Recca Chao 的 gitHub page

推廣網站開發,包含 Laravel 和 Kotlin 後端撰寫、自動化測試、讀書心得等。Taiwan Kotlin User Group 管理員。

View on GitHub

Hi, here's your problem today. This problem was recently asked by Twitter:

By the way, check out our NEW project AlgoPro ( for over 60+ video coding sessions with ex-Google/ex-Facebook engineers.

Given a string with only ( and ), find the minimum number of characters to add or subtract to fix the string such that the brackets are balanced.


Input: '(()()'
Output: 1


The fixed string could either be ()() by deleting the first bracket, or (()()) by adding a bracket. These are not the only ways of fixing the string, there are many other ways by adding it in different positions!

Here's some code to start with:

def fix_brackets(s):
  # Fill this in.

print fix_brackets('(()()')
# 1