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package qsort
type uint192 = struct {
hi uint64
mid uint64
lo uint64
}
type smallsort192 func(data []uint192, base int, swap func(int, int))
type partition192 func(data []uint192, base int, swap func(int, int)) int
func quicksort192(data []uint192, base, cutoff int, smallsort smallsort192, partition partition192, swap func(int, int)) {
for len(data) > 1 {
if len(data) <= cutoff/24 {
smallsort(data, base, swap)
return
}
medianOfThree192(data, base, swap)
p := partition(data, base, swap)
if p < len(data)-p { // recurse on the smaller side
quicksort192(data[:p], base, cutoff, smallsort, partition, swap)
data = data[p+1:]
base = base + p + 1
} else {
quicksort192(data[p+1:], base+p+1, cutoff, smallsort, partition, swap)
data = data[:p]
}
}
}
func insertionsort192(data []uint192, base int, swap func(int, int)) {
for i := 1; i < len(data); i++ {
item := data[i]
for j := i; j > 0 && less192(item, data[j-1]); j-- {
data[j], data[j-1] = data[j-1], data[j]
callswap(base, swap, j, j-1)
}
}
}
func medianOfThree192(data []uint192, base int, swap func(int, int)) {
end := len(data) - 1
mid := len(data) / 2
if less192(data[0], data[mid]) {
data[mid], data[0] = data[0], data[mid]
callswap(base, swap, mid, 0)
}
if less192(data[end], data[0]) {
data[0], data[end] = data[end], data[0]
callswap(base, swap, 0, end)
if less192(data[0], data[mid]) {
data[mid], data[0] = data[0], data[mid]
callswap(base, swap, mid, 0)
}
}
}
func hoarePartition192(data []uint192, base int, swap func(int, int)) int {
i, j := 1, len(data)-1
if len(data) > 0 {
pivot := data[0]
for j < len(data) {
for i < len(data) && less192(data[i], pivot) {
i++
}
for j > 0 && less192(pivot, data[j]) {
j--
}
if i >= j {
break
}
data[i], data[j] = data[j], data[i]
callswap(base, swap, i, j)
i++
j--
}
data[0], data[j] = data[j], data[0]
callswap(base, swap, 0, j)
}
return j
}
func less192(a, b uint192) bool {
return a.hi < b.hi ||
(a.hi == b.hi && a.mid < b.mid) ||
(a.hi == b.hi && a.mid == b.mid && a.lo < b.lo)
}
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