C++数组元素删除与指针操作

#include <iostream>
using namespace std;
<p>void removeElement(int*& arr, int& size, int index) {
if (index < 0 || index >= size) {
cout << "无效索引\n";
return;
}</p><pre class="brush:php;toolbar:false;"><pre class="brush:php;toolbar:false;">// 前移元素
for (int i = index; i < size - 1; ++i) {
    arr[i] = arr[i + 1];
}

// 缩小数组（可选：重新分配内存）
size--;
int* temp = new int[size];
for (int i = 0; i < size; ++i) {
    temp[i] = arr[i];
}
delete[] arr;
arr = temp;

cout << "原数组: ";
for (int i = 0; i < size; ++i) {
    cout << arr[i] << " ";
}
cout << endl;

removeElement(arr, size, 2);  // 删除索引2的元素（30）

cout << "删除后: ";
for (int i = 0; i < size; ++i) {
    cout << arr[i] << " ";
}
cout << endl;

delete[] arr;
return 0;

void removeValue(int*& arr, int& size, int value) {
    int writeIndex = 0;
    int* temp = new int[size];
<pre class="brush:php;toolbar:false;"><pre class="brush:php;toolbar:false;">// 使用指针遍历
for (int* p = arr; p < arr + size; ++p) {
    if (*p != value) {
        temp[writeIndex++] = *p;
    }
}

delete[] arr;
size = writeIndex;
arr = new int[size];
for (int i = 0; i < size; ++i) {
    arr[i] = temp[i];
}
delete[] temp;

#include <vector>
#include <algorithm>
<p>std::vector<int> vec = {10, 20, 30, 40, 50};
vec.erase(std::remove(vec.begin(), vec.end(), 30), vec.end());