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This article is made by Jason-Cow.Welcome to reprint.But please post the article's address. 在线笛卡尔坐标系绘图网站 核心思想 1.积角排序 2.双端队列维护半平面交 木有啦～～ 多边形相关 主程序 读入，如 阅读全文
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This article is made by Jason-Cow.Welcome to reprint.But please post the article's address. 好好领悟一下vector吧！加一行Left还可以判断是否在直线上... Intersect(L a,L b) Ret 阅读全文
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This article is made by Jason-Cow.Welcome to reprint.But please post the article's address. 题意见白书，P272~273 把之前的板子拼起来就可以了 ans=(S(木板)*100/S(凸包))% 板子太长，先 阅读全文
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This article is made by Jason-Cow.Welcome to reprint.But please post the article's address. 关键一句话 附加，极角排序，课上讲~~ 学了Andrew后，觉得Graham好丑，而且常数还大 唯一的好处是好写，其 阅读全文
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This article is made by Jason-Cow.Welcome to reprint.But please post the article's address. 利用一下叉积和栈 阅读全文
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This article is made by Jason-Cow.Welcome to reprint.But please post the article's address. 旋转，跳跃，梦境，之间... 阅读全文
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This article is made by Jason-Cow.Welcome to reprint.But please post the article's address. 看了书，然后码 阅读全文
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This article is made by Jason-Cow.Welcome to reprint.But please post the article's address. BZOJ1898 Come On 图上求路径数问题 随机地加入一些“鱼”，它们的变化有周期性，且周期为2,3或4 人 阅读全文
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This article is made by Jason-Cow.Welcome to reprint.But please post the article's address. 莫比乌斯定理（未完待续......）： 形式1： 形式2： 引理: 证明1： 右边=带入左边等式，得 又当且仅当 : 阅读全文
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校内CJOJ2395by Jesse Liu 筛法三合一 Euler、Möbius、Prime函数 基于数论的积性函数 gcd(a,b)=1 则 ƒ(ab)=ƒ(a)ƒ(b) 1 #include <algorithm> 2 #include <iostream> 3 #include <cstri 阅读全文