Submission #1142520

#	Time	Username	Problem	Language	Result	Execution time	Memory
1142520		fz_00	Combo (IOI18_combo)	C++20	0 / 100	0 ms	408 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std; 
string guess_sequence(int n){
    string p = "";
    set <string> tr;
    tr.insert("A"); tr.insert("B");
    tr.insert("X"); tr.insert("Y");
    int c  = press("AB");
    if(c==1){
        c = press("A");
        if(c==1)p+="A";
        else p+="B";
    }
    else {
        c = press("X");
        if(c==1)p+="X";
        else p+="Y";
    }
    if(n==1)return p;

    string b, x, y;
    c = 0;
    for(string h: tr){
        if(h==p)continue;
        if(c==0)b = h;
        else if(c==1)x = h;
        else y = h;
        c++;
    }
    for(int i=1; i<n-1; i++){
        string t = p+b+p+x+y+p+x+x+p+x+b;
        c = press(t);
        if(c==i)p+=y;
        else if(c==i+1)p+=b;
        else p+=x; 
    }
    c = press(p+b);
    if(c==n)p+=b;
    else{
        c = press(p+x);
        if(c==n)p+=x;
        else p+=y;
    }
    return p;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95