Bestcoder #21&&hdoj 5139 Formula 【另类打表之分块】Formula
FormulaTime Limit: 4000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 155 Accepted Submission(s): 69Problem Descriptionf(n)=(∏i=1nin−i+1)%10