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  1. import re
  2.  
  3.  
  4. def func(in_str):
  5.     print('-------')
  6.     print('in : ' + in_str)
  7.     print('out:')
  8.     print(in_str)
  9.     s = in_str
  10.     while True:
  11.         in_str = re.sub(r'(.)\1{3,}', '', in_str, 1)
  12.         if in_str == s:
  13.             return
  14.         print(in_str)
  15.         s = in_str
  16.  
  17. if __name__ == '__main__':
  18.     func('11233344433331111143322211')
  19.     func('1122224411112222')
  20.     func('211222211333312')
  21.  
Success #stdin #stdout 0.1s 10104KB
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stdin
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Standard input is empty
stdout
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-------
in : 11233344433331111143322211
out:
11233344433331111143322211
1123334441111143322211
11233344443322211
1123333322211
11222211
1111

-------
in : 1122224411112222
out:
1122224411112222
114411112222
11442222
1144
-------
in : 211222211333312
out:
211222211333312
21111333312
2333312
212
https://ideone.com/ZNq2Hz
language:
Python 3 (python  3.9.5)
created:
10 years ago
visibility:
public

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