This article describes how to efficiently count the number of unique values ​​in the bitwise OR operation for all non-empty subarrays in an array. The key idea is to maintain a dynamic hash set and gr

This problem determines whether an array is monotonic (increasing or decreasing). By maintaining two Boolean flags, nonDecreasing and nonIncreasing, the relationship between adjacent elements is check

This problem determines whether an array is monotonic (increasing or decreasing). By maintaining two Boolean flags, nonDecreasing and nonIncreasing, the relationship between adjacent elements is check

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 "()"