process_str_special_op1.py (961B)
| # 3612. Process String with Special Operations I
"""
you are given a string 's' containing lowercase english letters and the
special characters '*', '#', and '%'. build a new string 'result' by
processing 's' according to the following rules from left to right: if the
letter is a lowercase english letter append it to 'result'. a '*' removes the
last character from 'result'. a '#' duplicates the current 'result' and
appends it to itself. a '%' reverses the current 'result'. return the
resulting string.
"""
class Solution:
def processStr(self, s: str) -> str:
ans = ""
for c in s:
if c == "*":
ans = ans[:-1]
elif c == "#":
ans += ans
elif c == "%":
ans = ans[::-1]
else:
ans += c
return ans
if __name__ == "__main__":
obj = Solution()
print(obj.processStr(s="a#b%*"))
print(obj.processStr(s="z*#"))
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