Radix Sort in C++

sorting-algorithms/radix_sort.cpp

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+#include <iostream>
+#include <cstdlib>
+#include <ctime>
+#include <queue>
+
+using namespace std;
+
+/*
+ * RadixSort:
+ * Radix Sort is to do digit by digit sort starting 
+ * from least significant digit to most significant digit
+ *
+ * Best Case Time Complexity: Ω(nk)
+ * Average/Worst Case Time Complexity: O(nk)
+ */
+
+#define BUCKET 10 
+#define DIGIT 4
+
+void radix_sort(int arr[], int n) {
+	int i, j,k=0;
+	queue<int> q[10];
+	int radix = 1;
+	for (int d = 0; d < DIGIT; d++) {
+		// sort arr according to the digit using queue
+		for (i = 0; i < n; i++)						
+			q[(arr[i] / radix) % 10].push(arr[i]);
+		// build the output arr
+		for (i=j=0; j < BUCKET; j++)			
+			while (!q[j].empty()){
+				arr[i++] = q[j].front();
+				q[j].pop();
+			}
+		radix *= 10;
+	}
+}
+
+int main() {
+	srand(time(NULL));
+	int array[10]={};
+	//push randomly created number below 10000 into the array
+	for (int i = 0; i < 10; i++) {
+		array[i] = rand() % 10000;
+		cout << array[i] << " ";
+	}
+	cout << endl;
+	radix_sort(array, 10);
+	for (int i = 0; i < 10; i++) {
+		cout << array[i] << " ";
+	}
+}
+
+
+
+