Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3136 | Sum of Good Subsequences | Hard | ArrayHash TableDynamic Programming |
| 3137 | Sum of Imbalance Numbers of All Subarrays | Hard | ArrayHash TableEnumeration |
| 3138 | Sum of k-Mirror Numbers | Hard | MathEnumeration |
| 3139 | Sum of K Subarrays With Length at Least M | Medium | ArrayDynamic ProgrammingPrefix Sum |
| 3140 | Sum of Largest Prime Substrings | Medium | Hash TableMathString |
| 3141 | Sum of Left Leaves | Easy | TreeDepth-First SearchBreadth-First Search |
| 3142 | Sum of Matrix After Queries | Medium | ArrayHash Table |
| 3143 | Sum of Mutated Array Closest to Target | Medium | ArrayBinary SearchSorting |
| 3144 | Sum of Nodes with Even-Valued Grandparent | Medium | TreeDepth-First SearchBreadth-First Search |
| 3145 | Sum of Number and Its Reverse | Medium | MathEnumeration |
| 3146 | Sum of Numbers With Units Digit K | Medium | MathDynamic ProgrammingGreedy |
| 3147 | Sum of Prefix Scores of Strings | Hard | ArrayStringTrie |
| 3148 | Sum of Remoteness of All Cells | Medium | ArrayHash TableDepth-First Search |
| 3149 | Sum of Root To Leaf Binary Numbers | Easy | TreeDepth-First SearchBinary Tree |
| 3150 | Sum of Scores of Built Strings | Hard | StringBinary SearchRolling Hash |
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