Uniqueness Check

Anonymous
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/*

  • Function hasUniqueChars2
  • 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. */
#include<iostream>
#include<string>
using namespace std;
bool hasUniqueChars2( std::string str)
{
int check = 0;
int len = str.length();
for (int i = 0; i < len; ++i)
{
int c = (int)(str[i] - 'a');
cout << c << endl;
if ( check & ( 1 << c ) ) {
return false;
}
check |= ( 1 << c);
}
return true;
}
int main()
{
std::string in="abbc";
cout << hasUniqueChars2(in) << endl;
}
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