See complete series on data structures here:
http://www.youtube.com/playlist?list=PL2_aWCzGMAwI3W_JlcBbtYTwiQSsOTa6P
Algorithm or program to check for balanced parentheses in an expression using stack data structure. This is a popular programming interview question.
See source code here:
https://gist.github.com/mycodeschool/7207410
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