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世界上有10种人:认识二进制的和不认识二进制的

排序算法

joe posted @ 2010年4月24日 06:46 in 编程 with tags 排序算法 , 1593 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;
    }
    }
    }
    
    
    

 

  • 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--;
    }
    }
    }
    
    
  • 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);
}

 

 

  • 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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