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Using stack :
def superReducedString(s):
st = []
for ch in s:
if not st:
st.append(ch)
elif st and st[-1] == ch:
st.pop()
else:
st.append(ch)
return ''.join(st) if st else 'Empty String'
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Super Reduced String
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Using stack : def superReducedString(s): st = [] for ch in s: if not st: st.append(ch) elif st and st[-1] == ch: st.pop() else: st.append(ch) return ''.join(st) if st else 'Empty String'