View Compilation Error

0_0_25096968_11455.c: In function 'main':
0_0_25096968_11455.c:65:5: error: expected expression before '/' token
     //freopen("in.txt", "r", stdin);
     ^
0_0_25096968_11455.c:72:9: error: expected expression before '/' token
         //sort(p, p+n, cmp_x);
         ^