Spring I I heard something twittering on the balcony. Walking on my tiptoe, I reached the window, through which I spotted a turtle dove standing on the stainless-steel-made railing, with a sprig in its beak. B 2019-03-30 Life > Essay
The Beginning The bell is about to ring. The new year is in sight. Time flies as we grow and mature, leaving naivety behind. No sooner have we relived the past year in detail than we face the coming year hurriedly. 2019-01-01 Life > Essay
Light III He could feel drizzle patting his face. To the best of his ability, he stood up. Anew, darkness enveloped him. He pondered about what he had just experienced, which was patently a dreadful nightmare. 2018-12-09 Life > Essay
Light II He had no idea where he was. And a strong feeling that he had never experienced before occupied his mind little by little. The light was still there. So dim and nebulous was it that the dread of being 2018-10-02 Life > Essay
Light I He was born blind. He had suffered the darkness for years which he had been accustomed to, till that day, when something mysterious happened. Abruptly he felt a soft, faint beam pierced the darkness, 2018-09-01 Life > Essay
Notes on Physics One-dimensional motion$$\begin{align}v_f&=v_i+a \Delta t \\\Delta x&=v_i \Delta t+{a \Delta t^2 \over 2} \\\Delta x&={v_i+v_f \over 2} \Delta t \\v_f^2&=v_i^2+2a \D 2018-06-30 Life > Study #Physics
Black-White Balls 题目描述$n$ black and white balls were put into a bag. Petya doesn’t know exactly how many black balls are there among them. He knows, however, that there are $0, 1, \ldots, n$ black balls among all balls 2018-05-19 OI > Number Theory #Probability #Bayes' Theorem #Combinatorics
Fermat's Last Theorem 题目描述Given a positive integer $n$ and a positive prime number $p$, find $x, y$ and $z$ such that $x^n+y^n \equiv z^n \pmod p$ and $x, y$ and $z$ are nonzero modulo $p$ or report that there’s no such tr 2018-05-18 OI > Number Theory #Primitive Root
Friendly Points 题目描述Consider $n$ distinct points on a plane. Two points from that set are said to be friends, when there exists a rectangle with sides parallel to coordinate axes that contains those two points and do 2018-05-18 OI > Common Skill #Binary-Search #Divide-and-Conquer #Monotonic Stack
Recover Path 题目描述Traveller Gregory is famous for his ability to always choose the shortest path for his journey. Ostap is a journalist who seeks for information about the recent Gregory’s trip. He managed to get t 2018-05-17 OI > Common Skill #Dynamic Programming #Shortest Path