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（LightOJ - 1395）Dangerous Maze (II)（期望DP）

题目链接：A Dangerous Maze (II) - LightOJ 1395 - Virtual Judge (ppsucxtt.cn) 题意：一个迷宫有n扇门，每个门对应一个非零值x，如果x是正的，就会在x分钟后带你逃离迷宫，如果x是负的，就会在（-x）分钟后带你回到原点，你会记录你最后走的k扇门，问你走出迷宫的时间期望。这道题目是之前做过的

[CF1131G]Most Dangerous Shark

壹、题目描述 ¶ 传送门 to Luogu. 有 \(n(n\le 10^7)\) 个骨牌，相邻距离为 \(1\)，对于第 \(i\) 个骨牌，其高度为 \(h_i\)，推倒它的花费为 \(c_i\)，你可以选择将它向左或向右推倒，当第 \(i\) 个骨牌被推倒时，它会以相同方向推倒与其距离小于 \(h_i\) 的骨牌，求推倒所有骨牌的最小花费。

CF1131G Most Dangerous Shark

一、题目点此看题二、解法考虑每个点的推倒状态只有向左倒和向右倒，然后我们又要把所有骨牌推倒，所以设计 \(dp[i]\) 表示推倒前 \(i\) 个骨牌的最小代价，假设我们会处理 \(l[i],r[i]\) 表示向左推倒骨牌 \(i\) 覆盖的左端点，向右推倒骨牌 \(i\) 覆盖的右端点，转移：把 \(i\) 向左

Using more than one index per table is dangerous?

Using more than one index per table is dangerous? 问题 In a former company I worked at, the rule of thumb was that a table should have no more than one index (allowing the odd exception, and certain parent-tables holding references to nearly all other tabl

App权限—normal and dangerous permissions

Determine What Permissions Your App Needs Normal Permissions Every Android app runs in a limited-access sandbox. If an app needs to use resources or information outside of its own sandbox, the app has to request the appropriate permission. You decl

LightOJ - 1027 A Dangerous Maze 概率数学期望

你在起点面对n扇门，每次等概率的选择一扇门，若这扇门是数字，花费Xi直接到达终点否则花费Xi回到起点。这题很有思考价值。设期望时间为E。有E = 1/n * （Xi ） + 1/n * (E + Xi) 最后求解E即可。 ll gcd(ll a, ll b) { return b == 0 ? a : gcd(b, a % b); } int cnt1, cnt2;

G - Most Dangerous Shark dp 单调栈单调队列

题意：一条线段上有n张骨牌(n=1e7), 相邻骨牌距离为1，每张骨牌有其高度和推倒的花费，问最少的花费推倒所有的骨牌。题解：首先用单调栈维护每个位置往左（右）推能推倒的最远的骨牌 dp[i]表示1-i倒下的最小花费转移显然只有两种一种是第i张往左推动另一种是找到往右推动能推倒i

CodeForces 96A Football （C）

题目 Petya loves football very much. One day, as he was watching a football match, he was writing the players’ current positions on a piece of paper. To simplify the situation he depicted it as a string consisting of zeroes and ones. A zero correspond

lightoj 1027 A Dangerous Maze 期望

设答案为r，cnt为x[i] >=0的个数那么r = 1/n * (Σx[i](x[i] >= 0) + ∑(r - x[i])(x[i] < 0)) 然后把r移项到一起解方程，得到r = ∑|x[i]| / cnt，同除gcd。记得特判下x[i]均为负数的情况即可。 1 #include <cstdio> 2 #include <algorithm> 3 using namespace std; 4 int T,cas

ASP.NET 4.0验证请求 A potentially dangerous Request.Form value was detected from the client

原文链接：http://www.cnblogs.com/TSPWater/archive/2012/01/31/2333210.html 在安装了Visual Studio 2010 之后，当页面输入框默认情况下输入“<”或者“>”的时候。按照访问策略，这将导致一些安全问题，诸如：跨站脚本攻击（cross-site scripting attack）。而这

A Dangerous Maze (概率期望)

A Dangerous Maze LightOJ - 1027 You are in a maze; seeing n doors in front of you in beginning. You can choose any door you like. The probability for choosing a door is equal for all doors. If you choose the ith door, it can either take you back to the