Submission #701051

#	Time	Username	Problem	Language	Result	Execution time	Memory
701051		BobCompetitiveProgramming	Combo (IOI18_combo)	C++14	100 / 100	34 ms	792 KiB

combo

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


int press(std::string p);


string guess_sequence(int N){
    string S = "", first, a1, a2, a3;
    if(press("AB")) {
        if(press("A")) first="A", S="A", a1="B", a2="X", a3="Y";
        else first="B", S="B", a1="A", a2="X", a3="Y";
    } else {
        if(press("X")) first="X", S="X", a1="B", a2="A", a3="Y";
        else first="Y", S="Y", a1="B", a2="X", a3="A";
    }

    vector<string> a{a1, a2, a3}; 
        
    while(true){
        int curr_size = S.size();
        if(curr_size == N) 
            return S; 
        
        if(curr_size<=N-2){
            ll nxt = press(S+a1+a1 + S+a1+a2 + S+a1+a3 + S+a2) - curr_size; 
            if(nxt==2) S+=a1;
            if(nxt==1) S+=a2;
            if(nxt==0) S+=a3;
        } else {
            if(press(S+a1+S+a2)>curr_size){
                if(press(S+a1)>curr_size) S+=a1;
                else S+=a2;
            } else
                S+=a3;
        }
    }   
}

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