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A regular search can miss matches that start inside a previous match. Given a string s and a substring sub, count how many times sub appears in s, including overlapping occurrences. If sub is empty, return 0.
"aaaa", "aa"3"abcabc", "abc"2"aaa", ""0def count_overlapping(s: str, sub: str) -> int:
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Accedi"aaaa", "aa"3"abcabc", "abc"2"aaa", ""0"abc", "xyz"0"aaaaa", "aaa"3"Hello, World!", "aaa"0