j++) {
            second[j] ^= x;
            m[second[j]] |= (1 << i);
        }
    }
    int anss[1001];
    for (pair<int, int>p : m) {
        anss[p.second] = p.first;
    }
    anss[1] = x;
    vector<int> ans;
    for (int i = 1; i <= n; i++) {
        ans.push_back(anss[i]);
    }
    return ans;
}

Compilation message (stderr)

Xoractive.cpp: In function 'std::vector<int> guess(int)':
Xoractive.cpp:29:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         for (int j = 0; j < second.size(); j++) {
      |                         ~~^~~~~~~~~~~~~~~

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