Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(void){
    int a,b;
　　cin >> a >> b;
　　
　　int ans = 10;
　　int tax_eight = 0;
　　int tax_ten = 0;
　　while(1){
　　    tax_eight = floor(ans * 0.08);
　　    tax_ten = floor(ans * 0.1);
　　    
　　    if(tax_eight == a and tax_ten == b){
　　        cout << ans;
　　        break;
　　    }
　　    if(ans == 1001){
　　        cout << -1;
　　        break;
　　    }
　　    
　　    ans++;
　　}
　　
　　return 0;
}

Compiler output:
a.cc:5:1: error: extended character 　 is not valid in an identifier
    5 | 　　cin >> a >> b;
      | ^
a.cc:5:1: error: extended character 　 is not valid in an identifier
a.cc:6:1: error: extended character 　 is not valid in an identifier
    6 | 　　
      | ^
a.cc:6:1: error: extended character 　 is not valid in an identifier
a.cc:7:1: error: extended character 　 is not valid in an identifier
    7 | 　　int ans = 10;
      | ^
a.cc:7:1: error: extended character 　 is not valid in an identifier
a.cc:8:1: error: extended character 　 is not valid in an identifier
    8 | 　　int tax_eight = 0;
      | ^
a.cc:8:1: error: extended character 　 is not valid in an identifier
a.cc:9:1: error: extended character 　 is not valid in an identifier
    9 | 　　int tax_ten = 0;
      | ^
a.cc:9:1: error: extended character 　 is not valid in an identifier
a.cc:10:1: error: extended character 　 is not valid in an identifier
   10 | 　　while(1){
      | ^
a.cc:10:1: error: extended character 　 is not valid in an identifier
a.cc:11:1: error: extended character 　 is not valid in an identifier
   11 | 　　    tax_eight = floor(ans * 0.08);
      | ^
a.cc:11:1: error: extended character 　 is not valid in an identifier
a.cc:12:1: error: extended character 　 is not valid in an identifier
   12 | 　　    tax_ten = floor(ans * 0.1);
      | ^
a.cc:12:1: error: extended character 　 is not valid in an identifier
a.cc:13:1: error: extended character 　 is not valid in an identifier
   13 | 　　
      | ^
a.cc:13:1: error: extended character 　 is not valid in an identifier
a.cc:14:1: error: extended character 　 is not valid in an identifier
   14 | 　　    if(tax_eight == a and tax_ten == b){
      | ^
a.cc:14:1: error: extended character 　 is not valid in an identifier
a.cc:15:1: error: extended character 　 is not valid in an identifier
   15 | 　　        cout << ans;
      | ^
a.cc:15:1: error: extended character 　 is not valid in an identifier
a.cc:16:1: error: extended character 　 is not valid in an identifier
   16 | 　　        break;
      | ^
a.cc:16:1: error: extended character 　 is not valid in an identifier
a.cc:17:1: error: extended character 　 is not valid in an identifier
   17 | 　　    }
      | ^
a.cc:17:1: error: extended character 　 is not valid in an identifier
a.cc:18:1: error: extended character 　 is not valid in an identifier
   18 | 　　    if(ans == 1001){
      | ^
a.cc:18:1: error: extended character 　 is not valid in an identifier
a.cc:19:1: error: extended character 　 is not valid in an identifier
   19 | 　　        cout << -1;
      | ^
a.cc:19:1: error: extended character 　 is not valid in an identifier
a.cc:20:1: error: extended character 　 is not valid in an identifier
   20 | 　　        break;
      | ^
a.cc:20:1: error: extended character 　 is not valid in an identifier
a.cc:21:1: error: extended character 　 is not valid in an identifier
   21 | 　　    }
      | ^
a.cc:21:1: error: extended character 　 is not valid in an identifier
a.cc:22:1: error: extended character 　 is not valid in an identifier
   22 | 　　
      | ^
a.cc:22:1: error: extended character 　 is not valid in an identifier
a.cc:23:1: error: extended character 　 is not valid in an identifier
   23 | 　　    ans++;
      | ^
a.cc:23:1: error: extended character 　 is not valid in an identifier
a.cc:24:1: error: extended character 　 is not valid in an identifier
   24 | 　　}
      | ^
a.cc:24:1: error: extended character 　 is not valid in an identifier
a.cc:25:1: error: extended character 　 is not valid in an identifier
   25 | 　　
      | ^
a.cc:25:1: error: extended character 　 is not valid in an identifier
a.cc:26:1: error: extended character 　 is not valid in an identifier
   26 | 　　return 0;
      | ^
a.cc:26:1: error: extended character 　 is not valid in an identifier
a.cc: In function 'int main()':
a.cc:5:1: error: '\U00003000\U00003000cin' was not declared in this scope
    5 | 　　cin >> a >> b;
      | ^~~~~~~
a.cc:6:1: error: '\U00003000\U00003000' was not declared in this scope
    6 | 　　
      | ^~~~
a.cc:8:1: error: '\U00003000\U00003000int' was not declared in this scope
    8 | 　　int tax_eight = 0;
      | ^~~~~~~
a.cc:9:8: error: expected ';' before 'tax_ten'
    9 | 　　int tax_ten = 0;
      |        ^~~~~~~~
      |        ;
a.cc:10:1: error: '\U00003000\U00003000while' was not declared in this scope
   10 | 　　while(1){
      | ^~~~~~~~~
a.cc:25:5: error: expected ';' before '\U00003000\U00003000return'
   25 | 　　
      |     ^
      |     ;
   26 | 　　return 0;
      | ~~~~~~~~~~