Practice problems across 75+ categories
Practice problems frequently asked at Prefix Sum • 208 problems | 18 Easy | 128 Medium | 61 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 151 | Number of Same-End Substrings | Medium | ArrayHash TableString |
| 152 | Number of Sub-arrays With Odd Sum | Medium | ArrayMathDynamic Programming |
| 153 | Number of Submatrices That Sum to Target | Hard | ArrayHash TableMatrix |
| 154 | Number of Substrings With Fixed Ratio | Medium | Hash TableMathString |
| 155 | Number of Ways of Cutting a Pizza | Hard | ArrayDynamic ProgrammingMemoization |
| 156 | Number of Ways to Select Buildings | Medium | StringDynamic ProgrammingPrefix Sum |
| 157 | Number of Ways to Split Array | Medium | ArrayPrefix Sum |
| 158 | Number of Wonderful Substrings | Medium | Hash TableStringBit Manipulation |
| 159 | Palindrome Rearrangement Queries | Hard | Hash TableStringPrefix Sum |
| 160 | Partition Array to Minimize XOR | Medium | ArrayDynamic ProgrammingBit Manipulation |
| 161 | Plates Between Candles | Medium | ArrayStringBinary Search |
| 162 | Points That Intersect With Cars | Easy | ArrayHash TablePrefix Sum |
| 163 | Power of Heroes | Hard | ArrayMathDynamic Programming |
| 164 | Product of Array Except Self | Medium | ArrayPrefix Sum |
| 165 | Product of the Last K Numbers | Medium | ArrayMathDesign |
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