Args - std::string
Output:: True if string has all characters which are unique
False if string has at least one repeated char.
Assumption:: string only contains (a..z), 26 chars. */
using namespace std;
bool hasUniqueChars2( std::string str)
int check = 0;
int len = str.length();
for (int i = 0; i < len; ++i)
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std::shared_ptr cyclic references
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