answer.code:2:13: error: expected identifier or ‘(’ before ‘if’
    2 |             if(student[i]==-1)//?????
      |             ^~
answer.code:6:9: error: expected identifier or ‘(’ before ‘}’ token
    6 |         }
      |         ^
answer.code:7:9: warning: data definition has no type or storage class
    7 |         cmp();//?????
      |         ^~~
answer.code:7:9: warning: type defaults to ‘int’ in declaration of ‘cmp’ [-Wimplicit-int]
answer.code:8:9: error: expected identifier or ‘(’ before ‘for’
    8 |         for(i=N*2; i>=1; i--)
      |         ^~~
answer.code:8:21: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘>=’ token
    8 |         for(i=N*2; i>=1; i--)
      |                     ^~
answer.code:8:27: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘--’ token
    8 |         for(i=N*2; i>=1; i--)
      |                           ^~
answer.code:15:9: error: expected identifier or ‘(’ before ‘return’
   15 |         return;
      |         ^~~~~~
answer.code:16:5: error: expected identifier or ‘(’ before ‘}’ token
   16 |     }
      |     ^
answer.code:17:5: error: expected identifier or ‘(’ before ‘else’
   17 |     else if(count1==N)//1????
      |     ^~~~
answer.code:37:5: error: expected identifier or ‘(’ before ‘else’
   37 |     else//???????
      |     ^~~~
answer.code:153:1: error: expected identifier or ‘(’ before ‘}’ token
  153 | }
      | ^
answer.code:155:6: error: conflicting types for ‘cmp’
  155 | void cmp(void)
      |      ^~~
answer.code:7:9: note: previous declaration of ‘cmp’ was here
    7 |         cmp();//?????
      |         ^~~
answer.code: In function ‘cmp’:
answer.code:158:11: error: ‘M’ undeclared (first use in this function)
  158 |     for(i=M; i>=1; i--)
      |           ^
answer.code:158:11: note: each undeclared identifier is reported only once for each function it appears in
answer.code:160:12: error: ‘min_student’ undeclared (first use in this function)
  160 |         if(min_student[a[i][0]]==min_student[a[i][1]]&&student[a[i][0]]!=student[a[i][1]])//min???student???
      |            ^~~~~~~~~~~
answer.code:160:24: error: ‘a’ undeclared (first use in this function)
  160 |         if(min_student[a[i][0]]==min_student[a[i][1]]&&student[a[i][0]]!=student[a[i][1]])//min???student???
      |                        ^
answer.code:160:56: error: ‘student’ undeclared (first use in this function)
  160 |         if(min_student[a[i][0]]==min_student[a[i][1]]&&student[a[i][0]]!=student[a[i][1]])//min???student???
      |                                                        ^~~~~~~
answer.code:163:19: error: ‘N’ undeclared (first use in this function)
  163 |             for(j=N*2; j>=1; j--)
      |                   ^