Language: C++

#include <bits/stdc++.h>                                                                                               │ 23     cout << nCr(m, 2) << endl;$
using namespace std;                                                                                                   │ 24 $
                                                                                                                       │ 25     cout << nm << endl;$
#define lli long long int                                                                                              │ 26 $
#define lliv vector<long long int>                                                                                     │ 27     return 0;$
                                                                                                                       │ 28 }$
int fact(int n) {                                                                                                      │~
    if (n <= 0 || n == 1)                                                                                              │~
        return 1;                                                                                                      │~
    else                                                                                                               │~
        return n * fact(n - 1);                                                                                        │~
}                                                                                                                      │~
                                                                                                                       │~
int nCr(int n, int r) { return fact(n) / (fact(r) * fact(n - r)); }                                                    │~
                                                                                                                       │~
int main(void) {                                                                                                       │~
    int n, m;                                                                                                          │~
    cin >> n >> m;                                                                                                     │~
                                                                                                                       │~
    int nm = nCr(n, 2) + nCr(m, 2);                                                                                    │~
                                                                                                                       │~
    cout << nCr(n, 2) << endl;                                                                                         │~
    cout << nCr(m, 2) << endl;                                                                                         │~
                                                                                                                       │~
    cout << nm << endl;                                                                                                │~
                                                                                                                       │~
    return 0;                                                                                                          │~
}

Compiler output:
a.cc:1:120: error: extended character │ is not valid in an identifier
    1 | #include <bits/stdc++.h>                                                                                               │ 23     cout << nCr(m, 2) << endl;$
      |                                                                                                                        ^
a.cc:1:120: warning: extra tokens at end of #include directive
    1 | #include <bits/stdc++.h>                                                                                               │ 23     cout << nCr(m, 2) << endl;$
      |                                                                                                                        ^
a.cc:2:120: error: extended character │ is not valid in an identifier
    2 | using namespace std;                                                                                                   │ 24 $
      |                                                                                                                        ^
a.cc:3:120: error: extended character │ is not valid in an identifier
    3 |                                                                                                                        │ 25     cout << nm << endl;$
      |                                                                                                                        ^
a.cc:4:120: error: extended character │ is not valid in an identifier
    4 | #define lli long long int                                                                                              │ 26 $
      |                                                                                                                        ^
a.cc:5:120: error: extended character │ is not valid in an identifier
    5 | #define lliv vector<long long int>                                                                                     │ 27     return 0;$
      |                                                                                                                        ^
a.cc:6:120: error: extended character │ is not valid in an identifier
    6 |                                                                                                                        │ 28 }$
      |                                                                                                                        ^
a.cc:7:120: error: extended character │ is not valid in an identifier
    7 | int fact(int n) {                                                                                                      │~
      |                                                                                                                        ^
a.cc:8:120: error: extended character │ is not valid in an identifier
    8 |     if (n <= 0 || n == 1)                                                                                              │~
      |                                                                                                                        ^
a.cc:9:120: error: extended character │ is not valid in an identifier
    9 |         return 1;                                                                                                      │~
      |                                                                                                                        ^
a.cc:10:120: error: extended character │ is not valid in an identifier
   10 |     else                                                                                                               │~
      |                                                                                                                        ^
a.cc:11:120: error: extended character │ is not valid in an identifier
   11 |         return n * fact(n - 1);                                                                                        │~
      |                                                                                                                        ^
a.cc:12:120: error: extended character │ is not valid in an identifier
   12 | }                                                                                                                      │~
      |                                                                                                                        ^
a.cc:13:120: error: extended character │ is not valid in an identifier
   13 |                                                                                                                        │~
      |                                                                                                                        ^
a.cc:14:120: error: extended character │ is not valid in an identifier
   14 | int nCr(int n, int r) { return fact(n) / (fact(r) * fact(n - r)); }                                                    │~
      |                                                                                                                        ^
a.cc:15:120: error: extended character │ is not valid in an identifier
   15 |                                                                                                                        │~
      |                                                                                                                        ^
a.cc:16:120: error: extended character │ is not valid in an identifier
   16 | int main(void) {                                                                                                       │~
      |                                                                                                                        ^
a.cc:17:120: error: extended character │ is not valid in an identifier
   17 |     int n, m;                                                                                                          │~
      |                                                                                                                        ^
a.cc:18:120: error: extended character │ is not valid in an identifier
   18 |     cin >> n >> m;                                                                                                     │~
      |                                                                                                                        ^
a.cc:19:120: error: extended character │ is not valid in an identifier
   19 |                                                                                                                        │~
      |                                                                                                                        ^
a.cc:20:120: error: extended character │ is not valid in an identifier
   20 |     int nm = nCr(n, 2) + nCr(m, 2);                                                                                    │~
      |                                                                                                                        ^
a.cc:21:120: error: extended character │ is not valid in an identifier
   21 |                                                                                                                        │~
      |                                                                                                                        ^
a.cc:22:120: error: extended character │ is not valid in an identifier
   22 |     cout << nCr(n, 2) << endl;                                                                                         │~
      |                                                                                                                        ^
a.cc:23:120: error: extended character │ is not valid in an identifier
   23 |     cout << nCr(m, 2) << endl;                                                                                         │~
      |                                                                                                                        ^
a.cc:24:120: error: extended character │ is not valid in an identifier
   24 |                                                                                                                        │~
      |                                                                                                                        ^
a.cc:25:120: error: extended character │ is not valid in an identifier
   25 |     cout << nm << endl;                                                                                                │~
      |                                                                                                                        ^
a.cc:26:120: error: extended character │ is not valid in an identifier
   26 |                                                                                                                        │~
      |                                                                                                                        ^
a.cc:27:120: error: extended character │ is not valid in an identifier
   27 |     return 0;                                                                                                          │~
      |                                                                                                                        ^
a.cc:2:120: error: '\U00002502' does not name a type
    2 | using namespace std;                                                                                                   │ 24 $
      |                                                                                                                        ^
a.cc:3:148: error: '$' does not name a type
    3 |                                                                                                                        │ 25     cout << nm << endl;$
      |                                                                                                                                                    ^
a.cc:6:125: error: expected declaration before '}' token
    6 |