题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include<bits/stdc++.h>
using namespace std;
int main() {
unordered_map<char, int>mp;
string s;
getline(cin, s);
for (auto ch : s) ++mp[ch];
cout << mp.size();
return 0;
}
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