题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include <iostream>
#include <set>
using namespace std;
int main() {
set<char> ch;
string s;
cin >> s;
for (auto c : s)
ch.insert(c);
cout << ch.size() << endl;
}
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