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Resource constraints Time limit: 1.0s   Memory limit: 256.0MB Problem description zsyzgu is A weak dish. Nevertheless, he participated in the agent series. The problem of the agent series is simplified as follows. There is A monkey and some mining points. They know their coordinates on the plane. The monkey has to pass through these mi ...

DFS pruning and searching The first thing to ensure in designing DFS search is to design a reasonable search order that can cover all States. However, the number of DFS search States increases exponentially, and some of these states are 'useless'. Therefore, we need to reduce the search states through pruning strategy to improve the efficiency ...

preface Customize the regular expression rules, and then complete the implementation of the matching algorithm. 1, Title Please implement a function to match regular expressions containing '.' and '*'. The character '.' in the mode represents any character, and '/ *' represents that the character before it can appear any time (in ...

1.Hash related When using HashMap, why can you find the corresponding value according to map.get(key) with time complexity O(1)? Because the physical structure uses a hash table Calculate the array position where the Entry should be stored according to a special algorithm. If the positions are the same, there are various methods to solve the ...

preface Tip: the following is the main content of this article. The following cases can be used for reference I P1683 getting started Title Description Not everyone can enter Taohua island. Pharmacist Huang hates people as stupid as Guo Jing. Therefore, he built a path at the only entrance to Taohua Island, which was all paved with ...

Introduction to graph theory Definition of graph Graph G =(V,E),V is a finite non empty set of vertices, and E is an edge set. V(G) and E(G) represent the vertex set and edge set of G, respectively. Where E(G) can be an empty set. If E(G) is a set of directed edges, then G is a directed graph, otherwise it is an undirected graph. < x, ...