Submission #896694

#	Time	Username	Problem	Language	Result	Execution time	Memory
896694		vgtcross	Xoractive (IZhO19_xoractive)	C++17	100 / 100	3 ms	596 KiB

Xoractive

#include <bits/stdc++.h>

#define MODE 0

#if MODE
#define debug(x) cout << #x << ": " << (x) << endl
#define log(x) cout << (x) << endl
#define test(x) x
#else
#define debug(x)
#define log(x)
#define test(x)
#endif

#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define fi first
#define se second
#define X real()
#define Y imag()

using namespace std;
using ll = long long;
using ld = long double;
using uint = unsigned int;
using ull = unsigned long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using P = complex<ll>;

template<typename S, typename T = S> void chmin(S &s, T t) {s = s < t ? s : t;}
template<typename S, typename T = S> void chmax(S &s, T t) {s = s > t ? s : t;}

const ll M = 1000000007; // 998244353

int ask(int i)
#if MODE == 0
;
#else
{
    cout << "ask " << i << endl;
    int v;
    cin >> v;
    return v;
}
#endif

vector<int> get_pairwise_xor(vector<int> pos)
#if MODE == 0
;
#else
{
    cout << "xor ";
    for (int i : pos) cout << i << ' ';
    cout << endl;
    vector<int> v(pos.size() * pos.size());
    for (int &i : v) cin >> i;
    return v;
}
#endif

vector<int> diff(vector<int> &a, vector<int> &b) {
    sort(all(a));
    sort(all(b));
    vector<int> c;
    int j = 0;
    for (int i = 0; i < a.size(); ++i) {
        if (j < b.size() && a[i] == b[j]) ++j;
        else c.push_back(a[i]);
    }
    return c;
}

vector<int> guess(int n) {
    int x = ask(n);
    map<int, int> mp;
    for (int i = 1; i < n; i *= 2) {
        vector<int> v;
        for (int j = 1; j < n; ++j) if (j & i) v.push_back(j);
        auto a = get_pairwise_xor(v);
        v.push_back(n);
        auto b = get_pairwise_xor(v);
        auto c = diff(b, a);
        for (int j = 1; j < c.size(); j += 2) mp[c[j] ^ x] += i;
    }
    
    vector<int> ans(n);
    ans[n-1] = x;
    for (pii p : mp) ans[p.se-1] = p.fi;
    return ans;
}

#if MODE
int main() {
    cin.tie(0) -> sync_with_stdio(0);
    
    int n;
    cin >> n;
    
    auto ans = guess(n);
    for (int i : ans) cout << i << ' ';
    cout << endl;
    
    return 0;
}
#endif

Compilation message (stderr)

Xoractive.cpp: In function 'std::vector<int> diff(std::vector<int>&, std::vector<int>&)':
Xoractive.cpp:67:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |     for (int i = 0; i < a.size(); ++i) {
      |                     ~~^~~~~~~~~~
Xoractive.cpp:68:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |         if (j < b.size() && a[i] == b[j]) ++j;
      |             ~~^~~~~~~~~~
Xoractive.cpp: In function 'std::vector<int> guess(int)':
Xoractive.cpp:84:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |         for (int j = 1; j < c.size(); j += 2) mp[c[j] ^ x] += i;
      |                         ~~^~~~~~~~~~

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