Created
July 31, 2019 02:03
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1. 快速排序
2. 随机划分的快速排序
3. Go协程快速排序
4. 相同元素的快速排序
5. 尾递归的快速排序
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func partition(A []int, p, r int) int { | |
x, i := A[r-1], p | |
for j := p; j < r-1; j++ { | |
if A[j] <= x { | |
A[i], A[j] = A[j], A[i] | |
i++ | |
} | |
} | |
A[i], A[r-1] = A[r-1], A[i] | |
return i | |
} | |
// QuickSort O(nlgn) | |
func QuickSort(A []int, p, r int) { | |
if p+1 < r { | |
q := partition(A, p, r) | |
QuickSort(A, p, q) | |
QuickSort(A, q+1, r) | |
} | |
} |
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import "math/rand" | |
func partition(A []int, p, r int) int { | |
x, i := A[r-1], p | |
for j := p; j < r-1; j++ { | |
if A[j] <= x { | |
A[i], A[j] = A[j], A[i] | |
i++ | |
} | |
} | |
A[i], A[r-1] = A[r-1], A[i] | |
return i | |
} | |
func randPartition(A []int, p, r int) int { | |
i := rand.Intn(r-p) + p | |
A[i], A[r-1] = A[r-1], A[i] | |
return partition(A, p, r) | |
} | |
// RandQuickSort O(nlgn) | |
func RandQuickSort(A []int, p, r int) { | |
if p+1 < r { | |
q := randPartition(A, p, r) | |
RandQuickSort(A, p, q) | |
RandQuickSort(A, q+1, r) | |
} | |
} |
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import "math/rand" | |
func partition(A []int, p, r int) int { | |
x, i := A[r-1], p | |
for j := p; j < r-1; j++ { | |
if A[j] <= x { | |
A[i], A[j] = A[j], A[i] | |
i++ | |
} | |
} | |
A[i], A[r-1] = A[r-1], A[i] | |
return i | |
} | |
func randPartition(A []int, p, r int) int { | |
i := rand.Intn(r-p) + p | |
A[i], A[r-1] = A[r-1], A[i] | |
return partition(A, p, r) | |
} | |
// RandQuickSortGo O(nlgn) | |
func RandQuickSortGo(A []int, p, r int, chans chan<- int) { | |
if p+1 < r { | |
q := randPartition(A, p, r) | |
if r-p > 1000 { | |
c := make(chan int, 2) | |
go RandQuickSortGo(A, p, q, c) | |
go RandQuickSortGo(A, q+1, r, c) | |
for i := 0; i < 2; i++ { | |
<-c | |
} | |
} else { | |
RandQuickSortGo(A, p, q, nil) | |
RandQuickSortGo(A, q+1, r, nil) | |
} | |
} | |
if chans != nil { | |
chans <- 0 | |
} | |
} |
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import "math/rand" | |
func partitionSameElement(A []int, p, r int) (int, int) { | |
x, i, j := A[r-1], p, r | |
for k := p; k < j; k++ { | |
if A[k] <= x { | |
A[i], A[k] = A[k], A[i] | |
if A[i] != x { | |
i++ | |
} | |
} else if A[k] > x { | |
j-- | |
A[j], A[k] = A[k], A[j] | |
} | |
} | |
return i, j | |
} | |
func randPartitionSameElement(A []int, p, r int) (int, int) { | |
i := rand.Intn(r-p) + p | |
A[i], A[r-1] = A[r-1], A[i] | |
return partitionSameElement(A, p, r) | |
} | |
// TailRescursiveQuickSort O(nlgn) | |
func TailRescursiveQuickSort(A []int, p, r int) { | |
for p+1 < r { | |
q, t := randPartitionSameElement(A, p, r) | |
TailRescursiveQuickSort(A, p, q) | |
p = t | |
} | |
} |
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import "math/rand" | |
func partitionSameElement(A []int, p, r int) (int, int) { | |
x, i, j := A[r-1], p, r | |
for k := p; k < j; k++ { | |
if A[k] <= x { | |
A[i], A[k] = A[k], A[i] | |
if A[i] != x { | |
i++ | |
} | |
} else if A[k] > x { | |
j-- | |
A[j], A[k] = A[k], A[j] | |
} | |
} | |
return i, j | |
} | |
func randPartitionSameElement(A []int, p, r int) (int, int) { | |
i := rand.Intn(r-p) + p | |
A[i], A[r-1] = A[r-1], A[i] | |
return partitionSameElement(A, p, r) | |
} | |
// RandQuickSortSameElement O(nlgn) | |
func RandQuickSortSameElement(A []int, p, r int) { | |
if p+1 < r { | |
q, t := randPartitionSameElement(A, p, r) | |
RandQuickSortSameElement(A, p, q) | |
RandQuickSortSameElement(A, t, r) | |
} | |
} |
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