cout << "未构建成堆时的数据" << endl; for (auto& tmp:nums) { cout << tmp << " "; } cout << endl; for报错了
时间: 2024-06-13 12:08:55 浏览: 20
这段代码中的for循环使用了范围for循环,其中auto& tmp表示对nums中的每个元素进行引用,因此在循环过程中可以修改nums中的元素。但是,如果在循环过程中修改了nums的大小,就会导致迭代器失效,从而报错。因此,如果在循环过程中需要修改nums的大小,应该使用传统的for循环。
以下是修改后的代码:
```c++
cout << "未构建成堆时的数据" << endl;
for (int i = 0; i < nums.size(); i++) {
cout << nums[i] << " ";
}
cout << endl;
```
相关问题
优化这段代码 int n; cout <<"输入数组长度:" << endl; cin >> n; cout <<"请输入数组:" << endl; int nums[n]; for(int i=0;i<n;i++) { cin >> nums[n]; } shunxuSort(nums); for (int num : nums) { cout <<"顺序排序的结果"<< num << " "; } cout << endl; zhebanSort(nums); for (int num : nums) { cout <<"折半排序的结果:"<< num << " "; } cout << endl; maopaoSort(nums); for (int num : nums) { cout <<"冒泡排序的结果:"<< num << " "; } cout << endl; return 0; }
int n;
cout << "输入数组长度:" << endl;
cin >> n;
int *nums = new int[n];
cout << "请输入数组:" << endl;
for (int i = 0; i < n; i++) {
cin >> nums[i];
}
shunxuSort(nums);
cout << "顺序排序的结果:";
for (int i = 0; i < n; i++) {
cout << nums[i] << " ";
}
cout << endl;
zhebanSort(nums);
cout << "折半排序的结果:";
for (int i = 0; i < n; i++) {
cout << nums[i] << " ";
}
cout << endl;
maopaoSort(nums);
cout << "冒泡排序的结果:";
for (int i = 0; i < n; i++) {
cout << nums[i] << " ";
}
cout << endl;
delete[] nums;
return 0;
```
在这个优化中,我们使用了动态分配内存来为数组分配空间,同时使用循环遍历数组元素而不是使用范围 for 循环,这样可以避免在每次迭代中计算数组大小。
另外,在每次输出结果后,我们添加了一个换行符,使输出更加清晰。最后,我们使用 delete[] 释放了数组所占用的内存,避免内存泄漏。
vector<int>& nums)什么意思
A vector is a dynamic array in C++ that allows us to store and manipulate a collection of elements of the same data type. The vector<int> is a specific type of vector that stores integers (int). Here is an example of how we can declare and initialize a vector<int>:
```
#include <vector>
#include <iostream>
using namespace std;
int main() {
// declare and initialize a vector of integers
vector<int> myVector = {1, 2, 3, 4, 5};
// print the vector elements
for (int i = 0; i < myVector.size(); i++) {
cout << myVector[i] << " ";
}
cout << endl;
return 0;
}
```
Output:
```
1 2 3 4 5
```
In this example, we declare a vector of integers called `myVector` and initialize it with five integer values. We then use a for loop to iterate through the elements of the vector and print them to the console. The output shows the values 1, 2, 3, 4, and 5, separated by spaces.
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