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参考：https://leetcode.com/discuss/general-discussion/136588/Is-there-any-keyboard-shortcut-to-run-code-and-submit-solution/346347
leetcode.com 于 2019 年 9 月取消了提交代码的快捷键（Ctrl/Cmd + Enter）。 此脚本用于恢复此快捷键。
测试页面：Two Sum - LeetCode
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来自 Is there any keyboard shortcut to run code and submit solution? - LeetCode Discuss：
rainierClimber September 19, 2019 5:55 AM
I am not able to use CMD+ENTER anymore to submit. This is annoying. Any one else?rainierClimber September 19, 2019 5:57 AM
@1337c0d3r Is this done intentionally?1337c0d3r September 19, 2019 3:28 PM
Yes, this is done intentionally, as we believe submit solution is a heavy action, and user should only submit when they’re sure their program works.