Submission #1310709

#	Time	Username	Problem	Language	Result	Execution time	Memory
1310709		takoshanava	Data Transfer (IOI19_transfer)	C++20	100 / 100	34 ms	1736 KiB

transfer

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

vector<int> get_attachment(vector<int> source){
    int x = 0, sz = source.size();
    for(int i = 0; i < sz; i++){
        if(source[i]) x ^= (i + 1);
    }

    vector<int> vec;
    int par = 0;

    int B = (sz == 63 ? 6 : 8); 

    for(int i = 0; i < B; i++){
        int bit = (x >> i) & 1;
        vec.pb(bit);
        par ^= bit;
    }

    vec.pb(par);
    return vec;
}

vector<int> retrieve(vector<int> data){
    int N = data.size();

    int len, B;
    if(N == 63 + 7){
        len = 63;
        B = 6;
    } else {
        len = 255;
        B = 8;
    }

    vector<int> source(data.begin(), data.begin() + len);
    vector<int> extra(data.begin() + len, data.end() - 1);
    int par = data.back();

    int num = 0;
    for(int i = 0; i < len; i++){
        if(source[i]) num ^= (i + 1);
    }

    int num2 = 0, par2 = 0;
    for(int i = 0; i < B; i++){
        if(extra[i]){
            num2 |= (1 << i);
            par2 ^= 1;
        }
    }

    if(par != par2) return source;
    if(num == num2) return source;
    int idx = (num ^ num2) - 1;
    if(0 <= idx and idx < len){
        source[idx] ^= 1;
    }

    return source;
}

Compilation message (stderr)

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)
      |     ^~~~~~~~~~~~~~

• Subtask 1: 60 / 60
• Subtask 2: 40 / 40