人生如梦，梦醒时悲欢离合

This problem doesn’t have a story. You just have to write a calculator which could perform simple binary operations. You will be given an expression and your program should calculate it’s result. Expr...

Time Limit: 2 Seconds      Memory Limit: 65536 KB...<Saika> I want to get some water from this strange lake. I have a bottle.<Keeper> OK.<Saika> Then I want to go forward to look int...

Time Limit: 1 Second      Memory Limit: 65536 KBIf we represent a date in the format YYYY-MM-DD (for example, 2017-04-09), do you know how many 9s will appear in all the dates between Y1-M1-D1 and Y2-...

Time Limit: 1 Second      Memory Limit: 65536 KBA seven segment display, or seven segment indicator, is a form of electronic display device for displaying decimal numerals that is an alternative to th...

The successor to a string can be calculated by applying the following rules: Ignore the nonalphanumerics unless there are no alphanumerics, in this case, increase the rightmost character in the st

2048 is a single-player puzzle game created by Gabriele Cirulli1. It is played on a 4×44×4 grid that contains integers ≥2≥2 that are powers of 2. The player can use a keyboard arrow key (left/up

You have a simple system in which you want to have a search function. You decided to implement it for searching email addresses. There is a bunch of email addresses in your program. User enters an em...

Ming is going to travel for n days and the date of these days can be represented by n integers: 0, 1, 2, …, n-1. He plans to spend m consecutive days（2 ≤ m ≤ n）in Beijing. During these m days, he inte...

In computability theory, the halting problem is the problem of determining, from a description of an arbitrary computer program, whether the program will finish running (i.e., halt) or continue to run...