View Compilation Error

0_0_22043246_2782.c:4:1: error: expected identifier or '(' before '/' token
 //
 ^
0_0_22043246_2782.c: In function 'work':
0_0_22043246_2782.c:10:17: error: 'n' undeclared (first use in this function)
     for (i=1;i<=n-2;i++)
                 ^
0_0_22043246_2782.c:10:17: note: each undeclared identifier is reported only once for each function it appears in
0_0_22043246_2782.c:13:21: error: 'rel' undeclared (first use in this function)
                 if (rel[i][j]+rel[i][k]+rel[j][k]==3 || rel[i][j]+rel[i][k]+rel[j][k]==0)
                     ^
0_0_22043246_2782.c: In function 'main':
0_0_22043246_2782.c:25:22: error: 'n' undeclared (first use in this function)
         scanf("%ld",&n);
                      ^
0_0_22043246_2782.c:30:34: error: 'rel' undeclared (first use in this function)
                     scanf("%ld",&rel[i][j]);
                                  ^