如何从数组中移除一个元素，然后将其他元素移到上面

How to remove an element from an array and then shift other elements over?

本文关键字：元素 一个 然后 到上面 其他 数组      更新时间：2023-10-16

我的问题是最后一个函数print_valid_data。我应该从数组A[]中删除第二个最小值。删除该值后，数组中的元素需要转移，数组中最后一个空位为空。我在函数中所做的就是跳过它，打印出剩下的内容。我该如何通过删除然后转移来完成它？

附带说明：Var.h是一个只有数据"const int NUM=10"才能更改的文件，它用于数组的索引。"data.txt"文件中有一些整数（程序占>10个数字或<10个数字），这些整数是用Load_file_to_array函数读取的。

#include <iostream>
#include "Var.h"
#include <fstream>
#include <string>
using namespace std;
void Load_File_To_Array(int A[], string filename, int size);
int Get_2nd_Smallest(int A[], int size);
void Print_valid_data(int A[], int SecondMin, int size);
int main()
{
    int A[NUM];
    int size = NUM;
    int SecondMin = 0;
    string filename = "Data.txt";
    Load_File_To_Array(A, filename, size);
    Get_2nd_Smallest(A, size);
    Print_valid_data(A, SecondMin, size);
    cout << endl;
    system("Pause");
    return 0;
}
void Load_File_To_Array(int A[], string filename, int size)
{
    ifstream infile;
    infile.open(filename);
    cout << "The array is: ";
    for (int i = 0; i < NUM; i++)
    {
        if (infile.eof())
        break;
        infile >> A[i]; 
        cout << A[i] << ", ";
    }
    return;
}
int Get_2nd_Smallest(int A[], int size)
{
    int Min = A[0];
    int SecondMin = 0;
    for (int i = 0; i < NUM; i++)
    {
        if (Min > A[i])
            Min = A[i];
    }
    //Exchange-sort to sort the array in descending order
    int j, k;
    int counter;
    for (j = 0; j < (size - 1); j++)
    {
        for (k = (j + 1); k < size; k++)
        {
            if (A[j] < A[k])
            {
                counter = A[j];
                A[j] = A[k];
                A[k] = counter;
            }
        }
    }
    for (int n = (NUM - 1); n > -1; n--)
    {
        SecondMin = A[n];
        if (SecondMin >= 0)
        {
            SecondMin = A[n - 1];
            break;
        }
        else;
    }
    cout << endl << "The minimum number is: " << Min << endl;
    cout << "The second smallest integer is: " << SecondMin << endl;
    return SecondMin;
}
void Print_valid_data(int A[], int SecondMin, int size)
{
    cout << "The new array is: ";
    for (int i = 0; i < size; i++)
    {
        if (A[i] != SecondMin)
        {
            cout << A[i] << ", ";
        }
    }
    return;
}

以下可能会有所帮助，删除是通过复制上一个值来完成的：

const int size = 6;
int v[] = {5, 6, 8, 2, 3, 1};
std::partial_sort(std::begin(v), std::begin(v) + 2, std::end(v));
std::cout << "The minimum number is: " << v[0] << std::endl;
std::cout << "The second smallest integer is: " << v[1] << std::endl;
std::copy(std::begin(v) + 2, std::end(v), std::begin(v) + 1);
std::cout << "remaining values: ";
for (int i = 0; i != size - 1; ++i) {
    std::cout << v[i] << ", ";
}

实例

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