I once spoke to my priest about this very topic and he reminded me that to be tempted is not a sin. After all, Christ Himself was tempted. It\'s what we do with that temptation that may (or may not) be a sin.
However, to more directly answer your question, say the Jesus Prayer (Lord Jesus Christ, Son of God, have mercy on me, a sinner). Hopefully, by repeating this prayer as you walk across campus (or the mall, or wherever you may be tempted), it will focus your mind on Christ and not lead your mind wonder into sinfulness from temptation.
Hope that helps.
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