Naive mode function in C++
123456789101112131415161718192021222324252627282930313233
#include <iostream>
#include <vector>
#include <unordered_map>
#include <algorithm>
template<typename T>
T mode(const std::vector<T>& numbers) {
std::unordered_map<T, size_t> frequency;
for (auto num : numbers) {
if (!frequency[num]) {
frequency[num] = 0;
}
frequency[num]++;
}
using pair_type = typename decltype(frequency)::value_type;
return std::max_element(
frequency.begin(),
frequency.end(),
[](const pair_type& a, const pair_type& b) {
return a.second < b.second;
}
)->first;
}
int main() {
auto numbers = std::vector<int>{5, 3, 7, 3};
std::cout << "mode numbers result: " << mode(numbers) << std::endl;
auto strings = std::vector<std::string>{"Hello", "World", "You", "Suck", "World"};
std::cout << "mode strings result: " << mode(strings) << std::endl;
return 0;
}
Cpp
INFO