rank userid    1 2 3 4 sum
     1  akashkum  2 3 4 1  10
     1  wangying  2 3 4 1  10
     1  zhuwenbi  2 3 4 1  10
     1  zhuyi     2 3 4 1  10
     5  trantuan  1 3 4 1   9
     6  isc07211  2 3 1 1   7
     6  kohchung  2 3 1 1   7
     6  phanthix  2 3 1 1   7
     6  trianaku  2 3 1 1   7
     6  zhangxin  2 3 1 1   7
     6  zhoujing  2 3 1 1   7
    12  chenting  1 3 1 1   6
    12  johansya  1 3 1 1   6
    12  jonathan  1 3 1 1   6
    12  ouyongji  2 3 0 1   6
    16  lohyeong  0 0 0 0   0