Kickstart Round A 2017 Problem A. Square Counting 公式、数论逆元、除法取模
如果ProblemA.SquareCountingThiscontestisopenforpractice.Youcantryeveryproblemasmanytimesasyoulike,thoughwewon'tkeeptrackofwhichproblemsyousolve.ReadtheQuick-StartGuidetogetstarted.Smallinput8pointsSolve