Submission #574315

#	Time	Username	Problem	Language	Result	Execution time	Memory
574315		keta_tsimakuridze	Crayfish scrivener (IOI12_scrivener)	C++17	Compilation error	0 ms	0 KiB

scrivener

#include<bits/stdc++.h>
using namespace std;
const int N = 1000005;
int id, c[N][25], prev[N];
vector<char> s;
void Init() {
	s.push_back('0');
}
void TypeLetter(char L) {
	id++;
	c[id][0] = id;
	s.push_back(L);
	prev[id] = c[id - 1][0];
	for(int i = 1;  i < 20; i++) {
		if(id < (1 << i)) break;
		c[id][i] = c[prev[c[id][i - 1]]][i - 1];
	}
}
void UndoCommands(int U) {
	++id; s.push_back('0');
	int x = id - U - 1;
	for(int i = 0; i < 20; i++) c[id][i] = c[x][i]; 
}
char GetLetter(int P) {
	int x = c[id][0];
	for(int i = 20 - 1; i >= 0; i--) {
		if((1 << i) < P) x = prev[c[id][i]], P -= 1 << i; 
	}
	return s[c[id][0]];
}

Compilation message (stderr)

scrivener.cpp: In function 'void TypeLetter(char)':
scrivener.cpp:13:2: error: reference to 'prev' is ambiguous
   13 |  prev[id] = c[id - 1][0];
      |  ^~~~
In file included from /usr/include/c++/10/bits/stl_algobase.h:66,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from scrivener.cpp:1:
/usr/include/c++/10/bits/stl_iterator_base_funcs.h:224:5: note: candidates are: 'template<class _BidirectionalIterator> constexpr _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)'
  224 |     prev(_BidirectionalIterator __x, typename
      |     ^~~~
scrivener.cpp:4:19: note:                 'int prev [1000005]'
    4 | int id, c[N][25], prev[N];
      |                   ^~~~
scrivener.cpp:16:16: error: reference to 'prev' is ambiguous
   16 |   c[id][i] = c[prev[c[id][i - 1]]][i - 1];
      |                ^~~~
In file included from /usr/include/c++/10/bits/stl_algobase.h:66,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from scrivener.cpp:1:
/usr/include/c++/10/bits/stl_iterator_base_funcs.h:224:5: note: candidates are: 'template<class _BidirectionalIterator> constexpr _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)'
  224 |     prev(_BidirectionalIterator __x, typename
      |     ^~~~
scrivener.cpp:4:19: note:                 'int prev [1000005]'
    4 | int id, c[N][25], prev[N];
      |                   ^~~~
scrivener.cpp: In function 'char GetLetter(int)':
scrivener.cpp:27:24: error: reference to 'prev' is ambiguous
   27 |   if((1 << i) < P) x = prev[c[id][i]], P -= 1 << i;
      |                        ^~~~
In file included from /usr/include/c++/10/bits/stl_algobase.h:66,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from scrivener.cpp:1:
/usr/include/c++/10/bits/stl_iterator_base_funcs.h:224:5: note: candidates are: 'template<class _BidirectionalIterator> constexpr _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)'
  224 |     prev(_BidirectionalIterator __x, typename
      |     ^~~~
scrivener.cpp:4:19: note:                 'int prev [1000005]'
    4 | int id, c[N][25], prev[N];
      |                   ^~~~