各位能稍微讲解一下，或给个相关参考文献链接之类的么？题目如下
There is a log file containing 1 million integers. Each integer is 32 bits
in length. Specific integer values in the log file may be repeated. It is
possible to read the log file sequentially. It is possible to read and write
temp files sequentially; however, no more than 2000 integers may be read
into memory at any given time. There is no limit to the number of files that
may be open at any time.
Objective: Produce a histogram showing absolute counts for each int
