#include <iostream>
#include <cstdlib>
using std:: cin;
using std:: cout;
using std:: endl;
const int N=10;
void readarray(int array[], int N);
int bubble_sort (int array[], int size, int round,
int place);
int main ()
{
int array[N];
readarray( array, N );
int round, place;
cout << bubble_sort(array, N, place, round);
return EXIT_SUCCESS;
}
void readarray(int array[], int N)
{
int i=0;
if (i < N)
{
cin >> array[i];
readarray(array+1, N-1);
}
}
int bubble_sort (int array[], int size, int round,
int place)
{
round =0;
place =0;
if (round < N-1) // this goes over the array again making sure it has
// sorted from lowest to highest
{
if (place < N - round -1) // this sorts the array only 2 cells at a
// time
if (array[0] > array[1])
{
int temp = array[1];
array[1]=array[0];
array[0]=temp;
return (array+1, size-1, place+1, round);
}
return (array+1, size-1, place, round+1);
}
}
我知道如何使用两个for循环进行冒泡排序,我想使用递归来完成它。使用循环你需要两个for循环,我想要递归它可能还需要两个递归函数/调用。这就是我到目前为止所拥有的。问题是它只输出一个数字,即1或0.我不确定我的回报是否正确。
答案 0 :(得分:1)
在c ++ 11中,你可以这样做:
#include <iostream>
#include <vector>
void swap(std::vector<int &numbers, size_t i, size_t j)
{
int t = numbers[i];
numbers[i] = numbers[j];
numbers[j] = t;
}
bool bubble_once(std::vector<int> &numbers, size_t at)
{
if (at >= numbers.size() - 1)
return false;
bool bubbled = numbers[at] > numbers[at+1];
if (bubbled)
swap(numbers, at, at+1);
return bubbled or bubble_once(numbers, at + 1);
}
void bubble_sort(std::vector<int> &numbers)
{
if ( bubble_once(numbers, 0) )
bubble_sort(numbers);
}
int main() {
std::vector<int> numbers = {1,4,3,6,2,3,7,8,3};
bubble_sort(numbers);
for (size_t i=0; i != numbers.size(); ++i)
std::cout << numbers[i] << ' ';
}
通常,您可以使用递归函数替换每个循环:
但是,为了防止(n实际)堆栈溢出,避免循环同样足够的递归是一种很好的做法。此外,循环具有非常规范的形式,因此对于许多程序员来说易于阅读,而递归可以在许多程序中完成,因此更难以阅读,测试和验证。哦,递归通常较慢,因为它需要创建一个新的堆栈框架(需要引用,不太确定)。
修改强>
使用普通数组:
#include <iostream>
#include <vector>
#define N 10
void swap(int *numbers, size_t i, size_t j)
{
int t = numbers[i];
numbers[i] = numbers[j];
numbers[j] = t;
}
bool bubble_once(int *numbers, size_t at)
{
if (at >= N - 1)
return false;
bool bubbled = numbers[at] > numbers[at+1];
if (bubbled)
swap(numbers, at, at+1);
return bubbled or bubble_once(numbers, at + 1);
}
void bubble_sort(int *numbers)
{
if ( bubble_once(numbers, 0) )
bubble_sort(numbers);
}
int main() {
int numbers[N] = {1,4,3,6,2,3,7,8,3,5};
bubble_sort(numbers);
for (size_t i=0; i != N; ++i)
std::cout << numbers[i] << ' ';
}
答案 1 :(得分:1)
请阅读this post
function pass(i,j,n,arr)
{
if(arr[i]>arr(j))
swap(arr[i],arr[j]);
if(j==n)
{
j=0;
i=i+1;
}
if(i==n+1)
return arr;
return pass(i,j+1,n,arr);
}