Master substring extraction in Python using slicing. ... 1️⃣ Negative indices count from the end of the string. For example, s[-1] gives the last character. 2️⃣ To slice, ...

Give a string s, count the number of non-empty (contiguous) substrings that have the same number of 0's and 1's, and all the 0's and all the 1's in these substrings are grouped consecutively.

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