Untersee-boot XXI

Y_UME has just found a numberxin his right pocket. The number is a non-negative integer ranging from0to2n−1inclusively. You want to know the exact value of this number. Y_UME has super power, an...

题目描述组合数C_n^mCnm​表示的是从nn个物品中选出mm个物品的方案数。举个例子，从(1,2,3) 三个物品中选择两个物品可以有(1,2),(1,3),(2,3)(1,2),(1,3),(2,3)这三种选择方法。根据组合数的定义，我们可以给出计算组合数C_n^mCnm​的一般公式：Cnm​=m!/(n−m)!n!​其中n!=1×2×⋯×n；特别地，定义0...

题目描述We have N clocks. The hand of the i-th clock (1≤i≤N) rotates through 360° in exactly Ti seconds.Initially, the hand of every clock stands still, pointing directly upward.Now, Dolphin starts al...

Rectanglefrog has a piece of paper divided intonrows andmcolumns. Today, she would like to draw a rectangle whose perimeter is not greater thank.弗雷格有一张被分成n行m列的纸，如今，她想在这画一个周长不大于k的矩形。There ...

Everyone knows there is a computer game names "hearth stone", recently xzz likes this game very much. If you want to win, you need both capacity and good luck.每人都知道有一个游戏叫做“炉石传说”（贵游大佬orz），最近小粽子很喜欢这个游...

Given the value of low, high you will have to find the value of the following expression:给你下界和上界的值，你得算出以下表达式的值：If you try to find the value of the above expression in a straightforward way, the...

DescriptionLittle Sub likes Math. Now he has a simple counting problem for you.小撒布喜欢数学，现在他有个简单问题要问你。Given an positive integer sequence A, for each Ai, Please calculate how many elements Aj in the...

DescriptionLittle Sub has learned a new word ’Triple’, which usually means a group with three elements in it. Now he comes up with an interesting problem for you.小撒布学了一个新单词：“Triple”，这个词经常用来表示一个三个元...

Bobo has a triangle ABC withA(x1,y1),B(x2,y2 andC(x3,y3). Picking a point P uniformly in triangle ABC, he wants to know the expectation valueE=max{SPAB,SPBC,SPCA}whereSXYZ denotes the area of tria...

进入报名链接）~ Worker Time Limit: 2000/1000 MS (Java/Others)Memory Limit: 262144/262144 K (Java/Others) Total Submission(s): 216Accepted Submission(s): 63 Problem Descrip...

裴蜀定理的基本内容是】若a,b是整数,且gcd(a,b)=d，那么对于任意的整数x,y,ax+by都一定是d的倍数，特别地，一定存在整数x,y，使ax+by=d成立。如何证明这个定理呢？假设c是ax+by的最小正整数解，也即是ax+by=c，d=(a,b） 根据最大公约数的性质及同余方程的性质，可以知道：d|a,d|b,d|(ax+by) 假设r是a%c的余数，t是a/c的整除...