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#include<iostream>
#include <algorithm>
using namespace std;
 
int count=0,cache[50];
 
int f(int n)
{  
    if(n==2) count++;
    if(n==0 || n==1) return n;
    else if(cache[n]!=-1) return cache[n];
    else cache[n]= f(n-1)+f(n-2);
    return cache[n]; 
}
 
int main()
{
  std::cout << f(5);
 return 0;
}

prog.cpp: In function ‘int f(int)’:
prog.cpp:9: error: reference to ‘count’ is ambiguous
prog.cpp:5: error: candidates are: int count
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_algo.h:3987: error:                 template<class _IIter, class _Tp> typename std::iterator_traits::difference_type std::count(_IIter, _IIter, const _Tp&)
prog.cpp:9: error: reference to ‘count’ is ambiguous
prog.cpp:5: error: candidates are: int count
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_algo.h:3987: error:                 template<class _IIter, class _Tp> typename std::iterator_traits::difference_type std::count(_IIter, _IIter, const _Tp&)

Standard output is empty