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This post contains solutions to specific problem used in CMU 15513. If you are taking the course, please do not read further.

In this post, I will introduce you to a bug of the program. At first I thought this is a hardware bug. Then I suspect this is a compiler bug. Yet it turns out, the real issue is undefined behavior in my program. We will see how compiler makes “wrong” optimizations, when undefined behavior is involved.

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Screenshot of "Have I benn pawned" website at 'https://haveibeenpwned.com'

I know I am supposed to make weekly updates. Sorry fellows. We both know something enourmous happenned this week. A comment on recent events is going to be published someday soon. I have almost done writing it. I need time to polish it, and more importantly make sure it will not cause any trouble. As a part of my trying to keep up with the weekly update, I’m introducing you to an interesting website, Have I been pawned?.

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最近适逢2018农历新年,又是申请季,感触良多。我想找一句诗来表达这种因为环境的悄然变化而引起的心中的一些不安、激动、伤感,但奈何我文字功底实在是不及格,想来想去只有范仲淹的”不以物喜,不以己悲“。虽说是相反的意思,但若把意思反过来倒也是十分贴切。这篇东西作为整个博客的卷首语,我希望能写一些总结性质的东西。

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