From 59cbe4938a057d8022ac874767eba221e3b2ba41 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Edvard=20Th=C3=B6rnros?= <edvard.thornros@gmail.com>
Date: Sat, 6 Apr 2019 23:22:46 +0200
Subject: [PATCH] C++ sorting implementation.

---
 bucksort.cpp | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 bucksort.cpp

diff --git a/bucksort.cpp b/bucksort.cpp
new file mode 100644
index 0000000..bbe9198
--- /dev/null
+++ b/bucksort.cpp
@@ -0,0 +1,113 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define BUCKETS 0b1000
+#define BUCKET_SIZE 20
+#define LENGTH 32
+
+int count = 0;
+bool LT(int a, int b)
+{
+	count++;
+	return a < b;
+}
+
+void sort(short *data, int length)
+{
+	short buckets[BUCKETS][BUCKET_SIZE] = {};
+	short a_, pc, c, d;
+
+	// Bucketsort
+	for (a_ = 0; a_ < length; a_++)
+	{
+		c = data[a_];
+		d = (c >> 13) & 0b111;
+		pc = buckets[d][0];
+		pc++;
+		buckets[d][0] = pc;
+		buckets[d][pc] = c;
+	}
+
+	for (short q = 0; q < BUCKETS; q++)
+	{
+		short *curr = buckets[q];
+		int length = curr[0];
+		printf("buck: %d\tlength: %hd\n", q, curr[0]);
+		for (short i = 0; i < length; i++)
+		{
+			printf("%hd, ", curr[i + 1]);
+		}
+		printf("\n");
+	}
+#if 0
+i ← 1
+while i < length(A)
+	x ← A[i]
+	j ← i - 1
+	while j >= 0 and A[j] > x
+		A[j+1] ← A[j]
+		j ← j - 1
+	end while
+	A[j+1] ← x
+	i ← i + 1
+end while
+#endif
+	
+	// Insertion Sort
+	for (short q = 0; q < BUCKETS; q++)
+	{
+		short length = buckets[q][0];
+		short *curr = buckets[q] + 1;
+		a_ = 1;
+		while (a_ < length)
+		{
+			c = curr[a_];
+			pc = a_ - 1;
+			while (pc >= 0 && LT(curr[pc], c))
+			{
+				curr[pc+1] = curr[pc];
+				pc--;
+			}
+			curr[pc+1] = c;
+			a_++;
+		}
+	}
+
+	// Merge the buckets
+	pc = 0;
+	int h = 0b100;
+	for (short q = 0; q < BUCKETS; q++)
+	{
+		short *curr = buckets[h];
+		h = (h + 1) & 0b111;
+		a_ = curr[0];
+		while (a_ >= 1)
+		{
+			data[pc] = curr[a_];
+			pc++;
+			a_--;
+		}
+	}
+}
+
+int main(int *argc, char **argv)
+{
+	short data[LENGTH] = {};
+
+	srand(clock());
+	for (int i = 0; i < LENGTH; i++)
+	{
+		data[i] = rand() % 0xFFFF;
+	}
+
+	sort(data, LENGTH);
+
+	printf("Num compares: %d\n", count);
+	for (int i = 0; i < LENGTH; i++)
+	{
+		printf("%hd, ", data[i] & 0xFFFF);
+	}
+	printf("\n");
+	return 0;
+}