Yes, each test has only one valid solution. And changing the order of the file fragments should not break code, either. Regarding Test 54: '0,00,10,1' can have only '100' as a valid solution. If you get '000' then the other fragemnt would be '101' or '110' which cannot be as all files were identical, now you got two non-identical files. I'll rotate a couple of tests, change the order of fragments. The winning code has to pass this.
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There are two types of vessels, submarines and targets.
