Submission #785060

#	Time	Username	Problem	Language	Result	Execution time	Memory
785060		Hanksburger	Xoractive (IZhO19_xoractive)	C++17	100 / 100	3 ms	464 KiB

Xoractive

#include "interactive.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> res[7], v, p, q, t;
vector<int> guess(int n)
{
    int x=ask(1);
    for (int i=0; i<=6; i++)
    {
        t.clear();
        for (int j=2; j<=n; j++)
            if (j&(1<<i))
                t.push_back(j);
        if (t.empty())
            p.clear();
        else
            p=get_pairwise_xor(t);
        t.push_back(1);
        q=get_pairwise_xor(t);
        for (int u:p)
            q.erase(lower_bound(q.begin(), q.end(), u));
        for (int j=1; j<q.size(); j+=2)
        {
            v.push_back(q[j]^x);
            res[i].push_back(q[j]^x);
        }
    }
    sort(v.begin(), v.end());
    v.resize(unique(v.begin(), v.end())-v.begin());
    vector<int> ans(n);
    ans[0]=x;
    for (int u:v)
    {
        int ind=0;
        for (int i=0; i<=6; i++)
            if (find(res[i].begin(), res[i].end(), u)!=res[i].end())
                ind|=1<<i;
        ans[ind-1]=u;
    }
    return ans;
}

Compilation message (stderr)

Xoractive.cpp: In function 'std::vector<int> guess(int)':
Xoractive.cpp:22:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         for (int j=1; j<q.size(); j+=2)
      |                       ~^~~~~~~~~

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