Submission #685821

#	Time	Username	Problem	Language	Result	Execution time	Memory
685821		grossly_overconfident	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int N) {
    string f;
    vector<char> letter;
    if (press("AB") != 0) {
        if (press("A") == 1) {
            f = "A";
            letter = { 'B', 'X', 'Y' };
        }
        else {
            f = "B";
            letter = { 'A', 'X', 'Y' };
        }
    }
    else {
        if (press("X") == 1) {
            f = "X";
            letter = { 'B', 'A', 'Y' };
        }
        else {
            f = "Y";
            letter = { 'B', 'X', 'A' };
        }
    }
    int l = 1;
    string result = f;
    while (l < N) {
        string testcase;
        testcase = result + letter[0] + letter[1] + result + letter[1] + letter[0];
        int outcome = press(testcase);
        if (outcome == l) {
            result += letter[2];
            l += 1;
        }
        else if (outcome == l + 2) {
            testcase = result;
            testcase += letter[0] + letter[1];
            if (press(testcase) == l) {
                result += letter[1] + letter[0];
            }
            else {
                result += letter[0] + letter[1];
            }
            l += 2;
        }
        else {
            testcase = result;
            testcase += letter[0] + letter[2];
            if (press(testcase) == l) {
                result += letter[1] + letter[2];
            }
            else {
                result += letter[0] + letter[2];
            }
            l += 2;
        }
    }
    if (l == N) {
        return result;
    }
    if (press(letter[0]) > l) {
        result += letter[0];
        return result;
    }
    if (press(letter[1]) > l) {
        result += letter[1];
        return result;
    }
    result += letter[2];
    return result;



}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:63:24: error: could not convert 'letter.std::vector<char>::operator[](0)' from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'std::string' {aka 'std::__cxx11::basic_string<char>'}
   63 |     if (press(letter[0]) > l) {
      |                        ^
      |                        |
      |                        __gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}
combo.cpp:67:24: error: could not convert 'letter.std::vector<char>::operator[](1)' from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'std::string' {aka 'std::__cxx11::basic_string<char>'}
   67 |     if (press(letter[1]) > l) {
      |                        ^
      |                        |
      |                        __gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}