add by jinshaohui for bucket sort

c-cpp/13_sorts/sort.c

@@ -158,11 +158,111 @@ void radix_sort_test()
 	return;
 }
 
+struct barrel {   
+    int node[10];   
+    int count;/* the num of node */  
+};   
+int partition(int a[],int left,int right)
+{
+   int i = left;
+   int j = right;
+   int key = a[left];
+
+   while(i < j)
+   {
+	   while((i < j)&& (a[j] >= key))
+	   {
+		   j--;
+	   }
+	   if (i < j)
+	   {
+		   a[i] = a[j];
+	   }
+	   while((i < j) && a[i] <= key)
+	   {
+		   i++;
+	   }
+
+	   if (i<j)
+	   {
+		   a[j] = a[i];
+	   }
+   }
+   a[i] = key;
+
+   return i;
+}
+
+void quick_sort(int a[],int left,int right)
+{
+	int q = 0;
+	/*递归终止条件*/
+	if (left >= right)
+	{
+		return;
+	}
+
+	q = partition(a,left,right);
+	quick_sort(a,left,(q - 1));
+	quick_sort(a,(q + 1),right);
+	return;
+}
+  
+void bucket_sort(int data[], int size)   
+{   
+    int max, min, num, pos;   
+    int i, j, k;   
+    struct barrel *pBarrel;   
+  
+    max = min = data[0];   
+    for (i = 1; i < size; i++) {   
+        if (data[i] > max) {   
+            max = data[i];   
+        } else if (data[i] < min) {   
+            min = data[i];   
+        }   
+    }   
+    num = (max - min + 1) / 10 + 1;   
+    pBarrel = (struct barrel*)malloc(sizeof(struct barrel) * num);   
+    memset(pBarrel, 0, sizeof(struct barrel) * num);   
+  
+    /* put data[i] into barrel which it belong to */  
+    for (i = 0; i < size; i++) {   
+        k = (data[i] - min + 1) / 10;/* calculate the index of data[i] in barrel */  
+        (pBarrel + k)->node[(pBarrel + k)->count] = data[i];   
+        (pBarrel + k)->count++;   
+    }   
+       
+    pos = 0;   
+    for (i = 0; i < num; i++) {
+		if ((pBarrel + i)->count != 0)
+		{
+            quick_sort((pBarrel+i)->node, 0, ((pBarrel+i)->count)-1);/* sort node in every barrel */  
+  
+            for (j = 0; j < (pBarrel+i)->count; j++) {   
+                data[pos++] = (pBarrel+i)->node[j];   
+            }
+		}
+    }   
+    free(pBarrel);   
+}
+
+void bucket_sort_test()
+{
+	int a[] = {78, 17, 39, 26, 72, 94, 21, 12, 23, 91};   
+    int size = sizeof(a) / sizeof(int);   
+	printf("\r\n bucket sort test ...");
+    bucket_sort(a, size); 
+	dump(a,size);
+	
+}
 
 int main()
 {
     count_sort_test();
 
 	radix_sort_test();
+
+	bucket_sort_test();
 	return 0;
 }