Pattern

Prefix Sum + Hash Map

3 problems in the roadmap use this pattern.

• Subarray Sum Equals K Medium

  in Arrays, Strings & Hashing

  Reported at: MetaAmazonGoogle+10
• Continuous Subarray Sum Medium

  in Arrays, Strings & Hashing

  Reported at: MetaAmazonGoogle+3
• Contiguous Array Medium

  in Arrays, Strings & Hashing

  Reported at: AmazonMetaApple+1