Submission #485493

#	Time	Username	Problem	Language	Result	Execution time	Memory
485493		Joo	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
using namespace std;

/*int press(string p){
    cout << p << "\n";
    int x; cin >> x; return x;
}*/

string guess_sequence(int N){
    string str;
    vector<char> a = {'A', 'B', 'X', 'Y'};

    if(press("AB") == 0){ ///either x or y
        if(press("X") == 1){
            str += 'X';
            a.erase(a.begin()+2);
        }else{
            str += 'Y';
            a.erase(a.begin()+3);
        }
    }else{ ///either a or b
        if(press("A") == 1){
            str += 'A';
            a.erase(a.begin());
        }else{
            str += 'B';
            a.erase(a.begin()+1);
        }
    }

    for(int i = 2; i < N; i++){
        string tmp = str + a[1] + str + a[2] + a[0] + str + a[2] + a[1] + str + a[2] + a[2];
        int res = press(tmp);

        if(res == str.size()){ ///got nothing new
            str += a[0];
        }else if(res == str.size()+1){
            str += a[1];
        }else{
            str += a[2];
        }
    }

    if(press(str+a[0]) == N){
        str += a[0];
    }else if(press(str+a[1]) == N){
        str += a[1];
    }else{
        str += a[2];
    }

    return str;
}

/*
int main(void){
    cout << guess_sequence(5) << "\n";
    return 0;
}
*/

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:13:8: error: 'press' was not declared in this scope
   13 |     if(press("AB") == 0){ ///either x or y
      |        ^~~~~
combo.cpp:33:19: error: 'press' was not declared in this scope; did you mean 'res'?
   33 |         int res = press(tmp);
      |                   ^~~~~
      |                   res
combo.cpp:35:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         if(res == str.size()){ ///got nothing new
      |            ~~~~^~~~~~~~~~~~~
combo.cpp:37:22: 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(res == str.size()+1){
      |                  ~~~~^~~~~~~~~~~~~~~
combo.cpp:44:8: error: 'press' was not declared in this scope
   44 |     if(press(str+a[0]) == N){
      |        ^~~~~