Ref: http://blog.csdn.net/u013534498/article/details/51399035 如何在Python中实现这五类强大的概率分布 考虑下在mgrid上画二维概率分布. 日后整理. 首先说明一下这里的三个变量分别是k(x轴).b(y轴)以及ErrorArray(z轴). 这次也不让Err=∑{i=1~n}([yi-(k*xi+b)] ^2)了,来个简单的吧,假设f(k,b)=3k^2+2b+1,k轴范围为1~3,b轴范围为4~6: [step1:k扩展](朝…

题意:有一个从根节点\(BFS\)得来的序列(每次\(bfs\)子节点的时候保证是升序放入队列的),现在让你还原树(没必要和之前相同),问能构造出的最小的树的深度. 题解:不看根节点,我们从第二个位置开始,如果某一段元素升序,那么就让他们变为上一层某个结点的儿子,否则,如果上一层还有另外的父节点的话,就作为它的子儿子,如果没有父亲结点可以连的话,就只能去下一层了,具体实现的话,我们可以统计每层结点的个数,如果下一层出现了降序的情况,就减去之前统计的个数,不断往复即可. 代码: int t; in…

Mike and Feet Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 548D Appoint description:  Description Mike is the president of country What-The-Fatherland. There are n bears living in thi…

Codeforces Round #262 (Div. 2) 1003 C. Present time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Little beaver is a beginner programmer, so informatics is his favorite subject. Soon his info…

B. Vanya and Food Processor 题目链接:http://codeforces.com/contest/677/problem/B Vanya smashes potato in a vertical food processor. At each moment of time the height of the potato in the processor doesn't exceed h and the processor smashes k centimeters…

A. Vanya and Fence 题目连接:http://codeforces.com/contest/677/problem/A Vanya and his friends are walking along the fence of height h and they do not want the guard to notice them. In order to achieve this the height of each of the friends should not exc…

B. Pyramid of Glasses 题目链接:http://codeforces.com/contest/676/problem/B Mary has just graduated from one well-known University and is now attending celebration party. Students like to dream of a beautiful life, so they used champagne glasses to constr…

C. Drazil and Park 题目连接: http://codeforces.com/contest/516/problem/C Description Drazil is a monkey. He lives in a circular park. There are n trees around the park. The distance between the i-th tree and (i + 1)-st trees is di, the distance between t…

[codeforces 241]C. Mirror Box 试题描述 Mirror Box is a name of a popular game in the Iranian National Amusement Park (INAP). There is a wooden box, 105 cm long and 100cm high in this game. Some parts of the box's ceiling and floor are covered by mirrors.…

MUH and House of Cards Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 471C Description Polar bears Menshykov and Uslada from the zoo of St. Petersburg and elephant Horace from the zoo o…