BOJ 32315 - Cool Phone Numbers [C++]

문제

링크

풀이

#include <iostream>
#include <string>
#include <unordered_set>
using namespace std;
 
void solve(void) {
  string s; cin >> s;
  unordered_set<char> us;
  for (char c : s) us.insert(c);
 
  cout << us.size() - 1;
}
 
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
 
  solve();
  return 0;
}