This function checks whether a given string is valid according to the rules defined above. A valid string must contain matching parentheses, with the left parentheses coming before the right parentheses, and '*' characters representing either a left or right parentheses or an empty string.

198

Oct 20
The problem is to find the index of a target value T in a sorted array A. If T is not present in A, the function should return -1.

216

Oct 20
The problem is asking for the sum of all integers in a list. An example input would be [1, 2, 3, 4, 5], and the expected output would be 15.

203

Oct 20
To remove all duplicates from a linked list, we can iterate through the list, keeping track of which values have been seen already. If we encounter a value that we have seen before , we can remove it from the list. Otherwise, we add it to our set of seen values and continue iterating.

235

Oct 20
This function takes in an array of integers and returns the sum of all the elements in the array.

226

Oct 18
Find the maximum sum of a contiguous subarray of length k in an array of n integers.

176

Oct 17
To delete the head node of a singly linked list, simply write a function that takes in the linked list and removes the first node.

179

Oct 12
Given a list of airline flights with their departure and arrival times, find the shortest path from one city to another using a graph algorithm.

219

Oct 12