## Monthly Archives: May 2022

### Educational Codeforces Round 129 – Problem C

You are given two arrays a and b, both consisting of n integers. In one move, you can choose two indices i and j (1≤i,j≤n; i≠j) and swap ai with aj and bi with bj. You have to perform the swap in both arrays. You are allowed to perform at most 104 moves (possibly, zero)….

### Educational Codeforces Round 129 – Problem B

Monocarp has just learned a new card trick, and can’t wait to present it to you. He shows you the entire deck of n cards. You see that the values of cards from the topmost to the bottommost are integers a1,a2,…,an, and all values are different. Then he asks you to shuffle the deck m…

### Educational Codeforces Round 129 – Problem A

Alice and Bob play a game. Alice has n cards, the i-th of them has the integer ai written on it. Bob has m cards, the j-th of them has the integer bj written on it. On the first turn of the game, the first player chooses one of his/her cards and puts it on…

### Codeforces Round #793 – Problem C

C. LIS or Reverse LIS? time limit per test: 1 second memory limit per test: 256 megabytes input: standard input output: standard output You are given an array a of n positive integers. Let LIS(a) denote the length of longest strictly increasing subsequence of a. For example, LIS([2,1,1,3]) = 2. LIS([3,5,10,20]) = 4. LIS([3,1,2,4]) =…

### Codeforces Round #793 – Problem B

B. AND Sorting time limit per test: 1 second memory limit per test: 256 megabytes input: standard input output: standard output You are given a permutation p of integers from 0 to n−1 (each of them occurs exactly once). Initially, the permutation is not sorted (that is, pi>pi+1 for at least one 1≤i≤n−1). The permutation…

### Codeforces Round #793 – Problem A

A. Palindromic Indices time limit per test: 1 second memory limit per test: 256 megabytes input: standard input output: standard output You are given a palindromic string s of length n. You have to count the number of indices i (1≤i≤n) such that the string after removing si from s still remains a palindrome. For…