Language: C++

#include <stdio.h>
#include <vector>
#include <map>
using namespace std;
int main( void )
{
	int N, Q ;
	scanf("%d %d\n", &N, &Q ) ;
	map<unsigned char,vector<int>> o;
	{
		char S[100000+1];
		scanf("%s", S ) ;
		for( int i = 0 ; S[i] ; i++ ) o[S[i]].emplace_back(i);
	}
	int m[100000];
	for( int n = 0 ; n < N ; n++ ) m[n] = 1 ;
	for( int q = 0 ; q < Q ; q++ ) {
		char t[2], d[2];
		scanf("%s %s", t, d ) ;
		auto & it = o.find(t[0]) ;
		if( it == o.end()) continue ;
		for( int i : it ) {
			int n = d[0]=='L' ? i-1 : i+1 ;
			if( n >= 0 && n < N ) {
				m[n]+=m[i] ;
			}
			m[i]=0;
		}
	}
	int c=0;
	for( int n = 0 ; n < N ; n++ ) c+=m[n];
	printf("%d\n", c ) ;
	return 0 ;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:20:35: error: cannot bind non-const lvalue reference of type 'std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >&' to an rvalue of type 'std::map<unsigned char, std::vector<int> >::iterator' {aka 'std::_Rb_tree<unsigned char, std::pair<const unsigned char, std::vector<int> >, std::_Select1st<std::pair<const unsigned char, std::vector<int> > >, std::less<unsigned char>, std::allocator<std::pair<const unsigned char, std::vector<int> > > >::iterator'}
   20 |                 auto & it = o.find(t[0]) ;
      |                             ~~~~~~^~~~~~
a.cc:22:30: error: no matching function for call to 'begin(std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >&)'
   22 |                 for( int i : it ) {
      |                              ^~
In file included from /usr/include/c++/14/bits/stl_vector.h:63,
                 from /usr/include/c++/14/vector:66,
                 from a.cc:2:
/usr/include/c++/14/initializer_list:88:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::begin(initializer_list<_Tp>)'
   88 |     begin(initializer_list<_Tp> __ils) noexcept
      |     ^~~~~
/usr/include/c++/14/initializer_list:88:5: note:   template argument deduction/substitution failed:
a.cc:22:30: note:   'std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >' is not derived from 'std::initializer_list<_Tp>'
   22 |                 for( int i : it ) {
      |                              ^~
In file included from /usr/include/c++/14/vector:69:
/usr/include/c++/14/bits/range_access.h:52:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&)'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:52:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&) [with _Container = std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >]':
a.cc:22:16:   required from here
   22 |                 for( int i : it ) {
      |                              ^~
/usr/include/c++/14/bits/range_access.h:52:50: error: 'struct std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >' has no member named 'begin'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |                                           ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&)'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&) [with _Container = std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >]':
a.cc:22:16:   required from here
   22 |                 for( int i : it ) {
      |                              ^~
/usr/include/c++/14/bits/range_access.h:63:56: error: 'const struct std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >' has no member named 'begin'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |                                                 ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::begin(_Tp (&)[_Nm])'
   95 |     begin(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note:   template argument deduction/substitution failed:
a.cc:22:30: note:   mismatched types '_Tp [_Nm]' and 'std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >'
   22 |                 for( int i : it ) {
      |                              ^~
/usr/include/c++/14/bits/range_access.h:113:31: note: candidate: 'template<class _Tp> _Tp* std::begin(valarray<_Tp>&)'
  113 |   template<typename _Tp> _Tp* begin(valarray<_Tp>&) noexcept;
      |                               ^~~~~
/usr/include/c++/14/bits/range_access.h:113:31: note:   template argument deduction/substitution failed:
a.cc:22:30: note:   'std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >' is not derived from 'std::valarray<_Tp>'
   22 |                 for( int i : it ) {
      |                              ^~
/usr/include/c++/14/bits/range_access.h:114:37: note: candidate: 'template<class _Tp> const _Tp* std::begin(const valarray<_Tp>&)'
  114 |   template<typename _Tp> const _Tp* begin(const valarray<_Tp>&) noexcept;
      |                                     ^~~~~
/usr/include/c++/14/bits/range_access.h:114:37: note:   template argument deduction/substitution failed:
a.cc:22:30: note:   'std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >' is not derived from 'const std::valarray<_Tp>'
   22 |                 for( int i : it ) {
      |                              ^~
a.cc:22:30: error: no matching function for call to 'end(std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >&)'
/usr/include/c++/14/initializer_list:99:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::end(initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
/usr/include/c++/14/initializer_list:99:5: note:   template argument deduction/substitution failed:
a.cc:22:30: note:   'std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >' is not derived from 'std::initializer_list<_Tp>'
   22 |                 for( int i : it ) {
      |                              ^~
/usr/include/c++/14/bits/range_access.h:74:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&)'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:74:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&) [with _Container = std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >]':
a.cc:22:16:   required from here
   22 |                 for( int i : it ) {
      |                              ^~
/usr/include/c++/14/bits/range_access.h:74:48: error: 'struct std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >' has no member named 'end'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |                                         ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:85:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&)'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:85:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&) [with _Container = std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >]':
a.cc:22:16:   required from here
   22 |                 for( int i : it ) {
      |                              ^~
/usr/include/c++/14/bits/range_access.h:85:54: error: 'const struct std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >' has no member named 'end'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |                                               ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:106:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::end(_Tp (&)[_Nm])'
  106 |     end(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~
/usr/include/c++/14/bits/range_access.h:106:5: note:   template argument deduction/substitution failed:
a.cc:22:30: note:   mismatched types '_Tp [_Nm]' and 'std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >'
   22 |                 for( int i : it ) {
      |                              ^~
/usr/include/c++/14/bits/range_access.h:115:31: note: candidate: 'template<class _Tp> _Tp* std::end(valarray<_Tp>&)'
  115 |   template<typename _Tp> _Tp* end(valarray<_Tp>&) noexcept;
      |                               ^~~
/usr/include/c++/14/bits/range_access.h:115:31: note:   template argument deduction/substitution failed:
a.cc:22:30: note:   'std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >' is not derived from 'std::valarray<_Tp>'
   22 |                 for( int i : it ) {
      |                              ^~
/usr/include/c++/14/bits/range_access.h:116:37: note: candidate: 'template<class _Tp> const _Tp* std::end(const valarray<_Tp>&)'
  116 |   template<typename _Tp> const _Tp* end(const valarray<_Tp>&) noexcept;
      |                                     ^~~
/usr/include/c++/14/bits/range_access.h:116:37: note:   template argument deduction/substitution failed:
a.cc:22:30: note:   'std::_Rb_tree_iterator<std::pair<const unsigned char, std::vector<int> > >' is not derived from 'const std::valarray<_Tp>'
   22 |                 for( int i : it ) {
      |                              ^~