Submission #885800

#	Time	Username	Problem	Language	Result	Execution time	Memory
885800		sq00	Combo (IOI18_combo)	C++17	10 / 100	27 ms	1924 KiB

combo

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

using namespace std;

string guess_sequence(int N) {
  string buttons = "", firstBtn = "";
    if(press("A") == 1) {
        firstBtn = "A";
        buttons = "BYX";
    }
    else if(press("B") == 1) {
        firstBtn = "B";
        buttons = "AYX";
    }
    else if(press("Y") == 1) {
        firstBtn = "Y";
        buttons = "ABX";
    } else {
        firstBtn = "X";
        buttons = "ABY";
    }
    string current = firstBtn;
    if(current.size() == N) return current;
    while(true) {
        for(int i = 0; i < (int)buttons.size(); i++) {
            string test = current + buttons[i];
            if(test.size() < N) {
                for(int j = 0; j < (int)buttons.size(); j++) {
                    test += current + buttons[i + 1] + buttons[j];
                }
            }
            int cost = press(test);
            if(cost == current.size() + 1) {
                current += buttons[i];
                break;
            } else if(cost == current.size() + 2) {
                current += buttons[i + 1];
                break;
            } else if(cost > current.size()) {
                current += buttons[i + 2];
                break;
            }
        }
        if(current.size() == N) break;
    }
    return current;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:24:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |     if(current.size() == N) return current;
      |        ~~~~~~~~~~~~~~~^~~~
combo.cpp:28:28: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   28 |             if(test.size() < N) {
      |                ~~~~~~~~~~~~^~~
combo.cpp:34:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |             if(cost == current.size() + 1) {
      |                ~~~~~^~~~~~~~~~~~~~~~~~~~~
combo.cpp:37:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |             } else if(cost == current.size() + 2) {
      |                       ~~~~~^~~~~~~~~~~~~~~~~~~~~
combo.cpp:40:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |             } else if(cost > current.size()) {
      |                       ~~~~~^~~~~~~~~~~~~~~~
combo.cpp:45:27: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   45 |         if(current.size() == N) break;
      |            ~~~~~~~~~~~~~~~^~~~

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