Submission #1174329

#	Time	Username	Problem	Language	Result	Execution time	Memory
1174329		3lektra	Coins (IOI17_coins)	C++20	Compilation error	0 ms	0 KiB

coins

#include<bits/stdc++.h>
#include "coins.h"

std::vector<int> coin_flips(std::vector<int> b, int c) {
    int y = 0;
    for(int i = 0; i < 64; ++i){
        y = y^(i*b[i]);
    }
    int a = y^c;

    if(b[a])b[a] = 0;
    else b[a] = 1;

    vector<int> d;
    d.push_back(a);

    return d;
}

int find_coin(std::vector<int> b) {
    int c;
    for(int i = 0; i < 64; ++i){
        c = c^(i*b[i]);
    }

    return c;
}

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:14:5: error: 'vector' was not declared in this scope
   14 |     vector<int> d;
      |     ^~~~~~
coins.cpp:14:5: note: suggested alternatives:
In file included from /usr/include/c++/11/vector:67,
                 from /usr/include/c++/11/functional:62,
                 from /usr/include/c++/11/pstl/glue_algorithm_defs.h:13,
                 from /usr/include/c++/11/algorithm:74,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:65,
                 from coins.cpp:1:
/usr/include/c++/11/bits/stl_vector.h:389:11: note:   'std::vector'
  389 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
In file included from /usr/include/c++/11/functional:62,
                 from /usr/include/c++/11/pstl/glue_algorithm_defs.h:13,
                 from /usr/include/c++/11/algorithm:74,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:65,
                 from coins.cpp:1:
/usr/include/c++/11/vector:86:13: note:   'std::pmr::vector'
   86 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
coins.cpp:14:12: error: expected primary-expression before 'int'
   14 |     vector<int> d;
      |            ^~~
coins.cpp:15:5: error: 'd' was not declared in this scope
   15 |     d.push_back(a);
      |     ^