solving problems in C program

[MnM]

Hi guys, It must be weird to see me post in this section of the forum but anyways, I have studied both c program and c++ in my second and third semester respectively. I'm having campus placements now and most of the companies need people with strong problem solving capability. So, I'm wondering if there is a website you personally have used for learning C for example: Find out whether the string having the following characters '[',']','{','}','(',')' is balanced or not {[]()} etc, etc. I am looking for a website that gives me problem statements and also the solution. I might google and get some but I'm hoping the lot of you have personally tried out some. So yeah I'm waiting for your reply!