Merge pull request wangzheng0822#73 from RichardWeiYang/master

Sorts in c

c-cpp/11_sorts/sorts.c

@@ -0,0 +1,139 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+struct array {
+	int size;
+	int used;
+	int *arr;
+};
+
+void dump(struct array *array)
+{
+	int idx;
+
+	for (idx = 0; idx < array->used; idx++)
+		printf("[%02d]: %08d\n", idx, array->arr[idx]);
+}
+
+void alloc(struct array *array)
+{
+	array->arr = (int *)malloc(array->size * sizeof(int));
+}
+
+void bubble_sort(struct array *array)
+{
+	int i, j;
+
+	if (array->used <= 1)
+		return;
+
+	for (i = 0; i < array->used; i++) {
+		bool has_swap = false;
+		for (j = 0; j < array->used - i - 1; j++) {
+			if (array->arr[j] > array->arr[j+1]) {
+				int tmp;
+				tmp = array->arr[j];
+				array->arr[j] = array->arr[j+1];
+				array->arr[j+1] = tmp;
+				has_swap = true;
+			}
+
+		}
+		if (!has_swap)
+			break;
+	}
+}
+
+void bubble_sort_test()
+{
+	int idx;
+	struct array ten_int = {10, 0, NULL};
+
+	alloc(&ten_int);
+	for (idx = 0; idx < 10; idx++)
+		ten_int.arr[idx] = 30 - idx;
+	ten_int.used = 10;
+	dump(&ten_int);
+	bubble_sort(&ten_int);
+	dump(&ten_int);
+}
+
+void insertion_sort(struct array *array)
+{
+	int i, j;
+
+	if (array->used <= 1)
+		return;
+
+	for (i = 1; i < array->used; i++) {
+		int val = array->arr[i];
+
+		for (j = i - 1; j >= 0; j--) {
+			if (val < array->arr[j])
+				array->arr[j+1] = array->arr[j]; 
+			else
+				break;
+		}
+		array->arr[j+1] = val;
+	}
+}
+
+void insertion_sort_test()
+{
+	int idx;
+	struct array ten_int = {10, 0, NULL};
+
+	alloc(&ten_int);
+	for (idx = 0; idx < 10; idx++)
+		ten_int.arr[idx] = 30 - idx;
+	ten_int.used = 10;
+	dump(&ten_int);
+	insertion_sort(&ten_int);
+	dump(&ten_int);
+}
+
+void selection_sort(struct array *array)
+{
+	int i, j;
+
+	if (array->used <= 1)
+		return;
+
+	for (i = 0; i < array->used - 1; i++) {
+		int tmp, idx = i;
+
+		for (j = i + 1; j < array->used; j++)
+			if (array->arr[j] < array->arr[idx])
+				idx = j;
+
+		if (idx == i)
+			continue;
+
+		tmp = array->arr[i];
+		array->arr[i] = array->arr[idx];
+		array->arr[idx] = tmp;
+	}
+}
+
+void selection_sort_test()
+{
+	int idx;
+	struct array ten_int = {10, 0, NULL};
+
+	alloc(&ten_int);
+	for (idx = 0; idx < 10; idx++)
+		ten_int.arr[idx] = 30 - idx;
+	ten_int.used = 10;
+	dump(&ten_int);
+	selection_sort(&ten_int);
+	dump(&ten_int);
+}
+
+int main()
+{
+	//bubble_sort_test();
+	//selection_sort_test();
+	insertion_sort_test();
+	return 0;
+}

java/11_sorts/Sorts.java

@@ -58,6 +58,9 @@ public static void selectionSort(int[] a, int n) {
         }
       }
 
+      if (minIndex == i)
+        continue;
+
       // 交换
       int tmp = a[i];
       a[i] = a[minIndex];