1 Canvas教程 <canvas>是一个新的用于通过脚本(通常是JavaScript)绘图的HTML元素.例如,他可以用于绘图.制作图片的组合或者简单的动画(当然并不那么简单).It can for instance be used to draw graphs, make photo compositions or do simple (and not so simple) animations. 1.1 基本用法 Basic usage <canvas>元素 Let's s…
D. Area of Two Circles' Intersection time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given two circles. Find the area of their intersection. Input The first line contains three int…
Limak is a little bear who learns to draw. People usually start with houses, fences and flowers but why would bears do it? Limak lives in the forest and he decides to draw a tree. Recall that tree is a connected graph consisting of n vertices and n -…
B. Bear and Finding Criminals 链接:http://codeforces.com/contest/680/problem/B There are n cities in Bearland, numbered 1 through n. Cities are arranged in one long row. The distance between cities i and j is equal to |i - j|. Limak is a police officer…
B. Ancient Berland Hieroglyphs 题目连接: http://codeforces.com/problemset/problem/164/B Descriptionww.co Polycarpus enjoys studying Berland hieroglyphs. Once Polycarp got hold of two ancient Berland pictures, on each of which was drawn a circle of hierog…
A. Fox And Snake 题目连接: http://codeforces.com/contest/510/problem/A Description Fox Ciel starts to learn programming. The first task is drawing a fox! However, that turns out to be too hard for a beginner, so she decides to draw a snake instead. A sna…
