This problem requires returning the transposed matrix of a given matrix. A transposed matrix is ​​a new matrix obtained by swapping the row and column indices of the original matrix, essentially chang

Article Summary:The task is to find the smallest subtree in a binary tree that contains all deepest nodes. Using a depth-first search (DFS), for each subtree, the maximum depth and the lowest common a

高等数学（第七版）同济大学 习题11-3 （后4题）个人解答

Summary: This problem requires finding the shortest contiguous subarray in an integer array nums with a sum of at least k. The solution efficiently computes prefix sums and uses a monotonic deque to t

This article discusses how to hire K workers at the lowest cost, ensuring wages proportional to work quality and no less than the minimum desired wage. The key idea is to sort workers by their wage/qu

Summary: The problem involves calculating the score of a balanced parentheses string based on specific rules. The score is determined by the depth of nested parentheses: each inner pair "()"

Summary: The problem involves calculating the score of a balanced parentheses string based on specific rules. The score is determined by the depth of nested parentheses: each inner pair "()"

Approach The problem requires finding the minimum number of adjacent swaps needed to transform string s1 into s2 when both strings are anagrams. The key insight is that each swap should aim to correct

This problem requires finding the peak index in a mountain array efficiently. The solution uses binary search to achieve O(log n) time complexity. By comparing middle elements with their neighbors, it

Summary: The problem determines if a given array of card values can be rearranged into groups of consecutive values, each of size groupSize. The solution involves sorting the array and using a greedy