Write a function invert(x,p,n) that returns x with the n bits that begin at position p inverted (i.e., 1 changed into 0 and vice versa), leaving the others unchanged.
As in getbits, bit position 0 is at the right end, and the n bits that begin at position p are positions p down to p+1-n. x is unsigned.
Each input line holds x, p and n in decimal, separated by spaces. Print invert(x,p,n) in decimal on a line of its own.
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