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binary.py
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binary.py
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# Sum of Two Integers
def getSum(a: int, b: int) -> int:
mask = 0xffffffff
while b & mask:
a, b = a ^ b, (a & b) << 1
return a & mask if b > mask else a | b
# Number of 1 Bits
def hammingWeight(n: int) -> int:
count = 0
while n:
count += n & 1
n >>= 1
return count
# Counting Bits
def countBits(n: int) -> List[int]:
res = [0] * (n + 1)
for i in range(1, n + 1):
res[i] = res[i & (i - 1)] + 1
return res
# Missing Number
def missingNumber(nums: List[int]) -> int:
expected_sum = len(nums) * (len(nums) + 1) // 2
actual_sum = sum(nums)
return expected_sum - actual_sum
# Reverse Bits
def reverseBits(n: int) -> int:
res = 0
for i in range(32):
res <<= 1
res |= (n & 1)
n >>= 1
return res