/
simpleindex.go
62 lines (49 loc) · 940 Bytes
/
simpleindex.go
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package types
type SimpleIndex struct {
Index []int64
}
func (array *SimpleIndex) SearchLowerBound(key int64) int {
var low int = 0
var high int = len(array.Index) - 1
var mid = (low + high) / 2
if array.Index[low] > key {
return -1
}
for low <= high {
if array.Index[mid] == key {
break
}
if array.Index[mid] > key {
high = mid - 1
} else {
low = mid + 1
}
mid = (low + high) / 2
}
return mid
}
func (array *SimpleIndex) SearchUpperBound(key int64) int {
var low int = 0
var high int = len(array.Index) - 1
var mid = (low + high) / 2
if array.Index[high] <= key {
return -1
}
for low <= high {
if array.Index[mid] > key {
if mid-1 >= low && key >= array.Index[mid-1] {
return mid
} else {
high = mid - 1
}
} else {
if mid+1 <= high && key < array.Index[mid+1] {
return mid + 1
} else {
low = mid + 1
}
}
mid = (low + high) / 2
}
return mid
}