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combination.cpp
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71 lines (63 loc) · 2.24 KB
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#include "combination.h"
void GenerateCombinationHelper(const std::vector<int>& seq, const int k, std::vector<std::vector<int>>& result, std::vector<int>& current, const int start)
{
if (static_cast<int>(current.size()) == k)
{
result.push_back(current);
return;
}
for (int i = start; i < static_cast<int>(seq.size()); ++i)
{
current.push_back(seq[i]);
GenerateCombinationHelper(seq, k, result, current, i + 1);
current.pop_back();
}
}
auto Combination::GenerateCombination(const std::vector<int>& seq, const int k) -> std::vector<std::vector<int>>
{
std::vector<std::vector<int>> result;
std::vector<int> combination;
GenerateCombinationHelper(seq, k, result, combination, 0);
return result;
}
void GenerateCombinationHelper(const std::vector<std::string>& seq, const int k, std::vector<std::vector<std::string>>& result, std::vector<std::string>& current, const int start)
{
if (static_cast<int>(current.size()) == k)
{
result.push_back(current);
return;
}
for (int i = start; i < static_cast<int>(seq.size()); ++i)
{
current.push_back(seq[i]);
GenerateCombinationHelper(seq, k, result, current, i + 1);
current.pop_back();
}
}
auto Combination::GenerateCombination(const std::vector<std::string>& seq, const int k) -> std::vector<std::vector<std::string>>
{
std::vector<std::vector<std::string>> result;
std::vector<std::string> combination;
GenerateCombinationHelper(seq, k, result, combination, 0);
return result;
}
void GenerateCombinationHelper(const std::string& str, const int k, std::vector<std::string>& result, const std::string& current, const int start)
{
if (k == 0)
{
result.push_back(current);
return;
}
for (int i = start; i <= static_cast<int>(str.length()) - k; ++i)
{
std::string new_current = current + str[i];
GenerateCombinationHelper(str, k - 1, result, new_current, i + 1);
}
}
auto Combination::GenerateCombination(const std::string& str, const int k) -> std::vector<std::string>
{
std::vector<std::string> result;
const std::string combination;
GenerateCombinationHelper(str, k, result, combination, 0);
return result;
}