Submission #715838

#	Time	Username	Problem	Language	Result	Execution time	Memory
715838		TheSahib	Combo (IOI18_combo)	C++17	100 / 100	36 ms	604 KiB

combo

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

using namespace std;

string guess_sequence(int N) {
    vector<char> v = {'A', 'B', 'X', 'Y'};
    string s = "";
    if(press("AB")){
        if(press("A")) s = "A";
        else s = "B";
    }
    else{
        if(press("X")) s = "X";
        else s = "Y";
    }
    v.erase(find(v.begin(), v.end(), s[0]));
    if(N == 1) return s;
    
    while(s.size() < N - 1){
        string a = s + v[0];
        for(int i = 0; i < 3; i++){
            a += s + v[1] + v[i];
        }
        int ans = press(a);
        if(ans == s.size()){
            s.push_back(v[2]);
        }
        else if(ans == s.size() + 1){
            s.push_back(v[0]);
        }
        else{
            s.push_back(v[1]);
        }
    }
    if(press(s + v[0]) == s.size() + 1){
        s.push_back(v[0]);
    }
    else if(press(s + v[1]) == s.size() + 1){
        s.push_back(v[1]);
    }
    else{
        s.push_back(v[2]);
    }
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:20:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   20 |     while(s.size() < N - 1){
      |           ~~~~~~~~~^~~~~~~
combo.cpp:26:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |         if(ans == s.size()){
      |            ~~~~^~~~~~~~~~~
combo.cpp:29:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         else if(ans == s.size() + 1){
      |                 ~~~~^~~~~~~~~~~~~~~
combo.cpp:36:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     if(press(s + v[0]) == s.size() + 1){
      |        ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
combo.cpp:39:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     else if(press(s + v[1]) == s.size() + 1){
      |             ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~

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