https://leetcode-cn.com/problems/valid-anagram/
异或运算找重复值
func f(s string) int {
n := len(s)
var a int
a = 1
for i := 0; i < n; i++ {
a ^= int(rune(s[i]))
}
return a
}
func isAnagram(s string, t string) bool {
return f(s)^f(t) == 0
}
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