Submission #999270

#	Time	Username	Problem	Language	Result	Execution time	Memory
999270		Unforgettablepl	Combo (IOI18_combo)	C++17	100 / 100	28 ms	1668 KiB

combo

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

#define all(x) x.begin(),x.end()

int press(std::string p);

std::string guess_sequence(int N) {
    string curr;
    if(press("AB")){
        if(press("A"))curr="A";
        else curr="B";
    } else {
        if(press("X"))curr="X";
        else curr="Y";
    }
    vector<string> options;
    if(curr[0]!='A')options.emplace_back("A");
    if(curr[0]!='B')options.emplace_back("B");
    if(curr[0]!='X')options.emplace_back("X");
    if(curr[0]!='Y')options.emplace_back("Y");
    for(int i=2;i<N;i++){
        auto ans = press(curr+options[1]+curr+options[2]+options[0]+curr+options[2]+options[1]+curr+options[2]+options[2]);
        if(ans==i)curr+=options[1];
        else if(ans==(i+1))curr+=options[2];
        else curr+=options[0];
    }
    if(N==1)return curr;
    if(press(curr+options[0])==N)curr+=options[0];
    else if(press(curr+options[1])==N)curr+=options[1];
    else curr+=options[2];
    return curr;
}

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