View Compilation Error

0_0_21315200_4350.c: In function 'main':
0_0_21315200_4350.c:64:11: error: expected expression before '/' token
           //  return z;
           ^
0_0_21315200_4350.c:76:11: error: expected expression before '/' token
           //  nth_element(e,e+q[i],e+len);
           ^
0_0_21315200_4350.c:80:10: error: expected expression before '/' token
          //   q[i]=e[q[i]];
          ^