Language: C++

 1 #include<iostream>↲                                                                                                           
  2 ↲
  3 int main(){↲
  4   int x;↲
  5   int a[3];↲
  6   int i=0;↲
  7   int cnt=0;↲
  8 ↲
  9   while(std::cin>>x){↲
 10     for(int j=0;j<i;j++){_↲
 11       if(a[j]==x){↲
 12         cnt++;↲
 13       }↲
 14     }↲
 15     if(cnt==0){↲
 16       a[i]=x;↲
 17       i++;↲
 18     }↲
 19     cnt=0;↲
 20 ____↲
 21   }↲
 22 __↲
 23 ↲
 24   std::cout>>i>>std::endl;↲
 25   return 0;↲
 26 }↲

Compiler output:
a.cc:1:4: error: stray '#' in program
    1 |  1 #include<iostream>↲
      |    ^
a.cc:1:22: error: extended character ↲ is not valid in an identifier
    1 |  1 #include<iostream>↲
      |                      ^
a.cc:2:5: error: extended character ↲ is not valid in an identifier
    2 |   2 ↲
      |     ^
a.cc:3:16: error: extended character ↲ is not valid in an identifier
    3 |   3 int main(){↲
      |                ^
a.cc:4:13: error: extended character ↲ is not valid in an identifier
    4 |   4   int x;↲
      |             ^
a.cc:5:16: error: extended character ↲ is not valid in an identifier
    5 |   5   int a[3];↲
      |                ^
a.cc:6:15: error: extended character ↲ is not valid in an identifier
    6 |   6   int i=0;↲
      |               ^
a.cc:7:17: error: extended character ↲ is not valid in an identifier
    7 |   7   int cnt=0;↲
      |                 ^
a.cc:8:5: error: extended character ↲ is not valid in an identifier
    8 |   8 ↲
      |     ^
a.cc:9:26: error: extended character ↲ is not valid in an identifier
    9 |   9   while(std::cin>>x){↲
      |                          ^
a.cc:10:30: error: extended character ↲ is not valid in an identifier
   10 |  10     for(int j=0;j<i;j++){_↲
      |                              ^
a.cc:11:23: error: extended character ↲ is not valid in an identifier
   11 |  11       if(a[j]==x){↲
      |                       ^
a.cc:12:19: error: extended character ↲ is not valid in an identifier
   12 |  12         cnt++;↲
      |                   ^
a.cc:13:12: error: extended character ↲ is not valid in an identifier
   13 |  13       }↲
      |            ^
a.cc:14:10: error: extended character ↲ is not valid in an identifier
   14 |  14     }↲
      |          ^
a.cc:15:20: error: extended character ↲ is not valid in an identifier
   15 |  15     if(cnt==0){↲
      |                    ^
a.cc:16:18: error: extended character ↲ is not valid in an identifier
   16 |  16       a[i]=x;↲
      |                  ^
a.cc:17:15: error: extended character ↲ is not valid in an identifier
   17 |  17       i++;↲
      |               ^
a.cc:18:10: error: extended character ↲ is not valid in an identifier
   18 |  18     }↲
      |          ^
a.cc:19:15: error: extended character ↲ is not valid in an identifier
   19 |  19     cnt=0;↲
      |               ^
a.cc:20:5: error: extended character ↲ is not valid in an identifier
   20 |  20 ____↲
      |     ^
a.cc:21:8: error: extended character ↲ is not valid in an identifier
   21 |  21   }↲
      |        ^
a.cc:22:5: error: extended character ↲ is not valid in an identifier
   22 |  22 __↲
      |     ^
a.cc:23:5: error: extended character ↲ is not valid in an identifier
   23 |  23 ↲
      |     ^
a.cc:24:31: error: extended character ↲ is not valid in an identifier
   24 |  24   std::cout>>i>>std::endl;↲
      |                               ^
a.cc:25:16: error: extended character ↲ is not valid in an identifier
   25 |  25   return 0;↲
      |                ^
a.cc:26:6: error: extended character ↲ is not valid in an identifier
   26 |  26 }↲
      |      ^
a.cc:1:2: error: expected unqualified-id before numeric constant
    1 |  1 #include<iostream>↲
      |  ^
a.cc:26:6: error: '\U000021b2' does not name a type
   26 |  26 }↲
      |      ^