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98 changes: 98 additions & 0 deletions c++ bin sort
Original file line number Diff line number Diff line change
@@ -0,0 +1,98 @@
#include <iostream>

using namespace std;

template <class T>
void Print(T& vec, int n, string s){
cout << s << ": [" << flush;
for (int i=0; i<n; i++){
cout << vec[i] << flush;
if (i < n-1){
cout << ", " << flush;
}
}
cout << "]" << endl;
}

int Max(int A[], int n){
int max = -32768;
for (int i=0; i<n; i++){
if (A[i] > max){
max = A[i];
}
}
return max;
}

// Linked List node
class Node{
public:
int value;
Node* next;
};

void Insert(Node** ptrBins, int idx){
Node* temp = new Node;
temp->value = idx;
temp->next = nullptr;

if (ptrBins[idx] == nullptr){ // ptrBins[idx] is head ptr
ptrBins[idx] = temp;
} else {
Node* p = ptrBins[idx];
while (p->next != nullptr){
p = p->next;
}
p->next = temp;
}
}

int Delete(Node** ptrBins, int idx){
Node* p = ptrBins[idx]; // ptrBins[idx] is head ptr
ptrBins[idx] = ptrBins[idx]->next;
int x = p->value;
delete p;
return x;
}

void BinSort(int A[], int n){
int max = Max(A, n);

// Create bins array
Node** bins = new Node* [max + 1];

// Initialize bins array with nullptr
for (int i=0; i<max+1; i++){
bins[i] = nullptr;
}

// Update count array values based on A values
for (int i=0; i<n; i++){
Insert(bins, A[i]);
}

// Update A with sorted elements
int i = 0;
int j = 0;
while (i < max+1){
while (bins[i] != nullptr){
A[j++] = Delete(bins, i);
}
i++;
}

// Delete heap memory
delete [] bins;
}

int main() {

int A[] = {2, 5, 8, 12, 3, 6, 7, 10};
int n = sizeof(A)/sizeof(A[0]);

Print(A, n, "\t\tA");
BinSort(A, n);
Print(A, n, " Sorted A");
cout << endl;
return 0;
}