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c语言排序算法

news 2025/8/7 9:37:36

C语言代码示例：

冒泡排序（Bubble Sort）：

void bubbleSort(int arr[], int n) {for (int i = 0; i < n-1; i++) {for (int j = 0; j < n-i-1; j++) {if (arr[j] > arr[j+1]) {int temp = arr[j];arr[j] = arr[j+1];arr[j+1] = temp;}}}
}

插入排序（Insertion Sort）：

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

选择排序（Selection Sort）：

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

快速排序（Quick Sort）：

void quickSort(int arr[], int low, int high) {if (low < high) {int pi = partition(arr, low, high);quickSort(arr, low, pi - 1);quickSort(arr, pi + 1, high);}
}int partition(int arr[], int low, int high) {int pivot = arr[high];int i = (low - 1);for (int j = low; j <= high-1; j++) {if (arr[j] < pivot) {i++;int temp = arr[i];arr[i] = arr[j];arr[j] = temp;}}int temp = arr[i+1];arr[i+1] = arr[high];arr[high] = temp;return (i+1);
}

归并排序（Merge Sort）：

void merge(int arr[], int l, int m, int r) {int i, j, k;int n1 = m - l + 1;int n2 = r - m;int L[n1], R[n2];for (i = 0; i < n1; i++)L[i] = arr[l + i];for (j = 0; j < n2; j++)R[j] = arr[m + 1 + j];i = 0;j = 0;k = l;while (i < n1 && j < n2) {if (L[i] <= R[j]) {arr[k] = L[i];i++;} else {arr[k] = R[j];j++;}k++;}while (i < n1) {arr[k] = L[i];i++;k++;}while (j < n2) {arr[k] = R[j];j++;k++;}
}void mergeSort(int arr[], int l, int r) {if (l < r) {int m = l + (r - l) / 2;mergeSort(arr, l, m);mergeSort(arr, m + 1, r);merge(arr, l, m, r);}
}