Submission #885824

#	Time	Username	Problem	Language	Result	Execution time	Memory
885824		sq00	Combo (IOI18_combo)	C++14	97 / 100	13 ms	1764 KiB

combo

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

using namespace std;

string guess_sequence(int N) {
  string buttons = "", firstBtn = "";
    int aCost = press("AX");
    if(aCost == 2) {
        firstBtn = "A";
        buttons = "BYX";
    } else if(aCost == 1) {
        aCost = press("A");
        if(aCost == 1) {
            firstBtn = "A";
            buttons = "BYX";
        } else {
            firstBtn = "X";
            buttons = "ABY";
        }
    } else {
        int bCost = press("BY");
        if(bCost == 2) {
            firstBtn = "B";
            buttons = "AYX";
        } else {
            aCost = press("B");
            if(aCost == 1) {
                firstBtn = "B";
                buttons = "AYX";
            } else {
                firstBtn = "Y";
                buttons = "ABX";
            }
        }
    }
    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(current.size() + 1 < N) {
                current += buttons[i + 2];
                break;
            }
            if(i == 1) {
                current += buttons[2];
                break;
            }
        }
        if(current.size() == N) break;
    }
    return current;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:38:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   38 |     if(current.size() == N) return current;
      |        ~~~~~~~~~~~~~~~^~~~
combo.cpp:42:28: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   42 |             if(test.size() < N) {
      |                ~~~~~~~~~~~~^~~
combo.cpp:48:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |             if(cost == current.size() + 1) {
      |                ~~~~~^~~~~~~~~~~~~~~~~~~~~
combo.cpp:51:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |             } else if(cost == current.size() + 2) {
      |                       ~~~~~^~~~~~~~~~~~~~~~~~~~~
combo.cpp:54:42: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   54 |             } else if(current.size() + 1 < N) {
      |                       ~~~~~~~~~~~~~~~~~~~^~~
combo.cpp:63:27: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   63 |         if(current.size() == N) break;
      |            ~~~~~~~~~~~~~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95