Submission #918704

#	Time	Username	Problem	Language	Result	Execution time	Memory
918704		nasir_bashirov	Password (RMI18_password)	C++17	100 / 100	363 ms	14772 KiB

password

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

#include <bits/stdc++.h>
using namespace std;

#define db long double
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vl vector<ll>
#define vii vector<pii>
#define vll vector<pll>
// #define endl '\n'
#define all(x) x.begin(), x.end()
#define fastio\
    ios_base::sync_with_stdio(0);\
    cin.tie(0);\
    cout.tie(0)\

int query(string str);

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

#define pci pair<char, int>

int memo[26][26][5001];
map<char, int> cnt;
int N;
bool comp(pair<char, int> a, pair<char, int> b){
    if(a.first == b.first){
        return a.second < b.second;
    }
    for(int i=a.second;i<=N;i++){
        if(memo[a.first-'a'][b.first-'a'][i]<=b.second){
            return true;
        }
    }
    for(int i=b.second;i<=N;i++){
        if(memo[b.first-'a'][a.first-'a'][i]<=a.second){
            return false;
        }
    }
    string s = "";
    for(int i = 1; i <= a.second; i++){
        s += a.first;
    }
    for(int i = 1; i <= cnt[b.first] - b.second + 1; i++){
        s += b.first;
    }
    bool ok=(query(s)==(int)s.size());
    if(ok){
        memo[a.first-'a'][b.first-'a'][a.second]=min(memo[a.first-'a'][b.first-'a'][a.second],b.second);
    }
    else{
        memo[b.first-'a'][a.first-'a'][b.second]=min(memo[b.first-'a'][a.first-'a'][b.second],a.second);
    }
    return ok;
}

string guess(int n, int s){
    N=n;
    for(int i=0;i<s;i++){
        for(int j=0;j<s;j++){
            for(int z=1;z<=n;z++){
                memo[i][j][z]=n+1;
            }
        }
    }
    vector<pci> v;
    for(char c = 'a'; c <= char('a'+s-1); c++){
        string s1 = "";
        for(int j = 1; j <= n; j++){
            s1 += c;
        }
        cnt[c] = query(s1);
        for(int j = 1; j <= cnt[c]; j++){
            v.push_back({c, j});
        }
        // cout << c << " : " << cnt[c] << endl;
    }
    shuffle(all(v), rng);
    sort(all(v), comp);
    string res = "";
    for(auto i : v){
        res += i.first;
    }
    return res;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 30 / 30
• Subtask 5: 20 / 20