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Primary U.S. interstate highways are numbered 1-99. Odd numbers (like the 5 or 95 ) go north/south ...
Primary U.S. interstate highways are numbered 1-99. Odd numbers (like the 5 or 95 ) go north/south, and evens (like the 10 or 90 ) go east/west. Auxiliary highways are numbered 100-999, and service the primary highway indicated by the rightmost two digits. Thus, I-405 services I-5, and I-290 services I-90. Given a highway number, indicate whether it is a primary or auxiliary highway. If auxiliary, indicate what primary highway it serves. Also indicate if the (primary) highway runs north/south or east/west. Ex: If the input is: 90 the output is: Ex: If the input is: \[ 290 \] the output is: Ex: If the input is: \[ 0 \] the output is: See Wikipedia for more info on highway numbering.