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Finished first exercise #1

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0ede92c
Finished first exercise
Nov 15, 2018
39d47c8
Performance improvement for frequency list insert
Nov 15, 2018
21c0b04
Finished 2nd exercise
Nov 15, 2018
abc5e82
Fixed findings from comments in pull request
lkrizan Nov 19, 2018
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76 changes: 76 additions & 0 deletions exercise/01/containers.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,76 @@
#include "containers.h"
#include <set>
#include <cwctype>

std::wstring to_lower(std::wstring const& str)
{
// std::transform unfortunatly not allowed
std::wstring res;
res.reserve(str.size());
for (const wchar_t c : str)
{
res.push_back(std::iswupper(c) ? std::towlower(c) : c);
}
return res;
}

void remove_element(std::vector<int>& v, const int index)
{
v.erase(v.begin() + index);
}

void input_element(std::vector<std::wstring>& v, const int index, const std::wstring& value)
{
v.insert(v.begin() + index, value);
}

int list_nth_element(const std::list<int>& c, const int index)
{
auto it = c.cbegin();
std::advance(it, index);
return *it;
}

void list_sort_desc(std::list<int>& c)
{
// std::sort not allowed
std::set<int> tmp_c;
for (auto&& elem : c)
tmp_c.insert(elem);
c.clear();
for(auto it = tmp_c.crbegin(); it != tmp_c.crend(); ++it)
c.push_back(*it);
}

int unique_numbers(std::wistream& stream)
{
int elem;
std::set<int> tmp_s;
while (stream >> elem)
{
tmp_s.insert(elem);
}
return tmp_s.size();
}

word_frequency::word_frequency(std::wistream& stream)
{
std::wstring elem;
while (stream >> elem)
{
elem = to_lower(elem);
freq[elem]++;
}
}

int word_frequency::frequency(const std::wstring& s) const
{
const std::wstring lowercase_s = to_lower(s);
const auto it = freq.find(lowercase_s);
return (it != freq.end()) ? it->second : 0;
}

int word_frequency::count() const noexcept
{
return freq.size();
}
10 changes: 7 additions & 3 deletions exercise/01/containers.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2,19 +2,23 @@
#include <string>
#include <vector>
#include <list>
#include <map>

void remove_element(std::vector<int>& v, int index);
void input_element(std::vector<std::wstring>& v, int index, const std::wstring& value);

int list_nth_element(const std::list<int>& c, int index);
void list_sort_desc(std::list<int>& c);

int unique_numbers(std::wistream&);
int unique_numbers(std::wistream& stream);

class word_frequency
{
public:
word_frequency(std::wistream&);
int frequency(const std::wstring& s);
int count();
int frequency(const std::wstring& s) const;
int count() const noexcept;

private:
std::map<std::wstring, int> freq;
};
192 changes: 96 additions & 96 deletions exercise/01/e01.vcxproj
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Original file line number Diff line number Diff line change
@@ -1,97 +1,97 @@
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