题目:982. 按位与为零的三元组 - 力扣(LeetCode) func countTriplets(nums []int) int { mp := map[int]int{} for _,i := range nums{ for _,j := range nums{ mp[i&j]++ } } res := 0 for _,k := range nums{ set := k ^ 0xffff for sub := set; sub > 0; sub = (sub-1)&set{ res += mp[sub] } res += mp[0] } return res }