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0067_add_binary.py
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72 lines (69 loc) · 2.32 KB
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class Solution:
def addBinary(self, a: str, b: str) -> str:
if (a == '0' or a == ''):
return b
if (b == '0' or b == ''):
return a
add = ''
carry = '0'
for i in range(1, max(len(a), len(b)) + 1):
if (i > len(b)):
if (carry == '1'):
# 1 + 1
if (a[-i] == '1'):
add = '0' + add
# 0 + 1
else:
add = '1' + add
carry = '0'
else:
# 1 + 0
if (a[-i] == '1'):
add = '1' + add
# 0 + 0
else:
add = '0' + add
carry = '0'
elif (i > len(a)):
if (carry == '1'):
# 1 + 1
if (b[-i] == '1'):
add = '0' + add
# 0 + 1
else:
add = '1' + add
carry = '0'
else:
# 1 + 0
if (b[-i] == '1'):
add = '1' + add
# 0 + 0
else:
add = '0' + add
carry = '0'
else:
# 1 + 1 + 1
if (a[-i] == '1' and b[-i] == '1' and carry == '1'):
add = '1' + add
elif (carry == '0'):
# 1 + 1 + 0
if (a[-i] == '1' and b[-i] == '1'):
add = '0' + add
carry = '1'
# 0 + 0 + 0
elif (a[-i] == '0' and b[-i] == '0'):
add = '0' + add
# 1 + 0 + 0 or 0 + 1 + 0
else:
add = '1' + add
else:
# 0 + 0 + 1
if (a[-i] == '0' and b[-i] == '0'):
add = '1' + add
carry = '0'
# 1 + 0 + 1 or 0 + 1 + 1
else:
add = '0' + add
if (carry == '1'):
return carry + add
return add