Submission #427654

#	Time	Username	Problem	Language	Result	Execution time	Memory
427654		daanolav	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include <string>

using namespace std;

string characters[4];


std::string guess_sequence(int N) {
    characters[0] = "A";
    characters[1] = "B";
    characters[2] = "X";
    characters[3] = "Y";

    string start = "";
    int res = press("AB");

    if(res >= 1) {
        if(res == 2) {
            start = "AB";
        } else {
            res = press("AX");
            if(res == 0) {
                start = "B";
            } else if(res == 1) {
                start = "A";
            } else {
                start = "AX";
            }
        }
    } else {
        res = press("XA");
        if(res == 0) {
            start = "Y";
        } else if(res == 1) {
            start = "X";
        } else {
            start = "XA";
        }
    }

    cerr << start << endl;
    string first = "" + start.at(0);
    string notFirst[3];
    int i = 0;
    for(string c : characters) {
        if(first == c) {
            continue;
        }
        notFirst[i] = c;
        ++i;
    }

    while(start.size() != N) {
        res = press(start + notFirst[0] + start + notFirst[1] + notFirst[0]);
        if(res == start.size()) {
            start = start + notFirst[2];
        } else if(res == start.size() + 2) {
            start = start + notFirst[1] + notFirst[0];
        } else {
            res = press(start + notFirst[0] + notFirst[0]);
            if(res == start.size()) {
                start = start + notFirst[1];
            } else if(res == start.size() + 2) {
                start = start + notFirst[0] + notFirst[0];
            } else {
                start = start + notFirst[0];
            }
        }
    }


    return "";
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:42:5: error: 'cerr' was not declared in this scope
   42 |     cerr << start << endl;
      |     ^~~~
combo.cpp:2:1: note: 'std::cerr' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
    1 | #include "combo.h"
  +++ |+#include <iostream>
    2 | #include <string>
combo.cpp:42:22: error: 'endl' was not declared in this scope
   42 |     cerr << start << endl;
      |                      ^~~~
combo.cpp:2:1: note: 'std::endl' is defined in header '<ostream>'; did you forget to '#include <ostream>'?
    1 | #include "combo.h"
  +++ |+#include <ostream>
    2 | #include <string>
combo.cpp:54:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   54 |     while(start.size() != N) {
      |           ~~~~~~~~~~~~~^~~~
combo.cpp:56:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |         if(res == start.size()) {
      |            ~~~~^~~~~~~~~~~~~~~
combo.cpp:58:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |         } else if(res == start.size() + 2) {
      |                   ~~~~^~~~~~~~~~~~~~~~~~~
combo.cpp:62:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |             if(res == start.size()) {
      |                ~~~~^~~~~~~~~~~~~~~
combo.cpp:64:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |             } else if(res == start.size() + 2) {
      |                       ~~~~^~~~~~~~~~~~~~~~~~~