I want to know among top developers which interface is more used specifically for android app development

What is the way to remove duplicates from an array in place?

i dont knw anything about java programming...bt would anybody be able to enlighten me regarding design, fundamental,series,array(double dimension,single dimension)..n some more..... LOGIC'S...


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how might i discover circle in pattern..wt's i,j and k....for wt...