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Partition the string into the fewest contiguous substrings such that each substring is "balanced" (every distinct character in the substring appears the same number of…
Companies: Grammarly
Counting · Dynamic Programming · Hash Table · String
Given a list of intervals (endpoints touching allowed), find the minimum number to remove so the remaining intervals are pairwise non-overlapping — equivalently, select the…
Companies: Grammarly, Amazon, Docusign
Array · Dynamic Programming · Greedy · Sorting
Reconstruct a binary tree from a preorder string where each node is represented by its value prefixed with D dashes indicating its depth (root depth…
Companies: Grammarly
Binary Tree · Depth-First Search · String · Tree
Given a sorted array of distinct integers and a target, return the index where the target is found or the index where it should be…
Companies: Grammarly, Bloomberg, Google, Meta
Array · Binary Search
Given a set of weighted intervals, pick at most two non-overlapping events (events are inclusive, so the next must start at least end+1) to maximize…
Companies: Grammarly, Goldman Sachs
Array · Binary Search · Dynamic Programming · Heap (Priority Queue)
Determine whether the string s can be segmented into a sequence of one or more words from wordDict (words may be reused). The core challenge…
Companies: Grammarly, Amazon, Google, Meta +3
Array · Brute-Force Search · Dynamic Programming · Hash Table
Determine whether a target word can be formed by a path of horizontally or vertically adjacent cells in an m×n letter grid without reusing a…
Companies: Grammarly, Amazon, Glean, Google +3
Array · Backtracking · Depth-First Search · Matrix