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Problem Solving

Problem statement

The Gammal Tech file system keeps a log each time some user performs a change folder operation.

The operations are described below:

  • "../" : Move to the parent folder of the current folder. (If you are already in the main folder, remain in the same folder).
  • "./" : Remain in the same folder.
  • "gammal/" : Move to the child folder named gammal (This folder is guaranteed to always exist).

You are given a list of strings s[i] where is the operation performed by the user..


1 <= s.length <= 103

2 <= s[i].length <= 10


print the minimum number of operations needed to go back to the main folder after the change folder operations.

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