Make String Stable [using Stack]

Given a string with opening and closing braces, our problem is to find the minimum number of operations to make the string stable. This can be solved efficiently using Stack. A string is stable based on the following rules:

An empty string is stable.If S is stable, then {S} is also stable.If S and T are both stable, then the concatenation of S and T is stable (that is ST).All of these strings are stable: {}, {}{}, and {{}{}}These strings are not stable: }{, {{}{, nor {}{.

Two operations ar...