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n different online courses numbered from
n. You are given an array
courses [i] = [durationi, lastDayi] indicate that the
ith course should be taken continuously for
durationi days and must be finished before or on
You will start on the
1st day and you cannot take two or more courses simultaneously.
Return the maximum number of courses that you can take.
Design a special dictionary which has some words and allows you to search the words in it by a prefix and a suffix.
WordFilter (string  words)Initializes the object with the
wordsin the dictionary.
f (string prefix, string suffix)Returns the index of the word in the dictionary which has the prefix
prefixand the suffix
suffix. If there is more than one valid index, return the largest of them. If there is no such word in the dictionary, return
Given three integers
bound, return a list of all the powerful integers that have a value less than or equal to
An integer is powerful if it can be represented as
xi + yj for some integers
i >= 0 and
j >= 0.
You may return the answer in any order. In your answer, each value should occur at most once.
A robot is located at the top-left corner of a
m x n grid (marked ‘Start’ in the diagram below).
The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the grid (marked ‘Finish’ in the diagram below).
Now consider if some obstacles are added to the grids. How many unique paths would there be?
An obstacle and space is marked as
0 respectively in the grid.