题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include <iostream>
#include <unordered_map>
#include <unordered_set>
using namespace std;
int main() {
unordered_set<char> set;
string s;
cin >> s;
for(auto x : s){
set.insert(x);
}
int count = 0;
for(auto cut : set) count++;
cout << count << endl;
}
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