请帮我吧C++基础算法用代码的形式写出来并且整理
时间: 2024-02-21 07:58:50 浏览: 16
好的,以下是常见的C++基础算法的代码实现:
1. 冒泡排序
```c++
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]) {
swap(arr[j], arr[j + 1]);
}
}
}
}
```
2. 快速排序
```c++
void quickSort(int arr[], int left, int right) {
if (left >= right) {
return;
}
int i = left, j = right, pivot = arr[left];
while (i < j) {
while (i < j && arr[j] >= pivot) {
--j;
}
arr[i] = arr[j];
while (i < j && arr[i] <= pivot) {
++i;
}
arr[j] = arr[i];
}
arr[i] = pivot;
quickSort(arr, left, i - 1);
quickSort(arr, i + 1, right);
}
```
3. 插入排序
```c++
void insertionSort(int arr[], int n) {
for (int i = 1; i < n; ++i) {
int key = arr[i];
int j = i - 1;
while (j >= 0 && arr[j] > key) {
arr[j + 1] = arr[j];
--j;
}
arr[j + 1] = key;
}
}
```
4. 选择排序
```c++
void selectionSort(int arr[], int n) {
for (int i = 0; i < n - 1; ++i) {
int minIndex = i;
for (int j = i + 1; j < n; ++j) {
if (arr[j] < arr[minIndex]) {
minIndex = j;
}
}
swap(arr[i], arr[minIndex]);
}
}
```
5. 希尔排序
```c++
void shellSort(int arr[], int n) {
for (int gap = n / 2; gap > 0; gap /= 2) {
for (int i = gap; i < n; ++i) {
int j = i;
int temp = arr[i];
while (j - gap >= 0 && arr[j - gap] > temp) {
arr[j] = arr[j - gap];
j -= gap;
}
arr[j] = temp;
}
}
}
```
6. 归并排序
```c++
void merge(int arr[], int left, int mid, int right) {
int n1 = mid - left + 1;
int n2 = right - mid;
int L[n1], R[n2];
for (int i = 0; i < n1; ++i) {
L[i] = arr[left + i];
}
for (int i = 0; i < n2; ++i) {
R[i] = arr[mid + i + 1];
}
int i = 0, j = 0, k = left;
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 left, int right) {
if (left < right) {
int mid = left + (right - left) / 2;
mergeSort(arr, left, mid);
mergeSort(arr, mid + 1, right);
merge(arr, left, mid, right);
}
}
```
7. 堆排序
```c++
void heapify(int arr[], int n, int i) {
int largest = i;
int left = 2 * i + 1;
int right = 2 * i + 2;
if (left < n && arr[left] > arr[largest]) {
largest = left;
}
if (right < n && arr[right] > arr[largest]) {
largest = right;
}
if (largest != i) {
swap(arr[i], arr[largest]);
heapify(arr, n, largest);
}
}
void heapSort(int arr[], int n) {
for (int i = n / 2 - 1; i >= 0; --i) {
heapify(arr, n, i);
}
for (int i = n - 1; i >= 0; --i) {
swap(arr[0], arr[i]);
heapify(arr, i, 0);
}
}
```
以上是常见的C++基础算法的代码实现,可以根据具体的需求选择合适的算法。