Robina Li

LeetCode wants to give one of its best employees the option to travel among n cities to collect algorithm problems. But all work and no play makes Jack a dull...

Given a rows x cols screen and a sentence represented as a list of strings, return the number of times the given sentence can be fitted on the screen.

The next greater element of some element x in an array is the first greater element that is to the right of x in the same array.

Given a sorted integer array nums and three integers a, b, and c, apply a quadratic function f(x) = ax² + bx + c to each element nums[i] in the...

A Range Module is a module that tracks ranges of numbers. Design a data structure to track the ranges represented as half-open intervals [left, right).

A word square is a sequence of words where the k-th row and k-th column read the same string.

Given the root of a binary search tree and a target value, return the value in the BST that is closest to the target. If there are multiple answers, print...

In this problem, a rooted tree is a directed graph such that there is exactly one node (the root) for which all other nodes are descendants of this node, plus...

Given the root of a binary search tree (BST) and a node p in it, return the in-order successor of that node in the BST. If the given node has...

Given a binary array nums, return the maximum number of consecutive 1’s in the array if you can flip at most one 0.