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Read three lines at a time
I here have a simple input file the first line is i/u, i stands for intersect and u stands for union and the following two lines are numbers like this 2 3 5 4 6 7 if the first line is i i 2 3 5 4 5 7 my output is suppose to look like this: 5 if the first line is u u 2 3 5 4 5 7 my ouput is...
