package q137

func singleNumber(nums []int) int {
	bitCounts := make([]uint8, 32)
	for _, num := range nums {
		num32 := int32(num)
		for i := range 32 {
			if num32|1<<i == num32 {
				bitCounts[i] = (bitCounts[i] + 1) % 3
			}
		}
	}
	var ret int32
	for i := range 32 {
		if bitCounts[i] != 0 {
			ret |= 1 << i
		}
	}
	return int(ret)
}

var _ = singleNumber