Submission #701021

#	Time	Username	Problem	Language	Result	Execution time	Memory
701021		BobCompetitiveProgramming	Combo (IOI18_combo)	C++14	10 / 100	53 ms	572 KiB

combo

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

/*
int press(string s){
    cout << " IN PRESS, ans with string s =  " << s << endl;
    ll ret; cin>>ret;
    return ret;
}
*/

int press(std::string p);

string guess_sequence(int N){
    string S = "", first;
    vector<string> buttons{"A", "B", "X", "Y"};
    for(auto& button : buttons)
        if(button=="Y" || press(button)){
            first = button, S += button;
            break;
        }
    while(true){
        if(S.size() == N) 
            return S; 
        
        for(auto& button : buttons) {
            if(button == first)
                continue;
            if(button=="Y" || press(S + button) > S.size()) {
                S += button;
                break;
            }
        }
    }   
}

/*
int main(){
    guess_sequence(5);
}
*/

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:23:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   23 |         if(S.size() == N)
      |            ~~~~~~~~~^~~~
combo.cpp:29:49: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |             if(button=="Y" || press(S + button) > S.size()) {
      |                               ~~~~~~~~~~~~~~~~~~^~~~~~~~~~

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