Submission #372746

#	Time	Username	Problem	Language	Result	Execution time	Memory
372746		Carmel_Ab1	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
//#include "grader.cpp"
using namespace std;
string guess_sequence(int n) {
    string ans;
    for(int rep=0; rep<2; rep++)
        for(char c:"ABXY")
            if(press(ans+c)==ans.size()+1){
                ans+=c;
                break;
            }
    while(ans.size()!=n){
        set<char>s;
        for(char c:"ABXY")s.insert(c);
        s.erase(s[0]);
        s.erase(ans.back());
        char c1=*s.begin();
        s.erase(c1);
        char c2=*s.begin();

        string guess=ans+c1;
        for(char p1:{c1,c2,s.back()})
            guess+=ans+c2+p1;
        if(press(guess)==ans.size()+1)
            ans+=c1;
        else
            ans+=c2;
    }
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:9:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |             if(press(ans+c)==ans.size()+1){
      |                ~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:13:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   13 |     while(ans.size()!=n){
      |           ~~~~~~~~~~^~~
combo.cpp:16:18: error: no match for 'operator[]' (operand types are 'std::set<char>' and 'int')
   16 |         s.erase(s[0]);
      |                  ^
combo.cpp:23:30: error: 'class std::set<char>' has no member named 'back'
   23 |         for(char p1:{c1,c2,s.back()})
      |                              ^~~~
combo.cpp:23:36: error: unable to deduce 'std::initializer_list<auto>&&' from '{c1, c2, <expression error>}'
   23 |         for(char p1:{c1,c2,s.back()})
      |                                    ^
combo.cpp:25:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         if(press(guess)==ans.size()+1)
      |            ~~~~~~~~~~~~^~~~~~~~~~~~~~