这是一个神必的不等式技巧,睡觉时候想的,我也不知道对不对,用就完事儿了 :/ 0.1 如图,这是一个严格上凸函数y=f(x) 它的上面有两点(x_0,y_0),(x_1,y_1) 先做出这两点的2条切线,再将这两点连起来 易观察得斜率由大到小分别是左边切线,中间连线,右边切线 证明亦不难: 由……

This is an easy algebra problem. I believe clever jgh must can solve it in 1min! We know that x-\frac{y}{z}-\frac{z}{y}=y-\frac{x}{z}-\frac{z}{x}=z-\frac{x}{y}-\frac{y}{x}=a and x {\neq}y{\neq}z (1) What is the value of x+y+z ? (2) What is the valu……

思考题 for 2020 DuiLian 二十年飞花不尽 一几度落月无穷 九州同乐 Of twenty years, the flower never withers In one eternity, the moon forever remains Enjoy it together It's 2020 soon. It's time for the biggest holiday - The Yuandan and the Chinese Ne……

思考题 about cheating Lottery Cheating Let's have some lottery! In this lottery system, a number string S and an array of integers A is predetermined. It is known that |A|=|S| and let's define A_0=0. Each user chooses a number string T(|T|=|S|). Th……

思考题 Times A shadow pokemon! Recently the famous game Pokemon SwordString was released. XGN, one of the biggest fan of Pokemon, decided to have a try. In each battle, your Pokemon can be seen as a string A and the enemy can be seen as a string B.……

思考题 in one sentence Yet Another Easy Problem Find any positive integer pair a,b so that (a+b)+(a+b)\mod k=n where k,n are given or -1 -1 if not found. Examples Input K=100 N=268 Output 200 34 Explain 200+34+(200+34)mod 100=234+34=268 Input K=100……

Solved! Difficulty: Div2E-Div2F If you prefer easier problem, please visit here 思考题 for dw Childish War (Hard) Miss. Broken Tail(Wei Duan) is the Math teacher of NFLS Class 8 Junior 3.She is a kind teacher. Miss. East(Fang Dong) is the Mat……

Solved! Difficulty: Div2D-Div2E If you prefer harder problem, please visit here 思考题 for dw Childish War (Easy) Miss. Broken Tail(Wei Duan) is the Math teacher of NFLS Class 8 Junior 3.She is a kind teacher. Miss. East(Fang Dong) is the Mat……

今天来到了rng_58的Training 2.难度是Div2. 首先一如既往的开始，我和XIZCM,ZZZYT,MK一起乘坐2路到达锁金村，在那之前和ZKY吃了西安面馆，同时读了题目。 RNG仍然先吃Pizzahut，dreamoon到场。 开始讲题，先统计过的人数（7，7，1，4，1，1）之后讲了4题，休息。 之后……

思考题 with NFLS teachers Husky Miss Husky (Shiqi Hao) is the Art teacher of NFLS Class 8 Junior 3. She is a kind teacher. But in fact, she is a spy working for NFLS. One day, she received the task to observe all the schools in Nanjing. There are N……