Submission #1228858

#	Time	Username	Problem	Language	Result	Execution time	Memory
1228858		olnyfcxwps	Machine (IOI24_machine)	C++20	Compilation error	0 ms	0 KiB

machine

#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
#include <map>
using namespace std;

vector<int> answer(const vector<int> &q, int x) {
    vector<int> a;
    for (auto &t : q)
        t = t ^ x;
    sort(a.begin(), a.end());
    return a;
}

vector<int> find_permutation(int n) {
    vector<int> q;
    for (int t = 0; t <= n + 2; t++) {
        if (t == 1 || t == 2 || t == 5)
            continue;
        q.push_back(t);
    }
    vector<int> a = use_machine(q);
    vector<int> a_sorted = a;
    sort(a_sorted.begin(), a_sorted.end());
    int x = 0;
    for (; x <= 255; x++) {
        vector<int> b_sorted = answer(q, x);
        if (a_sorted == b_sorted) {
            break;
        }
    }
    for (auto &t : a) {
        a = a ^ x;
    }
    vector<int> final_answer(n);
    for (int i = 0; i < n; i++) {
        int j = q[i];
        // find where j is in a
        int k = 0;
        for (; k < n && a[k] != j; k++) ;
        final_answer[k] = i;
    }
    return final_answer;
}

Compilation message (stderr)

machine.cpp: In function 'std::vector<int> answer(const std::vector<int>&, int)':
machine.cpp:11:11: error: assignment of read-only reference 't'
   11 |         t = t ^ x;
      |         ~~^~~~~~~
machine.cpp: In function 'std::vector<int> find_permutation(int)':
machine.cpp:23:21: error: 'use_machine' was not declared in this scope
   23 |     vector<int> a = use_machine(q);
      |                     ^~~~~~~~~~~
machine.cpp:34:15: error: no match for 'operator^' (operand types are 'std::vector<int>' and 'int')
   34 |         a = a ^ x;
      |             ~ ^ ~
      |             |   |
      |             |   int
      |             std::vector<int>
In file included from /usr/include/c++/11/ios:42,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from machine.cpp:1:
/usr/include/c++/11/bits/ios_base.h:91:3: note: candidate: 'constexpr std::_Ios_Fmtflags std::operator^(std::_Ios_Fmtflags, std::_Ios_Fmtflags)'
   91 |   operator^(_Ios_Fmtflags __a, _Ios_Fmtflags __b)
      |   ^~~~~~~~
/usr/include/c++/11/bits/ios_base.h:91:27: note:   no known conversion for argument 1 from 'std::vector<int>' to 'std::_Ios_Fmtflags'
   91 |   operator^(_Ios_Fmtflags __a, _Ios_Fmtflags __b)
      |             ~~~~~~~~~~~~~~^~~
/usr/include/c++/11/bits/ios_base.h:133:3: note: candidate: 'constexpr std::_Ios_Openmode std::operator^(std::_Ios_Openmode, std::_Ios_Openmode)'
  133 |   operator^(_Ios_Openmode __a, _Ios_Openmode __b)
      |   ^~~~~~~~
/usr/include/c++/11/bits/ios_base.h:133:27: note:   no known conversion for argument 1 from 'std::vector<int>' to 'std::_Ios_Openmode'
  133 |   operator^(_Ios_Openmode __a, _Ios_Openmode __b)
      |             ~~~~~~~~~~~~~~^~~
/usr/include/c++/11/bits/ios_base.h:173:3: note: candidate: 'constexpr std::_Ios_Iostate std::operator^(std::_Ios_Iostate, std::_Ios_Iostate)'
  173 |   operator^(_Ios_Iostate __a, _Ios_Iostate __b)
      |   ^~~~~~~~
/usr/include/c++/11/bits/ios_base.h:173:26: note:   no known conversion for argument 1 from 'std::vector<int>' to 'std::_Ios_Iostate'
  173 |   operator^(_Ios_Iostate __a, _Ios_Iostate __b)
      |             ~~~~~~~~~~~~~^~~