Osajono

input/code.cpp:5:26: error: expected constructor, destructor, or type conversion before '(' token
 ios_base::sync_with_stdio(false);
                          ^

#include <iostream>
 
using namespace std;
 
ios_base::sync_with_stdio(false);
 
int main() {
 
    int n;
    cin >> n;
 
    char s[n];
    for (int i=0; i<n; ++i) {
        cin >> s[i];
    }
    int c = n;
    for (int i=0; i<n; ++i) {
        for (int j=i+1; j<n; ++j) {
            if (s[i]==s[j]) ++c;
        }
    }
 
    cout << c;
}