Problem Description “Well, it seems the first problem is too easy. I will let you know how foolish you are later.” feng5166 says.

Problem Description Ignatius is poor at math,he falls across a puzzle problem,so he has no choice but to appeal to Eddy. this problem describes that:f(x)=5*x^...

Problem Description In many applications very large integers numbers are required. Some of these applications are using keys for secure transmission of data, ...

Problem Description In most languages, text is written from left to right. However, there are other languages where text is read and written from right to lef...

Problem Description Ignatius likes to write words in reverse way. Given a single line of text which is written by Ignatius, you should reverse all the words a...

Problem Description These days, I am thinking about a question, how can I get a problem as easy as

Problem Description Given a sequence 1,2,3,……N, your job is to calculate all the possible sub-sequences that the sum of the sub-sequence is M.

In many applications very large integers numbers are required. Some of these applications are using keys for secure transmission of data, encryption, etc. In th...

https://leetcode-cn.com/problems/permutation-sequence/

A numeric sequence of ai is ordered if a1 < a2 < … < aN. Let the subsequence of the given numeric sequence (a1, a2, …, aN) be any sequence (ai1, ai2, …, aiK), w...