IntList : total 40%
    public test: 25% (5% per file for correctness, + 5% for memory leak test)
	  files: t1.cc, t2.cc, t3.cc, t4.cc
	  (correspond to posted list_1.cc, list_2.cc, list_3.cc, list_4.cc)
    private test: 15%
	  file: t7.cc, t8.cc, t9.cc

IntEArray : total 50%
    public test: 26% (10% per file for correctness, 6% for memory leak test) 
	     files: t5.cc, t6.cc
	     (correspond to posted array_1.cc, array_2.cc)
    private test: 24% (8% per file)
	     files: t10.cc, t11.cc, t12.cc

mem.cc provides overloaded global new and delete operators to do the checks
for memory leaks (so you need to compile this file into each driver to get
the correct output)