Bitwise Operations tutorial #1 | XOR, Shift, Subsets

Part 1 of tutorial on bitwise operations and bit manipulation in Competitive Programming: bitwise AND, OR, XOR, left and right shift, iterating over all subsets of a set. The content is the same as in my Codeforces article https://codeforces.com/blog/entry/73490. You can find more advanced tricks in TopCoder bits tutorial https://www.topcoder.com/community/co....

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