a bug in LFU-DA

[1a1a11a]

example command

./bin/cachesim ../_build/data.csv csv lfuda 0.8,0.9 -t "time-col=1,obj-id-col=3,obj-size-col=4,delimiter=,,obj-id-is-num=0"

example data

# timestamp (ms), op type [Put:0, Get:1, Delete:2, Head: 3, Copy: 4], object id, object size (byte)
0,1,A,8371
103,1,B,31
159,1,C,3668
315,1,D,15572
418,1,E,62099
529,1,F,7621
881,1,G,1316252
956,1,H,104330
1026,1,I,4778