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Given the following formula, one can set operators ‘+’ or ‘-’ instead of each ‘?’, in order to obtain a given k ?1?2? . . .?n = k For example: to obtain k = 12, the expression to be used will be:

Recursive sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 58    Accepted Submission(s): 39 Problem Description Farmer John