plz any body gives me list of some common patterns in question ask in rounds and some technique please dont ignore this persons who give me the list or some ideas has some positive DELTA in their next round ?
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2 pointers , sliding window , greedy , maths maths and maths to become 1300 imo
Maybe that's why you haven't become 1300? Div.2AB consists more of basic but crucial concepts such as parity, XOR, permutations and GCD w/ simple observations. Recently there's been more greedy problems on B, but still in a way you can find the pattern through some observation by sketching on paper.