Submission #90816

#	Time	Username	Problem	Language	Result	Execution time	Memory
90816		tpoppo	Combo (IOI18_combo)	C++14	5 / 100	2 ms	200 KiB

combo

#include<bits/stdc++.h>
#include "combo.h"

using namespace std;

int n;
string pref;
vector<string> valid ={"A","B","X","Y"};

void get_next(){
    string t1 = pref + valid[1];
    for(int i=0;i<3;i++)
        t1 += pref + valid[2] + valid[i];
    pref += valid[press(t1) - (int) pref.size()];
}


void last(){
    if(press(pref + valid[0] + pref + valid[1]) == pref.size()+1){
        if(press(pref + valid[0]) == pref.size()+1){
            pref += valid[0];
        }else{
            pref += valid[1];
        }
    }else{
        pref += valid[2];
    }
}
string guess_sequence(int N) {
    n = N;
    if(press("AB")){
        if(press("A")){
            pref = "A";
            valid.erase(valid.begin());
        }else{
            pref = "B";
            valid.erase(valid.begin()+1);
        }
    }else{
        if(press("X")){
            pref = "X";
            valid.erase(valid.begin()+2);
        }else{
            pref = "Y";
            valid.erase(valid.begin()+3);
        }
    }
    for(int i=1;i<n-1;i++) get_next();
    last();

    return pref;
}

Compilation message (stderr)

combo.cpp: In function 'void last()':
combo.cpp:19:49: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     if(press(pref + valid[0] + pref + valid[1]) == pref.size()+1){
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
combo.cpp:20:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |         if(press(pref + valid[0]) == pref.size()+1){
      |            ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~

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