rank userid   mark
     1  akashkum  100
     1  chenting  100
     1  isc07211  100
     1  phanthix  100
     1  wangying  100
     1  zhangxin  100
     1  zhoujing  100
     1  zhuwenbi  100
     1  zhuyi     100
    10  lohyeong   50
    10  trianaku   50
    12  johansya    0
    12  jonathan    0
    12  kohchung    0
    12  ouyongji    0
    12  trantuan    0