Language: C++

#include <iostream>
#include <cmath>
using namespace std;

int main(void){
ツ　ツ　double x1, y1, x2, y2, x3, y3, px, py;
ツ　ツ　double a, b, c, ap, bp, cp;
ツ　ツ　double tmp;
ツ　ツ　double s2, sa2, sb2, sc2;
ツ　ツ　double s, sa, sb, sc;

ツ　ツ　while(cin>>x1>>y1>>x2>>y2>>x3>>y3>>px>>py){
ツ　ツ　ツ　ツ　a = sqrt(fabs((x2-x3) * (x2-x3) + (y2-y3) * (y2-y3)));
ツ　ツ　ツ　ツ　b = sqrt(fabs((x1-x3) * (x1-x3) + (y1-y3) * (y1-y3)));
ツ　ツ　ツ　ツ　c = sqrt(fabs((x1-x2) * (x1-x2) + (y1-y2) * (y1-y2)));
ツ　ツ　ツ　ツ　ap = sqrt(fabs((x1-px) * (x1-px) + (y1-py) * (y1-py)));
ツ　ツ　ツ　ツ　bp = sqrt(fabs((x2-px) * (x2-px) + (y2-py) * (y2-py)));
ツ　ツ　ツ　ツ　cp = sqrt(fabs((x3-px) * (x3-px) + (y3-py) * (y3-py)));
ツ　ツ　ツ　ツ　
ツ　ツ　ツ　ツ　tmp = (a+b+c) / 2;
ツ　ツ　ツ　ツ　s2 = tmp * (tmp-a) * (tmp-b) * (tmp-c);
ツ　ツ　ツ　ツ　s = sqrt(s2);
ツ　ツ　ツ　ツ　tmp = (a+bp+cp) / 2;
ツ　ツ　ツ　ツ　sa2 = tmp * (tmp-a) * (tmp-bp) * (tmp-cp);
ツ　ツ　ツ　ツ　sa = sqrt(sa2);
ツ　ツ　ツ　ツ　tmp = (b+ap+cp) / 2;
ツ　ツ　ツ　ツ　sb2 = tmp * (tmp-b) * (tmp-ap) * (tmp-cp);
ツ　ツ　ツ　ツ　sb = sqrt(sb2);
ツ　ツ　ツ　ツ　tmp = (c+ap+bp) / 2;
ツ　ツ　ツ　ツ　sc2 = tmp * (tmp-c) * (tmp-ap) * (tmp-bp);
ツ　ツ　ツ　ツ　sc = sqrt(sc2);
ツ　ツ　ツ　ツ　if(fabs(sa+sb+sc-s) < ie-9) cout << "YES" << endl;
ツ　ツ　ツ　ツ　else cout << "NO" << endl;
ツ　ツ　}
ツ　ツ　return 0;
}

Compiler output:
a.cc:6:1: error: extended character 　 is not valid in an identifier
    6 | ツ　ツ　double x1, y1, x2, y2, x3, y3, px, py;
      | ^
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 | ツ　ツ　double a, b, c, ap, bp, cp;
      | ^
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 | ツ　ツ　double tmp;
      | ^
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 | ツ　ツ　double s2, sa2, sb2, sc2;
      | ^
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 | ツ　ツ　double s, sa, sb, sc;
      | ^
a.cc:10:1: error: extended character 　 is not valid in an identifier
a.cc:12:1: error: extended character 　 is not valid in an identifier
   12 | ツ　ツ　while(cin>>x1>>y1>>x2>>y2>>x3>>y3>>px>>py){
      | ^
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 | ツ　ツ　ツ　ツ　a = sqrt(fabs((x2-x3) * (x2-x3) + (y2-y3) * (y2-y3)));
      | ^
a.cc:13:1: error: extended character 　 is not valid in an identifier
a.cc:13:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　b = sqrt(fabs((x1-x3) * (x1-x3) + (y1-y3) * (y1-y3)));
      | ^
a.cc:14:1: error: extended character 　 is not valid in an identifier
a.cc:14:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　c = sqrt(fabs((x1-x2) * (x1-x2) + (y1-y2) * (y1-y2)));
      | ^
a.cc:15:1: error: extended character 　 is not valid in an identifier
a.cc:15:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　ap = sqrt(fabs((x1-px) * (x1-px) + (y1-py) * (y1-py)));
      | ^
a.cc:16:1: error: extended character 　 is not valid in an identifier
a.cc:16:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　bp = sqrt(fabs((x2-px) * (x2-px) + (y2-py) * (y2-py)));
      | ^
a.cc:17:1: error: extended character 　 is not valid in an identifier
a.cc:17:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　cp = sqrt(fabs((x3-px) * (x3-px) + (y3-py) * (y3-py)));
      | ^
a.cc:18:1: error: extended character 　 is not valid in an identifier
a.cc:18:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　
      | ^
a.cc:19:1: error: extended character 　 is not valid in an identifier
a.cc:19:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　tmp = (a+b+c) / 2;
      | ^
a.cc:20:1: error: extended character 　 is not valid in an identifier
a.cc:20:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　s2 = tmp * (tmp-a) * (tmp-b) * (tmp-c);
      | ^
a.cc:21:1: error: extended character 　 is not valid in an identifier
a.cc:21:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　s = sqrt(s2);
      | ^
a.cc:22:1: error: extended character 　 is not valid in an identifier
a.cc:22:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　tmp = (a+bp+cp) / 2;
      | ^
a.cc:23:1: error: extended character 　 is not valid in an identifier
a.cc:23:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　sa2 = tmp * (tmp-a) * (tmp-bp) * (tmp-cp);
      | ^
a.cc:24:1: error: extended character 　 is not valid in an identifier
a.cc:24:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　sa = sqrt(sa2);
      | ^
a.cc:25:1: error: extended character 　 is not valid in an identifier
a.cc:25:1: error: extended character 　 is not valid in an identifier
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 | ツ　ツ　ツ　ツ　tmp = (b+ap+cp) / 2;
      | ^
a.cc:26:1: error: extended character 　 is not valid in an identifier
a.cc:26:1: error: extended character 　 is not valid in an identifier
a.cc:26:1: error: extended character 　 is not valid in an identifier
a.cc:27:1: error: extended character 　 is not valid in an identifier
   27 | ツ　ツ　ツ　ツ　sb2 = tmp * (tmp-b) * (tmp-ap) * (tmp-cp);
      | ^
a.cc:27:1: error: extended character 　 is not valid in an identifier
a.cc:27:1: error: extended character 　 is not valid in an identifier
a.cc:27:1: error: extended character 　 is not valid in an identifier
a.cc:28:1: error: extended character 　 is not valid in an identifier
   28 | ツ　ツ　ツ　ツ　sb = sqrt(sb2);
      | ^
a.cc:28:1: error: extended character 　 is not valid in an identifier
a.cc:28:1: error: extended character 　 is not valid in an identifier
a.cc:28:1: error: extended character 　 is not valid in an identifier
a.cc:29:1: error: extended character 　 is not valid in an identifier
   29 | ツ　ツ　ツ　ツ　tmp = (c+ap+bp) / 2;
      | ^
a.cc:29:1: error: extended character 　 is not valid in an identifier
a.cc:29:1: error: extended character 　 is not valid in an identifier
a.cc:29:1: error: extended character 　 is not valid in an identifier
a.cc:30:1: error: extended character 　 is not valid in an identifier
   30 | ツ　ツ　ツ　ツ　sc2 = tmp * (tmp-c) * (tmp-ap) * (tmp-bp);
      | ^
a.cc:30:1: error: extended character 　 is not valid in an identifier
a.cc:30:1: error: extended character 　 is not valid in an identifier
a.cc:30:1: error: extended character 　 is not valid in an identifier
a.cc:31:1: error: extended character 　 is not valid in an identifier
   31 | ツ　ツ　ツ　ツ　sc = sqrt(sc2);
      | ^
a.cc:31:1: error: extended character 　 is not valid in an identifier
a.cc:31:1: error: extended character 　 is not valid in an identifier
a.cc:31:1: error: extended character 　 is not valid in an identifier
a.cc:32:1: error: extended character 　 is not valid in an identifier
   32 | ツ　ツ　ツ　ツ　if(fabs(sa+sb+sc-s) < ie-9) cout << "YES" << endl;
      | ^
a.cc:32:1: error: extended character 　 is not valid in an identifier
a.cc:32:1: error: extended character 　 is not valid in an identifier
a.cc:32:1: error: extended character 　 is not valid in an identifier
a.cc:33:1: error: extended character 　 is not valid in an identifier
   33 | ツ　ツ　ツ　ツ　else cout << "NO" << endl;
      | ^
a.cc:33:1: error: extended character 　 is not valid in an identifier
a.cc:33:1: error: extended character 　 is not valid in an identifier
a.cc:33:1: error: extended character 　 is not valid in an identifier
a.cc:34:1: error: extended character 　 is not valid in an identifier
   34 | ツ　ツ　}
      | ^
a.cc:34:1: error: extended character 　 is not valid in an identifier
a.cc:35:1: error: extended character 　 is not valid in an identifier
   35 | ツ　ツ　return 0;
      | ^
a.cc:35:1: error: extended character 　 is not valid in an identifier
a.cc: In function 'int main()':
a.cc:6:1: error: '\U000030c4\U00003000\U000030c4\U00003000double' was not declared in this scope
    6 | ツ　ツ　double x1, y1, x2, y2, x3, y3, px, py;
      | ^~~~~~~~~~~~~~
a.cc:7:15: error: expected ';' before 'a'
    7 | ツ　ツ　double a, b, c, ap, bp, cp;
      |               ^~
      |               ;
a.cc:8:15: error: expected ';' before 'tmp'
    8 | ツ　ツ　double tmp;
      |               ^~~~
      |               ;
a.cc:9:15: error: expected ';' before 's2'
    9 | ツ　ツ　double s2, sa2, sb2, sc2;
      |               ^~~
      |               ;
a.cc:10:15: error: expected ';' before 's'
   10 | ツ　ツ　double s, sa, sb, sc;
      |               ^~
      |               ;
a.cc:12:20: error: 'x1' was not declared in this scope; did you mean 'y1'?
   12 | ツ　ツ　while(cin>>x1>>y1>>x2>>y2>>x3>>y3>>px>>py){
      |                    ^~
      |                    y1
a.cc:12:28: error: 'x2' was not declared in this scope
   12 | ツ　ツ　while(cin>>x1>>y1>>x2>>y2>>x3>>y3>>px>>py){
      |                            ^~
a.cc:12:32: e