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fix:修复好后缀的前缀被跳过的情况 #536

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fix:修复好后缀的前缀被跳过的情况 #536

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0f25949
fix:修复好后缀的前缀被跳过的情况
Anwenya Nov 30, 2023
c54ead0
perf:减少一次匹配
Anwenya Nov 30, 2023
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15 changes: 7 additions & 8 deletions go/32_string/string_bm.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@ import (
"math"
)

//bc: pattern char index hash mapping
// bc: pattern char index hash mapping
func generateBC(pattern string) []int {

bc := make([]int, 256)
Expand All @@ -21,7 +21,7 @@ func generateBC(pattern string) []int {
return bc
}

//generate suffix and prefix array for pattern
// generate suffix and prefix array for pattern
func generateGS(pattern string) ([]int, []bool) {
m := len(pattern)
suffix := make([]int, m)
Expand Down Expand Up @@ -50,7 +50,7 @@ func generateGS(pattern string) ([]int, []bool) {
return suffix, prefix
}

//todo
// todo
func moveByGS(patternLength int, badCharStartIndex int, suffix []int, prefix []bool) int {

//length of good suffix
Expand All @@ -61,13 +61,12 @@ func moveByGS(patternLength int, badCharStartIndex int, suffix []int, prefix []b
return badCharStartIndex + 1 - suffix[k]
}

//partial match
for t := patternLength - 1; t > badCharStartIndex+1; t-- {
if prefix[t] {
return t
//search prefix
for k--; k > 0; k-- {
if prefix[k] {
return patternLength - k
}
}

//no match
return patternLength

Expand Down