Submission #424421

#	Time	Username	Problem	Language	Result	Execution time	Memory
424421		arneves	Combo (IOI18_combo)	C++17	100 / 100	36 ms	700 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
 
typedef long long ll;
 
#define pb push_back
#define f first
#define s second
#define all(x) x.begin(), x.end()
 
const int MOD = 1'000'000'007;
const int MX = 400'005;
//long double PI = 3.14159265358979323846264338327950;
 
const string k="ABXY";
 
int pergunta(string s){
    int ans=0;
    int r=press(s+k[0]+s+k[1]);
    if(r==(int)s.length())ans+=2;
    r=press(s+k[0]+s+k[2]);
    if(r==(int)s.length())ans+=1;
    return ans;
}
 
string guess_sequence(int N) {
    int id[4];
    string ans;
    for(int i=0; i<4; i++) id[i]=i;
    int y=pergunta("");
    ans+=k[y];
    if(N==1) return ans;
    swap(id[y],id[3]);
    for(int i=1; i<N-1; i++){
        string perg;
        perg+=ans+k[id[1]];
        perg+=ans+k[id[2]]+k[id[0]];
        perg+=ans+k[id[2]]+k[id[1]];
        perg+=ans+k[id[2]]+k[id[2]];
        y=press(perg);
        if(y==(int)ans.length()){
            ans+=k[id[0]];
        }else if(y==(int)ans.length()+1){
            ans+=k[id[1]];
        }else{
            ans+=k[id[2]];
        }
    }
    y=pergunta(ans);
    ans+=k[y];
    return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95