我试图实现冒泡排序方法为Ruby的一个简单的编码问题,但我遇到了一些麻烦。 我理解的想法是看的第一个元素的值,并把它比作第二个元素的值,然后相应地交换他们,但我似乎无法做到这一点在实际的问题。 会有人愿意提供这如何可能在Ruby中工作的一个简单的例子?
Answer 1:
正确执行冒泡排序的while循环
def bubble_sort(list)
return list if list.size <= 1 # already sorted
swapped = true
while swapped do
swapped = false
0.upto(list.size-2) do |i|
if list[i] > list[i+1]
list[i], list[i+1] = list[i+1], list[i] # swap values
swapped = true
end
end
end
list
end
Answer 2:
arr = [4,2,5,1]
loop until arr.each_cons(2).with_index.none?{|(x,y),i| arr[i],arr[i+1] = y,x if x > y}
p arr #=> [1, 2, 4, 5]
Answer 3:
资源
def bubble_sort(list)
return list if list.size <= 1 # already sorted
loop do
swapped = false
0.upto(list.size-2) do |i|
if list[i] > list[i+1]
list[i], list[i+1] = list[i+1], list[i] # swap values
swapped = true
end
end
break unless swapped
end
list
end
虽然我一定会推荐一些具有更好的运行时间比冒泡:)
Answer 4:
这里是我顶答案的版本。 它调用数组大小只有一次,而不是每一个循环。 一旦他们转移到阵列结束它不比较的元素。
并从while循环退出一个循环越快。 大功告成,一旦你通过整个阵列消失了,只有做一个交换,因此无需与0互换另做。
def bubble_sort(list)
iterations = list.size - 2
return list unless iterations > 0 # already sorted
swaps = 2
while swaps > 1 do
swaps = 0
0.upto(iterations) do |i|
if list[i] > list[i + 1]
list[i], list[i + 1] = list[i + 1], list[i] # swap values
swaps += 1
end
end
iterations -= 1
end
list
end
运行这个测试需要减少25%的时间。
that_array = this_array = [22,66,4,44,5,7,392,22,8,77,33,118,99,6,1,62,29,14,139,2]
49.times {|variable| that_array = that_array + this_array}
bubble_sort that_array
Answer 5:
只是重新写@ VanDarg的代码使用while循环(注:代码没有测试......在你自己的危险跑)
def bubble_sort(list)
return list if list.size <= 1 # already sorted
swapped = true
while swapped
swapped = false # maybe this time, we won't find a swap
0.upto(list.size-2) do |i|
if list[i] > list[i+1]
list[i], list[i+1] = list[i+1], list[i] # swap values
swapped = true # found a swap... keep going
end
end
end
list
end
编辑:因为冒泡排序排序保持,同时还有掉期正在取得更新换值-只要它发现没有更多的互换,将停止排序。 请注意,这并不关注@ Doug的代码,但它与@ cLuv的修正符合
Answer 6:
def bubble_sort array
array.each do
swap_count = 0
array.each_with_index do |a, index|
break if index == (array.length - 1)
if a > array[index+1]
array[index],array[index+1] = array[index +1], array[index]
swap_count += 1
end
end
break if swap_count == 0 # this means it's ordered
end
array
end
Answer 7:
该直截了当:
def bubble_sort(n)
return n if n.length <= 1
0.upto(n.length - 1) do |t|
0.upto(n.length - 2 - t) do |i|
if n[i] > n[i + 1]
n[i], n[i + 1] = n[i + 1], n[i]
end
end
end
n
end
Answer 8:
如果你不想使用这个有趣的交换线(IMO):
arr[i], arr[j] = arr[j], arr[i]
这里是我的看法:
def bubble_sort(arr)
temp = 0
arr.each do |i|
i = 0
j = 1
while (j < arr.length)
if arr[i] > arr[j]
temp = arr[i]
arr[i] = arr[j]
arr[j] = temp
p arr
end
i+=1
j+=1
end
end
arr
end
Answer 9:
老套
def bubble_sort(random_numbers)
for i in 0..random_numbers.size
for j in i+1..random_numbers.size-1
random_numbers[i], random_numbers[j] = random_numbers[j], random_numbers[i] if(random_numbers[i] > random_numbers[j])
end
end
random_numbers
end
Answer 10:
class Array a = [6, 5, 4, 3, 2, 1] n = a.length for j in 0..n-1 for i in 0..n - 2 - j if a[i]>a[i+1] tmp = a[i] a[i] = a[i+1] a[i+1] = tmp end end end puts a.inspect end
Answer 11:
下面是使用运营商XOR我的见解:
def bubble(arr)
n = arr.size - 1
k = 1
loop do
swapped = false
0.upto(n-k) do |i|
if arr[i] > arr[i+1]
xor = arr[i]^arr[i+1]
arr[i] = xor^arr[i]
arr[i+1] = xor^arr[i+1]
swapped = true
end
end
break unless swapped
k +=1
end
return arr
end
Answer 12:
另外,稍有不同的命名。
def bubble_sort(list)
return list if list.size <= 1
not_sorted = true
while not_sorted
not_sorted = false
0.upto(list.size - 2) do |i|
if list[i] > list[i + 1]
list[i], list[i + 1] = list[i + 1], list[i]
not_sorted = true
end
end
end
list
end
Answer 13:
def bubbleSort(list)
sorted = false
until sorted
sorted = true
for i in 0..(list.length - 2)
if list[i] > list[i + 1]
sorted = false
list[i], list[i + 1] = list[i + 1], list[i]
end
end
end
return list
end
Answer 14:
这里是我的代码。 我喜欢用(arr.length-1)。 对于循环,您还可以使用这样的重复,如直到,而对于,高达,循环做,等有趣的尝试不同的事情,看看它是如何发挥作用。
def bubble_sort(arr) #10/17/13 took me 8mins to write it
return arr if arr.length <= 1
sorted = true
while sorted
sorted = false
(arr.length-1).times do |i|
if arr[i] > arr[i+1]
arr[i], arr[i+1] = arr[i+1], arr[i]
sorted = true
end
end
end
arr
end
文章来源: Using the Bubble sort method for an array in Ruby [closed]