func isAnagram(s string, t string) bool {
c := [26]int{}
for i := 0; i < len(s); i++ {
c[s[i]-'a']++
}
for i := 0; i < len(t); i++ {
c[t[i]-'a']--
}
for i := 0; i < len(c); i++ {
if c[i] != 0 {
return false
}
}
return true
}