Submission #1127583

#	Time	Username	Problem	Language	Result	Execution time	Memory
1127583		Elwino008	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

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

using namespace std;

#define pb push_back
#define all(v) v.begin(), v.end()

mt19937 random(time(NULL));

string f(string a, int N, char st){
    int n=a.size();
    if(n==N-1){
        return a;
    }
    string q="";
    if(st=='A'){
        q+=a;
        q+='B';
        q+=a;
        q+="XB";
        q+=a;
        q+="XX";
        q+=a;
        q+="XY";
        int qwe=press(q);
        if(qwe==n){
            a+='Y';
        }
        else if(qwe==n+1){
            a+='B';
        }
        else{
            a+='X';
        }
    }
    else if(st=='B'){
        q+=a;
        q+='A';
        q+=a;
        q+="XA";
        q+=a;
        q+="XX";
        q+=a;
        q+="XY";
        int qwe=press(q);
        if(qwe==n){
            a+='Y';
        }
        else if(qwe==n+1){
            a+='A';
        }
        else{
            a+='X';
        }
    }
    else if(st=='X'){
        q+=a;
        q+='A';
        q+=a;
        q+="BA";
        q+=a;
        q+="BB";
        q+=a;
        q+="BY";
        int qwe=press(q);
        if(qwe==n){
            a+='Y';
        }
        else if(qwe==n+1){
            a+='A';
        }
        else{
            a+='B';
        }
    }
    else{
        q+=a;
        q+='A';
        q+=a;
        q+="BA";
        q+=a;
        q+="BB";
        q+=a;
        q+="BX";
        int qwe=press(q);
        if(qwe==n){
            a+='X';
        }
        else if(qwe==n+1){
            a+='A';
        }
        else{
            a+='B';
        }
    }
    return f(a, N, st);

}

std::string guess_sequence(int N) {
    vector<string>strt;
    strt.pb("A");
    strt.pb("X");
    strt.pb("Y");
    strt.pb("B");
    sort(all(strt));
    shuffle(all(strt), random);
    char st;
    string a="";
    int ind=0;
    int q=press(strt[ind]);
    while(q!=1){
        ind++;
        if(ind==3){
            break;
        }
        q=press(strt[ind]);
    }
    st=strt[ind][0];
    a+=st;
    string ans=f(a, N, st);
    ind=0;
    shuffle(all(strt), random);
    q=press(ans+strt[ind]);
    while(q!=N){
        ind++;
        if(ind==3){
            break;
        }
        q=press(strt[ind]);
    }
    ans+=strt[ind];
    return ans;
}

Compilation message (stderr)

combo.cpp:9:16: error: 'std::mt19937 random' redeclared as different kind of entity
    9 | mt19937 random(time(NULL));
      |                ^~~~
In file included from /usr/include/c++/11/cstdlib:75,
                 from /usr/include/c++/11/bits/stl_algo.h:59,
                 from /usr/include/c++/11/string:52,
                 from combo.h:3,
                 from combo.cpp:1:
/usr/include/stdlib.h:402:17: note: previous declaration 'long int random()'
  402 | extern long int random (void) __THROW;
      |                 ^~~~~~
In file included from /usr/include/c++/11/string:52,
                 from combo.h:3,
                 from combo.cpp:1:
/usr/include/c++/11/bits/stl_algo.h: In instantiation of 'void std::shuffle(_RAIter, _RAIter, _UGenerator&&) [with _RAIter = __gnu_cxx::__normal_iterator<std::__cxx11::basic_string<char>*, std::vector<std::__cxx11::basic_string<char> > >; _UGenerator = long int (&)() noexcept]':
combo.cpp:108:12:   required from here
/usr/include/c++/11/bits/stl_algo.h:3750:9: error: 'std::remove_reference<long int (&)() noexcept>::type' {aka 'long int() noexcept'} is not a class, struct, or union type
 3750 |         __uc_type;
      |         ^~~~~~~~~
/usr/include/c++/11/bits/stl_algo.h:3778:44: error: 'std::remove_reference<long int (&)() noexcept>::type' {aka 'long int() noexcept'} is not a class, struct, or union type
 3778 |           const pair<__uc_type, __uc_type> __pospos =
      |                                            ^~~~~~~~
/usr/include/c++/11/bits/stl_algo.h:3778:44: error: 'std::remove_reference<long int (&)() noexcept>::type' {aka 'long int() noexcept'} is not a class, struct, or union type