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; }