I am trying to solve the problems for schools in the practice mode, but I can’t get 100 points in any problem yet ( I only got 36-50 points), my question is which things I should learn and which books I should read to solve at 100% this problems???
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You are not able to get 100 pts because u are brute forcing the question… Just try to optimize ur approach as much as possible to solve any question…
Coming to books ,acc. to me Cormen is best for learning algorithms…
Happy Coding 
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I agree with @grayhathacker , moreover most of them have featured in the previous lunch times and thus if in case you get less points , then do make good use of EDITORIALS for those problems .
All the Best
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Thanks you both!!, I need more training and coding
Thanks you both!!, I need more training and coding
The book by “Cormen” on algorithms would definitely help.