彻底搞清楚了原理，读懂了算法，读懂了源代码的文档，读懂了源代码的注释，再coding
Read Everything, Cover to Cover
It's very common for people to try to debug something without thoroughly reading the manual for the system they're using. They've skimmed it, looking at the sections they thought were important, but the section they didn't read held the clue to what was wrong. Heck, that's how I ended up struggling with the ... at one o'clock in the morning.
-- David J. Agans, Chap 3, p12, Debugging: The 9 indispensable Rules for Finding Even the Most Elusive Software and Hardware Problems
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