fix: 修改代码可读性

feat: GCD

Merge branch 'master' of https://github.com/azl397985856/leetcode

Merge branch 'master' of https://github.com/azl397985856/leetcode

Merge branch 'master' of https://github.com/azl397985856/leetcode

fix: 增加图

feat: azl397985856#60

feat: #1011

feat: update azl397985856#232 and azl397985856#53 (azl397985856#259)

feat: #1019