■

動かない理由は後で考える。

class MinDifference {
public:
  int closestElements(int A0, int X, int Y, int M, int n) {
	int res=10000;
	
	vector<int> a(1,A0);
	for(;a.size()<n;a.push_back(((a.back()*X)+Y)%M));
	sort(a.begin(), a.end());
	vector<int> buf;
	adjacent_difference(a.begin(), a.end(), buf);
	return buf[min_element(buf.begin() + 1, buf.end())];;	
  }
};

エラーメッセージは下記。

MinDifference.cpp: In member function `int MinDifference::closestElements(int, i
nt, int, int, int)':
MinDifference.cpp:113: error: no match for 'operator[]' in 'buf[std::min_element
 [with _ForwardIterator = __gnu_cxx::__normal_iterator<int*, std::vector<int, st
d::allocator<int> > >]((&buf)->std::vector<_Tp, _Alloc>::begin [with _Tp = int,
_Alloc = std::allocator<int>](), (&buf)->std::vector<_Tp, _Alloc>::end [with _Tp
 = int, _Alloc = std::allocator<int>]())]'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_vector.h:462: note: candi
dates are: typename _Alloc::reference std::vector<_Tp, _Alloc>::operator[](size_
t) [with _Tp = int, _Alloc = std::allocator<int>]
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_vector.h:476: note:  type
name _Alloc::const_reference std::vector<_Tp, _Alloc>::operator[](size_t) const
[with _Tp = int, _Alloc = std::allocator<int>]
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_numeric.h: In function `_
OutputIterator std::adjacent_difference(_InputIterator, _InputIterator, _OutputI
terator) [with _InputIterator = __gnu_cxx::__normal_iterator<int*, std::vector<i
nt, std::allocator<int> > >, _OutputIterator = std::vector<int, std::allocator<i
nt> >]':
MinDifference.cpp:112:   instantiated from here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_numeric.h:279: error: no
match for 'operator*' in '*__result'
MinDifference.cpp:112:   instantiated from here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_numeric.h:283: error: no
match for 'operator++' in '++__result'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_numeric.h:286: error: no
match for 'operator++' in '++__result'