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#include <iostream>
#include <vector>
#include <algorithm> // std::shuffle
#include <array> // std::array
#include <random> // std::default_random_engine
#include <chrono> // std::chrono::system_clock
std::vector<int> mysteryAlgorithmOne(const std::vector<int>& elements) {
std::vector<int> sorted;
for (const auto& element : elements) {
for (int i = 0; i < sorted.size() + 1; i++) {
if (i == sorted.size() || sorted[i] > element) {
sorted.push_back(0);
int j = sorted.size() - 1;
while (j > i) {
sorted[j] = sorted[j - 1];
j--;
}
sorted[i] = element;
break;
}
}
}
return sorted;
}
void mysteryAlgorithmTwo(std::vector<int>& elements) {
for (int i = 0; i < elements.size(); i++) {
const int current = elements[i];
int j = i - 1;
while (j >= 0 and elements[j] > current) {
elements[j+1] = elements[j];
j--;
}
elements[j+1] = current;
}
return;
}
// Given a vector of integers, prints each element out.
// Example: Given {1,2,3}
// Will print: [1, 2, 3] to std::cout.
void printVector(const std::vector<int>& elements) {
std::cout << "[";
for (int i = 0; i < elements.size(); i++) {
const int element = elements[i];
std::cout << " " << element;
if (i < elements.size() - 1) {
std::cout << ",";
}
}
std::cout << "]" << std::endl;
return;
}
bool isSorted(const std::vector<int>& input) {
for (int i = 0; i < input.size() - 1; i++) {
// Check that the array is equal or increasing at each step.
if (input[i] > input[i+1]) {
return false;
}
}
return true;
}
void tryIt() {
std::vector<int> input = {1,2,3,4,5,6,7,8};
for (int i = 0; i < 100; i++) {
// obtain a time-based seed and shuffle.
unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
std::shuffle(input.begin(), input.end(), std::default_random_engine(seed));
// sort it.
mysteryAlgorithmTwo(input);
if (isSorted(input)) {
std::cout << "YES IT IS SORTED" << std::endl;
}
}
}
int main()
{
std::vector<int> elements = {5, 4, 3 ,2, 1};
std::cout << "We're sorting with mysteryAlgorithmOne:" << std::endl;
printVector(elements);
const std::vector<int> firstSort = mysteryAlgorithmOne(elements);
printVector(firstSort);
std::cout << std::endl << "We're sorting with mysteryAlgorithmTwo" << std::endl;
printVector(elements);
mysteryAlgorithmTwo(elements);
printVector(elements);
tryIt();
return 0;
}
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