imsi number

The specific topic is this: Select n numbers from the 1--9, make up the number of n digits that are not duplicated, numbering from small to large, and when you enter any number m, you can find the number corresponding the number. such as n=3,m=213. output: [123 (1), 132 (2), 213 (3), 231 (4), 31

This article mainly introduces PHP's pseudo-random number and real random number details. This article first explains the concepts related to the real random number and pseudo-random number, and gives the comparison using mt_rand () an example code for a function to generate better pseudo-random numbers requires This a

The specific topic is this: Select n numbers from the 1--9, make up the number of n digits that are not duplicated, numbering from small to large, and when you enter any number m, you can find the number corresponding The number. such as n=3,m=213. Output: [123 (1), 132 (2), 213 (3), 231 (4), 312 (5), 321 (6)]--->x=2

The concept of number of CPUs , number of cores,number ofprocessor CPU number The independent central processing Unit, which is represented on the motherboard, is the number of CPU Slot Position cpu cores in each cpu cor

This article mainly introduces how to generate a unique number in PHP. in this article, convert the hexadecimal value to 36 to obtain more than 60 million unique numbers that are not repeated, with the number of digits being 10 digits, if you need a large data number, you can refer to the following, for example, the five-digit license plate

When we want to numbers a large number of data, there is a limit on the number of digits, such as a five-digit license plate number, a ten-digit license number, order serial number, and a short URL, we can use the 36-digit system to calculate non-repeated numbers that match

The questions are as follows: Given an integer array in ascending order, search for index numbers that appear in an array. For example, if the number of search results is 3, 2, 3, 4, and 5, then 1 and 2 are returned. The time complexity must be O (logn ). When you get this question for the first time, you can immediately use a binary search. First, compare the number in the middle and the

[Topic] enter an integer n to calculate the number of occurrences of 1 in the n positive numbers from 1 to n. For example, if the input value is 12 and a number is 1, 10, 11, and 12, there are 5 ones in total, the output value is 5. [Si Lu 1] Almost allAlgorithmThere are intuitive and easy-to-think methods for questions. Of course, the efficiency of such methods is usually not very good, but solving the p

1107 number of lines with slope less than 0 base time limit: 1 seconds space limit: 131072 KB Score: 40 Difficulty: 4-level algorithm There is a C (n,2) line between n points in the two-dimensional plane. The number of lines in this C (n,2) line that have a slope less than 0. A point on a two-dimensional plane, which can be represented as (x, y) according to the corresponding X-Y coordinate.For example: (2,

Maximum number of iis connections and queue length, number of iis and queue length Recently, performance problems have occurred on the servers of the company's project. When the customer asks the question about the maximum number of connections, the question about the excessive iis load is very cute. Then, he checked the relevant information: First, let's take a

JS algorithm set (i)★Recently some friends and I said to JS in some of the algorithm is very confused, know this algorithm is what is going on, but it is not in code to write it, here I share with you the idea of the algorithm to do Narcissus number, and its expansion to the self-power number of the algorithm, I hope to be helpful to everyone.1, verify whether a number