Today I started solving question from a2oj…but when I asked to some of my frnd they say that a2oj is old ladder nd the pattern of question is also changed in cf…Plzz suggest some good nd new ladders from problem solving. 
Today I started solving question from a2oj…but when I asked to some of my frnd they say that a2oj is old ladder nd the pattern of question is also changed in cf…Plzz suggest some good nd new ladders from problem solving.