Description 求∑∑((nmodi)*(mmodj))其中1<=i<=n,1<=j<=m,i≠j。Input第一行两个数n,m。Output 一个整数表示答案mod19940417的值SampleInput34SampleOutput1样例说明答案为(3mod1)*(4mod2)+(3mod1)*(4mod3)+(3mod1)*(4mod4)+(3mod2)*(4mod1)+(3mod2)*(4mod3)+(3mod2)*(4mod4)+(3mod3)*(4mod1)+(3mod3)*(4mod2)+(3mod3)*(4mod4)=1数据规模和约定对于100%的数据n,m<=10^9。题解 \[\sum_{i=1}^{n}\sum_{j...
Devuwantstodecoratehisgardenwithflowers.Hehaspurchased n boxes,wherethe i-thboxcontains fi flowers.Allflowersinasingleboxareofthesamecolor(hencetheyareindistinguishable).Also,notwoboxeshaveflowersofthesamecolor.NowDevuwantstoselect exactly s flowersfromtheboxestodecoratehisgarden.Devuwouldliketoknow,inhowmanydifferentwayscanheselecttheflowersfromeachbox?Sincethisnumbermaybeverylarg...
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