What after C?

Hello guys.I have learnt C language and is well aware of the syntax. I have now started learning data structure . I want to enhance my problem solving strategy. Though i know C syntax but still in different competitions i am only able to solve 1 or 2 problems which is very less. So can u please guide me which questions i should do, to be best in problem-solving. There are a number of problems and I cant solve all of them because I get bored easily.

Author: frenzy77
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