Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
typedef vector<int> VI;

template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }
#define _overload3(_1,_2,_3,name,...) name
#define _rep(i,n) repi(i,0,n)
#define repi(i,a,b) for(int i=int(a);i<int(b);++i)
#define rep(...) _overload3(__VA_ARGS__,repi,_rep,)(__VA_ARGS__)
#define all(x) (x).begin(),(x).end()


int main() {
    int n;
    string s;
    cin >> n >> s;
    vector<int> ctr(26, 0);
    rep (i, s.size()) {
        ctr[s[i] - 'a']++;
    }
    ll mod = 1e9 + 7;
    ll ans = 1;
    rep (i, 26) {
        ans *= ctr[i] + 1;#include <bits/stdc++.h>
        using namespace std;
        typedef long long ll;
        typedef pair<int,int> P;
        typedef vector<int> VI;

        template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
        template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }
#define _overload3(_1,_2,_3,name,...) name
#define _rep(i,n) repi(i,0,n)
#define repi(i,a,b) for(int i=int(a);i<int(b);++i)
#define rep(...) _overload3(__VA_ARGS__,repi,_rep,)(__VA_ARGS__)
#define all(x) (x).begin(),(x).end()


        int main() {
            int n;
            string s;
            cin >> n >> s;
            vector<int> ctr(26, 0);
            rep (i, s.size()) {
                ctr[s[i] - 'a']++;
            }
            ll mod = 1e9 + 7;
            ll ans = 1;
            rep (i, 26) {
                ans *= ctr[i] + 1;
                ans %= mod;
            }
            cout << (ans - 1) % mod << endl;

        }
    }
    cout << ans - 1 << endl;

}

Compiler output:
a.cc:27:27: error: stray '#' in program
   27 |         ans *= ctr[i] + 1;#include <bits/stdc++.h>
      |                           ^
a.cc: In function 'int main()':
a.cc:27:28: error: 'include' was not declared in this scope
   27 |         ans *= ctr[i] + 1;#include <bits/stdc++.h>
      |                            ^~~~~~~
a.cc:27:37: error: 'bits' was not declared in this scope
   27 |         ans *= ctr[i] + 1;#include <bits/stdc++.h>
      |                                     ^~~~
a.cc:27:42: error: 'stdc' was not declared in this scope; did you mean 'std'?
   27 |         ans *= ctr[i] + 1;#include <bits/stdc++.h>
      |                                          ^~~~
      |                                          std
a.cc:28:9: error: expected primary-expression before 'using'
   28 |         using namespace std;
      |         ^~~~~
a.cc:33:9: error: a template declaration cannot appear at block scope
   33 |         template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
      |         ^~~~~~~~
a.cc:42:17: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   42 |         int main() {
      |                 ^~
a.cc:42:17: note: remove parentheses to default-initialize a variable
   42 |         int main() {
      |                 ^~
      |                 --
a.cc:42:17: note: or replace parentheses with braces to value-initialize a variable
a.cc:42:20: error: a function-definition is not allowed here before '{' token
   42 |         int main() {
      |                    ^