Submission #423505

#	Time	Username	Problem	Language	Result	Execution time	Memory
423505		blue	Combo (IOI18_combo)	C++17	100 / 100	40 ms	828 KiB

combo

#include "combo.h"
#include <iostream>
#include <string>
#include <vector>
using namespace std;
 
/*int press(string S)
{
    cout << S << '\n';
    int res;
    cin >> res;
    return res;
}*/
 
string guess_sequence(int N)
{
    string res;
    if(press("AB") >= 1) res = (press("A") == 1 ? "A" : "B");
    else res = (press("X") == 1 ? "X" : "Y");
 
    if(N == 1) return res;
 
    string query;
    int query_res;
 
    vector<string> C;
    for(string t: {"A", "B", "X", "Y"}) if(t != res) C.push_back(t);
 
    while(res.size() < N-1)
    {
        query.clear();
        query = (res + C[0]) + (res + C[1] + C[0]) + (res + C[1] + C[1]) + (res + C[1] + C[2]);
 
        query_res = press(query);
        if(query_res == res.size()) res += C[2];
        else if(query_res == res.size() + 1) res += C[0];
        else res += C[1];
    }
 
    if(press(res + C[0] + res + C[1]) == res.size()) res += C[2];
    else
    {
        if(press(res + C[0]) == res.size() + 1) res += C[0];
        else res += C[1];
    }
    return res;
}
 

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:29:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |     while(res.size() < N-1)
      |           ~~~~~~~~~~~^~~~~
combo.cpp:35:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         if(query_res == res.size()) res += C[2];
      |            ~~~~~~~~~~^~~~~~~~~~~~~
combo.cpp:36:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |         else if(query_res == res.size() + 1) res += C[0];
      |                 ~~~~~~~~~~^~~~~~~~~~~~~~~~~
combo.cpp:40:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |     if(press(res + C[0] + res + C[1]) == res.size()) res += C[2];
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
combo.cpp:43:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         if(press(res + C[0]) == res.size() + 1) res += C[0];
      |            ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~

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