CHFNSWAP - Editorial

[keshav_7]

You used int, so integer overflow

Simple Trick to Detect Integer Overflow (C/C++)

Getting WA on your submission but can’t figure out why? There are many, many possibilities, but one (which crops up all the time) is Integer Overflow. There’s a very simple way to see if your submission is triggering one of these: simply add #pragma GCC optimize "trapv" to the top of your submission, and instead of silently overflowing an int and giving a WA, your program will crash and give a RE. For example, the only difference between this WA submission and this RE submission is the use o…

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