Programmer Help

A - AB Balance meaning of the title Give a string \ (s \) only composed of characters \ (a \) and \ (b \), and find the least modification to make the occurrence times of \ (ab \) in \ (s \) equal to that of \ (ba \). thinking \In (s \), both \ (ab \) and \ (ba \) only appear between consecutive segments and appear alternately, so the maximum d ...

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Codeforces Round #744 (Div. 3) A. Casimir's String Solitaire meaning of the title Give A string consisting only of characters' A ',' B 'and' C '. You can eliminate one' A 'and one' B 'at A time, or one' B 'and one' C 'at the same time. Ask whether all characters can be eliminated in the end. thinking It can be completely eliminated as long ...

A. Casimir's String Solitaire meaning of the title Give you a string. You can delete AB or BC. Ask if you can delete the string and make it empty. Problem solving ideas Check in, judge c n t ...

Today is 2021.9.23, brushing two 1400 in the afternoon, div2 in the evening, and one after that. 1348.B. Phoenix and Beauty (construction) General idea: Construct a sequence such that the elements of a subsequence of length k in the sequence always sum to m. Reflection: If the sum of all the elements of a subsequence with length k in the ...

A. Median Maximization The simple greedy construction question is intended to find the maximum median. If all the numbers in the known sequence are non negative, we can make all the numbers before the median zero, and then the median can get the maximum total divided by the remaining numbers and rounded down code #include <bits/stdc++.h&gt ...

E. Buds Re-hanging Topic: Given a multifork tree, a node is defined as a "tree bud". The condition is: Not root nodeContains at least one child nodeAll child nodes are leaf nodes. Now you can do one thing: graft the bud node and all its children onto another node. Question: If you can do any of the above operations, what is the m ...