Submission #439590

#	Time	Username	Problem	Language	Result	Execution time	Memory
439590		mangoesry	Combo (IOI18_combo)	C++14	100 / 100	42 ms	724 KiB

combo

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

string guess_sequence(int N){
    string res,first;
    int first_half = press("AB");
    if(first_half == 0){
        int second_half = press("X");
        first = second_half == 0 ? "Y" : "X";
    }else{
        int second_half = press("A");
        first = second_half == 0 ? "B" : "A";
    }
    res = res + first;
    if(N == 1){
        return res;
    }
    vector<string> chr = {"A","B","X","Y"};
    chr.erase(find(chr.begin(),chr.end(),first));
    for(int i=1;i<N-1;i++){
        string guess = res + chr[0] + chr[0] + res + chr[0] + chr[1] + res + chr[0] + chr[2] + res + chr[1];
        int query = press(guess);
        if(query == res.size()){
            res = res + chr[2];
        }else if(query == res.size()+1){
            res = res + chr[1];
        }else{
            res = res + chr[0];
        }
    }
    int last0 = press(res + chr[0]);
    int last1 = press(res + chr[1]);
    if(last0 == N){
        res = res + chr[0];
    }else if(last1 == N){
        res = res + chr[1];
    }else{
        res = res + chr[2];
    }
    return res;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:24:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |         if(query == res.size()){
      |            ~~~~~~^~~~~~~~~~~~~
combo.cpp:26:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |         }else if(query == res.size()+1){
      |                  ~~~~~~^~~~~~~~~~~~~~~

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