#include <iostream>
#include <vector>
#include <iomanip>
#include <algorithm>
#include <cassert>
#include <map>
#include <complex>
#include <cmath>
#include <stdio.h>
#include <string.h>
#include <set>
#include <queue>
#include"interactive.h"
using namespace std;
vector<int> reduce (vector<int> v) {
map<int,int> cnt;
for (int i: v) {
cnt[i]++;
}
cnt[0] = 0;
v.clear();
for (auto& p: cnt) {
p.second /= 2;
while (p.second--) {
v.push_back(p.first);
}
}
return v;
}
int beginning;
vector<int> permutation (vector<int> indices, int n) {
vector<int> v1 = reduce(get_pairwise_xor(indices));
indices.push_back(n - 1);
vector<int> v2 = reduce(get_pairwise_xor(indices));
map<int,int> cnt;
for (int i: v2) cnt[i]++;
for (int i: v1) cnt[i]--;
vector<int> v;
for (auto& p: cnt) {
if (p.second)
v.push_back(p.first ^ beginning);
}
sort(v.begin(), v.end());
return v;
}
vector<int> solve (int n) {
beginning = ask(n);
map<int,int> m;
for (int i = 0; i < 7; i++) {
vector<int> x;
for (int j = 0; j < n - 1; j++) {
if ((j + 1) & (1 << i)) {
x.push_back(j + 1);
}
}
vector<int> a = permutation(x, n);
for (int val: a) {
m[val] |= (1 << i);
}
}
vector<int> ans(n);
for (auto& p: m) {
ans[p.second - 1] = p.first;
}
return ans;
}
Compilation message
/usr/bin/ld: /tmp/ccCj04uy.o: in function `main':
grader.cpp:(.text.startup+0xdc): undefined reference to `guess(int)'
collect2: error: ld returned 1 exit status
