@kph_jiit

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C++ - starting point

C++ - STL ,pre-defined data-structures and algorithms, gives tools so that you do not need to re-invent the wheel, a

Hackerrank - start from 30 days of code and Problem Solving with implementation and warmup tags

Codemonk - good for learnig concepts and some good problems too

Coechef- Long Challenge, Div3 for beginners then you can give Div2

Codeforces - this is where you'll eventually end up spending most of your time, Div3->Div2