Submission #1315792

#	Time	Username	Problem	Language	Result	Execution time	Memory
1315792		Zbyszek99	Password (RMI18_password)	C++20	100 / 100	339 ms	556 KiB

password

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
//mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

string guess(int n, int s);
int query(string str);

int cnt[350];

string guess(int n, int k)
{
    vi ans;
    vector<pair<int,char>> vsort;
    rep2(z,'a','a'+k-1)
    {
        string s;
        rep(i,n) s += (char)z;
        cnt[z] = query(s);
        vsort.pb({cnt[z],z});
    }
    sort(all(vsort));
    forall(elm,vsort)
    {
        int c = elm.ff;
        if(siz(ans) == 0)
        {
            rep(i,c) ans.pb(elm.ss);
            continue;
        }
        vi ans2;
        bool was_prev = 0;
        for(int i = siz(ans)-1; i >= 0; i--)
        {
            if(!was_prev && i != 0 && c < i/2+1)
            {
                string q;
                forall(it,ans2) q += (char)it;
                q += (char)ans[i];
                q += (char)ans[i-1];
                rep(j,c) q += elm.ss;
                reverse(all(q));
                int l = query(q);
                if(l == siz(q))
                {
                    ans2.pb(ans[i]);
                    ans2.pb(ans[i-1]);
                    i--;
                    continue;
                }
                else was_prev = 1;
            }
            else was_prev = 0;
            while(true)
            {
                string q;
                forall(it,ans2) q += (char)it;
                q += (char)ans[i];
                rep(j,c) q += elm.ss;
                reverse(all(q));
                if(query(q) == siz(q)) break;
                else
                {
                    ans2.pb(elm.ss);
                    c--;
                }
            }
            ans2.pb(ans[i]);
        }
        rep(j,c) ans2.pb(elm.ss);
        reverse(all(ans2));
        ans = ans2;
    }
    string str_ans;
    forall(it,ans) str_ans += (char)it;
    return str_ans;
}

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