排序算法

joe posted @ 2010年4月24日 06:46 in 编程 with tags 排序算法 , 1716 阅读

选择排序：

void selectionSort(int arr[], int n){
int i, j, minIndex, tmp;
for (i = 0; i < n - 1; i++){
minIndex = i;
for (j = i + 1; j < n; j++)
if (arr[j] < arr[minIndex])
minIndex = j;
if (minIndex != i){
tmp = arr[i];
arr[i] = arr[minIndex];
arr[minIndex] = tmp;
}
}
}

void selectionSort(int arr[], int n){
int i, j, minIndex, tmp;
for (i = 0; i < n - 1; i++){
minIndex = i;
for (j = i + 1; j < n; j++)
if (arr[j] < arr[minIndex])
minIndex = j;
if (minIndex != i){
tmp = arr[i];
arr[i] = arr[minIndex];
arr[minIndex] = tmp;
}
}
}

插入排序：

void insertionSort(int arr[], int length){
int i, j, tmp;
for (i = 1; i < length; i++){
j = i;
while (j > 0 &amp;amp;&amp;amp; arr[j - 1] > arr[j]){
tmp = arr[j];
arr[j] = arr[j - 1];
arr[j - 1] = tmp;
j--;
}
}
}

void insertionSort(int arr[], int length){
int i, j, tmp;
for (i = 1; i < length; i++){
j = i;
while (j > 0 &amp;amp;&amp;amp; arr[j - 1] > arr[j]){
tmp = arr[j];
arr[j] = arr[j - 1];
arr[j - 1] = tmp;
j--;
}
}
}

冒泡排序：

void bubbleSort(int arr[], int n){
bool swapped = true;
int j = 0;
int tmp;
while (swapped){
swapped = false;
j++;
for (int i = 0; i < n - j; i++){
if (arr[i] > arr[i + 1]){
tmp = arr[i];
arr[i] = arr[i + 1];
arr[i + 1] = tmp;
swapped = true;
}
}
}
}

快速排序：

void quickSort(int arr[], int left, int right){
int i = left, j = right;
int tmp;
int pivot = arr[(left + right) / 2];

/* partition */
while (i < = j){
while (arr[i] < pivot)
i++;
while (arr[j] > pivot)
j--;
if (i < = j){
tmp = arr[i];
arr[i] = arr[j];
arr[j] = tmp;
i++;
j--;
}
}

/* recursion */
if (left < j)
quickSort(arr, left, j);
if (i < right)
quickSort(arr, i, right);
}

void quickSort(int arr[], int left, int right){
int i = left, j = right;
int tmp;
int pivot = arr[(left + right) / 2];

/* partition */
while (i < = j){
while (arr[i] < pivot)
i++;
while (arr[j] > pivot)
j--;
if (i < = j){
tmp = arr[i];
arr[i] = arr[j];
arr[j] = tmp;
i++;
j--;
}
}

/* recursion */
if (left < j)
quickSort(arr, left, j);
if (i < right)
quickSort(arr, i, right);
}

排序算法稳定性比较：
稳定的排序法：插入排序，冒泡排序，归并排序，基数排序。
不稳定的排序法：选择排序，希尔排序，快速排序，堆排序。

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