Submission #203010

#	Time	Username	Problem	Language	Result	Execution time	Memory
203010		guangxuan	Xoractive (IZhO19_xoractive)	C++14	100 / 100	9 ms	504 KiB

Xoractive

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



unordered_map<int,int> m2vec(vector<int> v,int n){
    unordered_map<int,int> res;
    for(int i=n;i<v.size();i+=2)res[v[i]]++;
    return res;
}

vector<int> getnums(vector<int> pos,int an,int n){
    vector<int> qp;
    for(int i:pos)qp.push_back(i);
    unordered_map<int,int> qr1 = m2vec(get_pairwise_xor(qp),(int)qp.size());
    qp.push_back(n);
    unordered_map<int,int> qr2 = m2vec(get_pairwise_xor(qp),(int)qp.size());
    for(pair<int,int> i:qr1){
        qr2[i.first]-=i.second;
        if(qr2[i.first]==0)qr2.erase(i.first);
    }
    vector<int> nums;
    for(pair<int,int> i:qr2){
        nums.push_back(i.first ^ an);
    }
    return nums;
}

vector<int> guess(int n) {
    int an = ask(n);
    int l2=7;
    unordered_map<int,int> valuetoindex;
    for(int bi=0;bi<l2;bi++){
        vector<int> pos;
        for(int j=1;j<n;j++){
            if(j&(1<<bi)){
                pos.push_back(j);
            }
        }
        if(pos.size()==0)continue;
        vector<int> res = getnums(pos,an,n);
        for(int i:res){
            valuetoindex[i]+=1<<bi;
        }
    }
    vector<int> ans(n);
    ans[n-1] = an;
    for(pair<int,int> i:valuetoindex){
        ans[i.second-1] = i.first;
    }
    return ans;
}

Compilation message (stderr)

Xoractive.cpp: In function 'std::unordered_map<int, int> m2vec(std::vector<int>, int)':
Xoractive.cpp:10:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=n;i<v.size();i+=2)res[v[i]]++;
                 ~^~~~~~~~~

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