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B. Bit Flipping time limit per test 1 second memory limit per test 256 megabytes You are given a binary string of length n. You have exactly k moves. In one move, you must select a single bit. The state of all bits except that bit will get flipped (0 becom

A. Red Versus Blue（构造题） time limit per test 1 second memory limit per test 256 megabytes Team Red and Team Blue competed in a competitive FPS. Their match was streamed around the world. They played a series of n matches. In the end, it turned out Team Red

C. Weird Sum time limit per test 2 seconds memory limit per test 256 megabytes Egor has a table of size $ n \times m$, with lines numbered from 111 to nnn and columns numbered from $1 $to mmm. Each cell has a color that can be presented as an integer from$

B. Game of Ball Passing time limit per test 1 second memory limit per test 256 megabytes Daniel is watching a football team playing a game during their training session. They want to improve their passing skills during that session. The game involves n pla

C. Madoka and Childish Pranks time limit per test 1 second memory limit per test 256 megabytes Madoka as a child was an extremely capricious girl, and one of her favorite pranks was drawing on her wall. According to Madoka’s memories, the wall was a table

B. Madoka nd the Elegant Gift time limit per test 1 second memory limit per test 256 megabytes Madoka’s father just reached 11 million subscribers on Mathub! So the website decided to send him a personalized award — The Mathhub’s Bit Button! The Bit Button

B. Marin and Anti-coprime Permutation time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Marin wants you to count number of permutations that are beautiful. A beautiful permutation of length n is a

A. Marin and Photoshoot time limit per test 1 second memory limit per test 256 megabytes Today, Marin is at a cosplay exhibition and is preparing for a group photoshoot! For the group picture, the cosplayers form a horizontal line. A group picture is con