ibeacon distance

Link: acm. timus. ruproblem. aspx? The topic space1num1348 is to find the shortest distance and longest distance from a point to a line segment .. It is easier to get the longest distance, that is, to find the long distance between the two endpoints of a point and a line segment is ans. The shortest

Management Distance definition Management Distance in a route is a method to sort the reliability of the route selection information. The management distance is a certificate between 0 and, and the smaller the value, the higher the credibility. Although the management distance can be set to 1-9, they are reserved for i

, better reset effect, low power consumption, fast. The buzzer uses the passive buzzer, compared with the active buzzer, although the difficulty becomes big, must use the square wave of the 2k~5k to drive it, but the sound frequency is controllable, and the price is more inexpensive. Lcd1602 Industrial Character LCD can display 16x02 32 characters at the same time, compared with other liquid crystal displays, the display of letters and numbers is more convenient, simple control and low cost. Pre

Recently used in accordance with the latitude and longitude calculation of the Earth's surface two distance between the formula, and then use JS to achieve a bit. There are probably two ways to calculate the distance between two points on the Earth's surface. The first is the default Earth is a smooth spherical surface, and then calculate the distance between any

Make sure the K division reaches the minimum squared error. It is suitable for the discovery of convex shape clusters, the difference between clusters and clusters is obvious, and the cluster size is similar. Advantages The algorithm is fast, simple, efficient and scalable for large data sets, and the time complexity is O (n*k*t), where T is the number of iterations, is close to linearity, and is suitable for mining large data sets. Disadvantages The selection of K value is difficult to estimate

Distance Transformation for image processing Overview Distance transformation is a common means of processing and operating binary images. It is often used in skeleton extraction and image narrowing. Distance The conversion result is a grayscale image similar to the input image, but the grayscale value only appears in the foreground area. And The larger the pixel

face is the local meridian plane. The longitude of a point is the angle between the meridian plane and the Prime Meridian plane. Measured on the equator, from the Prime Meridian plane as the starting point, respectively east to West Measurement, the east measure value is called the longitude degree, the westward measure is called the longitude degree. Thus, the longitude of the ground is the direction and angular distance of the prime meridian. The P

How are these longitude determined? The earth is constantly spinning around its axis (the earth's axis is a center of the north-south poles and the Earth.Imaginary line), in the Earth's waist draw a large circle perpendicular to the axis, so that each point on the circle and the North and south poles of the same distance, this circleIt is called "the equator". At the north and south sides of the equator, many circles parallel to the equator are drawn,

Another solution of "the beauty of programming: finding the maximum distance of a node in a binary tree" Yesterday I spent one night writing a book review on Douban for the beauty of programming, late book reviews and thoughts-for friends who love programming. Book reviews will not be reposted here. Instead, we will introduce another solution to one of the problems in this book. This solution is short and easy to read and reduces the space complexity,

The concept of wireless router transmission distance is relatively vague, although in the wireless router's product specifications are generally marked with wireless router wireless network signal effective transmission distance of 100-300 meters, of which the different transmit power of the wireless router transmission distance has a certain gap. So many friends

/* Question:There is a string X, which is an extension string of X after inserting any number of spaces in the header and tail of X,If the string X is "abcbcd", the strings "abcb □cd", "□a □bcbcd □" and" abcb □cd □" are all extension strings of X,Here "□" represents space characters.If A1 is an extension string of string A, B1 is an extension string of string B, and A1 and B1 have the same length,Then I will define the distance between the string A1 a