C++ 程序来计算数组中的反序
计数反序是指使数组有序所需的交换次数。反序计数 = 0,当数组有序时。反序计数 = 最大值,当数组按逆序排序时。
让我们开发一个 C++ 程序来计算数组中的反序。
算法
Begin Function CountInversionArray has arguments a[], n = number of elements. initialize counter c := 0 for i in range 0 to n-1, do for j in range (i + 1) to n, do if a[i] > a[j], then increase the count by 1 done done End.
示例代码
#include<iostream>
using namespace std;
int CountInversionArray(int a[], int n) {
int i, j, c = 0;
for(i = 0; i < n; i++) {
for(j = i+1; j < n; j++)
if(a[i] > a[j])
c++;
}
return c;
}
int main() {
int n, i;
cout<<"\nEnter the number of elements: ";
cin>>n;
int a[n];
for(i = 0; i < n; i++) {
cout<<"Enter element "<<i+1<<": ";
cin>>a[i];
}
cout<<"\nThe number of inversion in the array: "<<CountInversionArray(a, n);
return 0;
}输出
Enter the number of elements: 5 Enter element 1: 3 Enter element 2: 2 Enter element 3: 7 Enter element 4: 6 Enter element 5: 1 The number of inversion in the array: 6
广告
数据结构
网络
关系型数据库管理系统
操作系统
Java
iOS
HTML
CSS
Android
Python
C 编程
C++
C#
MongoDB
MySQL
Javascript
PHP