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A

3120. Count the Number of Special Characters I

Easy

#String#Hashing#Greedy Video Code

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B

3121. Count the Number of Special Characters II

Medium

#String#Greedy#Hashing Video Code

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C

3122. Minimum Number of Operations to Satisfy Conditions

Medium

#Matrix#Dynamic Programming Video Code

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D

3123. Find Edges in Shortest Paths

Hard

#Graph#Depth-First Search#Shortest Path Video Code

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