Make an experiment (Score 1)

Take, for example, one geometry problem (any) and 20 students from the same school, put them into separate classrooms, and ask them to solve that problem. Than take their solutions, and compare them, using DIFF. :-) as aomeone having a great experience in cheking exam work at university, i tell you, that half of the works will be mostly identical, and there will be probably a couple of works with original solution approaches -- not more. so my question is: how many alternative MALLOC implementations can there be?