Submission #933341

#	Time	Username	Problem	Language	Result	Execution time	Memory
933341		SulA	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

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

string guess_sequence(int n) {
    string s;
    vector<char> a(4) = {'A','B','X','Y'};
    int x = press("AB");
    if (x == 2) s += "AB";
    else if (x == 1) {
        s = (press("A") == 1 ? "A" : "B");
    }
    else {
        s = (press("X") == 1 ? "X" : "Y");
    }
    if (n == 1) return s;

    int first = find(a.begin(), a.end(), s[0]);
    erase(first, a.begin(), a.end());
    for (int i = s.size(); i < n-1; i++) {
        x = press(s + a[0] + s + a[1] + a[0] + s + a[1] + a[1] + s + a[1] + a[2]);
        if (x == s.size()) s += a[2];
        else if (x == s.size() + 1) s += a[1];
        else s += a[2];
    }

    x = press(s + a[0]);
    if (x > s.size()) return s + a[0];
    else if (press(s + a[1]) > s.size()) return s + a[1];
    return s + a[2];

}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:7:23: error: expected ',' or ';' before '=' token
    7 |     vector<char> a(4) = {'A','B','X','Y'};
      |                       ^
combo.cpp:18:21: error: cannot convert '__gnu_cxx::__normal_iterator<char*, std::vector<char> >' to 'int' in initialization
   18 |     int first = find(a.begin(), a.end(), s[0]);
      |                 ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                     |
      |                     __gnu_cxx::__normal_iterator<char*, std::vector<char> >
combo.cpp:19:5: error: 'erase' was not declared in this scope
   19 |     erase(first, a.begin(), a.end());
      |     ^~~~~
combo.cpp:22:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         if (x == s.size()) s += a[2];
      |             ~~^~~~~~~~~~~
combo.cpp:23:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         else if (x == s.size() + 1) s += a[1];
      |                  ~~^~~~~~~~~~~~~~~
combo.cpp:28:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     if (x > s.size()) return s + a[0];
      |         ~~^~~~~~~~~~
combo.cpp:29:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     else if (press(s + a[1]) > s.size()) return s + a[1];
      |              ~~~~~~~~~~~~~~~~^~~~~~~~~~