Submission #1310835

#	Time	Username	Problem	Language	Result	Execution time	Memory
1310835		nikoloz-ch	Data Transfer (IOI19_transfer)	C++20	Compilation error	0 ms	0 KiB

transfer

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

vector<int> get_attachment(vector<int> source){
    int p = 0, k = 0; const int n = source.size(), kp = (n == 63 ? 6 : 8);
    for(int i = 0; i < n; i++) if(source[i]) p ^= source[i];
    auto t = bitset<kp>(p); 
    for(int i = 0; i < t.size(); i++) source.push_back(t[i]), k += (t[i] ? 1 : 0);
    source.push_back(k % 2);
}

vector<int> retrieve(vector<int> data){
    int p = 0, k = 0, kp = 0; const int n = data.size();
    for(int i = 0; i < n-(n >= 255 ? 9 : 7); i++) if(data[i]) p ^= data[i];
    for(int i = n; i < n+(n >= 255 ? 8 : 6); i++){
        if(data[i]) k += (1<<(i-n));
        kp += (data[i] ? 1 : 0);
    }
    vector<int> ans;
    if(data.back() != kp % 2){
        for(int i = 0; i < n-(n >= 255 ? 9 : 7); i++) ans.push_back(data[i]);
        return ans;
    }
    for(int i = 0; i < n-(n >= 255 ? 9 : 7); i++){
        if(i == (p^k)) ans.push_back((data[i] ? 0 : 1));
        else ans.push_back(data[i]);
    }
    return ans;
}

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> get_attachment(std::vector<int>)':
transfer.cpp:8:23: error: the value of 'kp' is not usable in a constant expression
    8 |     auto t = bitset<kp>(p);
      |                       ^
transfer.cpp:6:52: note: 'kp' was not initialized with a constant expression
    6 |     int p = 0, k = 0; const int n = source.size(), kp = (n == 63 ? 6 : 8);
      |                                                    ^~
transfer.cpp:8:23: note: in template argument for type 'long unsigned int'
    8 |     auto t = bitset<kp>(p);
      |                       ^
transfer.cpp:11:1: warning: no return statement in function returning non-void [-Wreturn-type]
   11 | }
      | ^
grader.cpp: In instantiation of 'void shuffle(std::vector<T>&) [with T = Scenario]':
grader.cpp:200:10:   required from here
grader.cpp:28:23: warning: 'void std::random_shuffle(_RAIter, _RAIter) [with _RAIter = __gnu_cxx::__normal_iterator<Scenario*, vector<Scenario> >]' is deprecated: use 'std::shuffle' instead [-Wdeprecated-declarations]
   28 |         random_shuffle(v.begin(), v.end());
      |         ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/13/algorithm:61,
                 from grader.cpp:8:
/usr/include/c++/13/bits/stl_algo.h:4581:5: note: declared here
 4581 |     random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last)
      |     ^~~~~~~~~~~~~~