摘要：Description　求∑∑((n mod i)*(m mod j))其中1#include #include #include #include #include #include #include #include #include #define LL long long#define MO... 阅读全文

摘要：DescriptionGood news for us: to release the financial pressure, the government started selling galaxies and we can buy them from now on! The first one... 阅读全文

摘要：DescriptionThere are n people standing in a line. Each of them has a unique id number.Now the Ragnarok is coming. We should choose 3 people to defend ... 阅读全文

摘要：DescriptionF(n) = (n % 1) + (n % 2) + (n % 3) + ...... (n % n)。其中%表示Mod，也就是余数。例如F(6) = 6 % 1 + 6 % 2 + 6 % 3 + 6 % 4 + 6 % 5 + 6 % 6 = 0 + 0 + 0 + 2 +... 阅读全文

摘要：DescriptionEdwardhasasetofnintegers{a1,a2,...,an}.Herandomlypicksanonemptysubset{x1,x2,…,xm}(eachnonemptysubsethasequalprobabilitytobepicked),andwould... 阅读全文

摘要：DescriptionAliceisplayingagamewithBob.AliceshowsNintegersa1,a2,…,aN,andM,K.Shesayseachintegers1≤ai≤M.AndnowAlicewantstoaskforeachd=1toM,howmanydiffere... 阅读全文

摘要：DescriptionAs we know, any positive integer C ( C >= 2 ) can be written as the multiply of some prime numbers:C = p1×p2× p3× ... × pkwhich p1, p2 ... ... 阅读全文

摘要：DescriptionA lattice point (x, y) in the first quadrant (x and y are integers greater than or equal to 0), other than the origin, is visible from the ... 阅读全文

摘要：DescriptionGiven 5 integers: a, b, c, d, k, you're to find x in a...b, y in c...d that GCD(x, y) = k. GCD(x, y) means the greatest common divisor of x... 阅读全文

摘要：Problem DescriptionIn Geometry, the problem of track is very interesting. Because in some cases, the track of point may be beautiful curve. For exampl... 阅读全文

摘要：Problem DescriptionGiven a prime numberC(1≤C≤2×105), and three integers k1, b1, k2(1≤k1,k2,b1≤109). Please find all pairs (a, b) which satisfied the e... 阅读全文

摘要：Problem DescriptionOne day, a useless calculator was being built by Kuros. Let's assume that number X is showed on the screen of calculator. At first,... 阅读全文

摘要：Young naturalist Bill studies ants in school. His ants feed on plant-louses that live on apple trees. Each ant colony needs its own apple tree to feed... 阅读全文

摘要：The United Nations has decided to build a new headquarters in Saint Petersburg, Russia. It will have a form of a rectangular parallelepiped and will c... 阅读全文