finding no of unique characters in a string c 2b 2b

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Marie
11 Jan 2020
1int countDistinct(string s) 
2{ 
3
4    unordered_map<char, int> m; 
5
6    for (int i = 0; i < s.length(); i++) { 
7        m[s[i]]++; 
8    } 
9
10    return m.size(); 
11}
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