func contain_duplicate(s string) bool {
for _, c := range s {
var count int
for _, cc := range s {
if c == cc {
count++
}
}
if count > 1 {
return true
}
}
return false
}
func lengthOfLongestSubstring(s string) int {
var ll int
for i:=0; i<len(s); i++ {
for e:=i; e<len(s)+1; e++ {
ss := s[i:e]
if !contain_duplicate(ss) {
l := len(ss)
if l > ll {
ll = l
}
}
if ll == 95 {
return ll
}
}
}
return ll
}