Submission #941037

#	Time	Username	Problem	Language	Result	Execution time	Memory
941037		Tuanlinh123	Toxic Gene (NOI23_toxic)	C++17	98.65 / 100	14 ms	516 KiB

toxic

#include "toxic.h"
#include<bits/stdc++.h>
#define ll int
#define pll pair<ll, ll>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define ld long double
#define sz(a) ((ll)(a).size())
using namespace std;
mt19937_64 rng(170306);
 
void determine_type(ll n)
{
    vector <char> ans(n+1, 0);
    vector <ll> idx(n);
    iota(idx.begin(), idx.end(), 1);
    shuffle(idx.begin(), idx.end(), rng);
    ll len=8, toxic=0, cnt=30;
    auto queryran=[&](ll l, ll r)
    {
        vector <ll> ask;
        for (ll i=l; i<=r; i++)
            ask.pb(idx[i]);
        return query_sample(ask);
    };
    vector <ll> ask1;
    while (sz(idx) && cnt)
    {
        vector <ll> left;
        for (ll i=0; i<8 && sz(idx); i++)
            left.pb(idx.back()), idx.pop_back();
        vector <ll> ask;
        for (ll j=0; j<sz(left); j++)
            for (ll k=0; k<1<<j; k++)
                ask.pb(left[j]);
        ll x=query_sample(ask);
        if (x==ask.size())
        {
            for (ll i:left) ask1.pb(i);
            continue;
        }
        vector <ll> left1;
        for (ll j=0; j<sz(left); j++)
        {
            if (x&1<<j) ans[left[j]]='S';
            else left1.pb(left[j]);
        }
        ll p=0, en=sz(left1)-1;
        auto queryran=[&](ll l, ll r)
        {
            vector <ll> ask;
            for (ll i=l; i<=r; i++)
                ask.pb(left1[i]);
            vector <ll> id;
            for (ll k=0; k<len; k++)
            {
                if (!sz(ask1)) break;
                id.pb(ask1.back()), ask1.pop_back();
                for (ll h=0; h<1<<k; h++)
                    ask.pb(id.back());
            }
            ll x=query_sample(ask);
            if (x==sz(ask))
            {
                for (ll i:id) ask1.pb(i);
                return true;
            }
            for (ll i=0; i<sz(id); i++)
            {
                if (x&1<<i) ans[id[i]]='S';
                else ans[id[i]]='R';
            }
            return false;
        };
        ll lo=0, hi=en;
        while (hi>lo)
        {
            ll mid=(lo+hi)/2;
            bool res=queryran(lo, mid);
            if (res) lo=mid+1;
            else hi=mid;
        }
        ans[left1[lo]]='T', cnt--, toxic=left1[lo];
        for (ll j=0; j<lo; j++) ans[left1[j]]='R';
        for (ll j=lo+1; j<sz(left1); j++) idx.pb(left1[j]);
    }
    idx.clear();
    for (ll i=1; i<=n; i++)
        if (!ans[i]) idx.pb(i);
    shuffle(idx.begin(), idx.end(), rng);
    for (ll i=0; i<sz(idx); i+=len)
    {
        vector <ll> ask; ask.pb(toxic);
        for (ll j=i; j<sz(idx) && j<i+len; j++)
            for (ll k=0; k<1<<(j-i); k++)
                ask.pb(idx[j]);
        ll x=query_sample(ask);
        for (ll j=i; j<sz(idx) && j<i+len; j++)
        {
            if (x&1<<(j-i)) ans[idx[j]]='S';
            else ans[idx[j]]='R';
        }
    }
    for (ll i=1; i<=n; i++)
        answer_type(i, ans[i]);
}

Compilation message (stderr)

toxic.cpp: In function 'void determine_type(int)':
toxic.cpp:39:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |         if (x==ask.size())
      |             ~^~~~~~~~~~~~
toxic.cpp:50:12: warning: unused variable 'p' [-Wunused-variable]
   50 |         ll p=0, en=sz(left1)-1;
      |            ^
toxic.cpp:21:10: warning: variable 'queryran' set but not used [-Wunused-but-set-variable]
   21 |     auto queryran=[&](ll l, ll r)
      |          ^~~~~~~~

• Subtask 1: 98.65 / 100