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First solution in Uncategorized category for Adjacent Letters by arun_maiti
def adjacent_letters(line: str) -> str:
res = ""
for char in line:
if not res or char != res[-1]:
res += char
else:
res = res[:-1]
return res
print("Example:")
print(adjacent_letters("abbaca"))
# These "asserts" are used for self-checking
assert adjacent_letters("adjacent_letters") == "adjacent_lrs"
assert adjacent_letters("") == ""
assert adjacent_letters("aaa") == "a"
assert adjacent_letters("ABBA") == ""
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Dec. 5, 2025
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