How to Solve Course Schedule I V Problem
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Course Schedule IV
There are a total of numCourses courses you have to take, labeled from 0 to numCourses - 1. You are given an array prerequisites where prerequisites[i] = [ai, bi] indicates that you must take course a...
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Understanding the Course Schedule I V Problem
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Problem Statement
There are a total of numCourses courses you have to take, labeled from 0 to numCourses - 1. You are given an array prerequisites where prerequisites[i] = [ai, bi] indicates that you must take course ai first if you want to take course bi. For example, the pair [0, 1] indicates that you have to take course 0 before you can take course 1. Prerequisites can also be indirect. If course a is a prerequisite of course b, and course b is a prerequisite of course c, then course a is a prerequisite of course c. You are also given an array queries where queries[j] = [uj, vj]. For the jth query, you should answer whether course uj is a prerequisite of course vj or not. Return a boolean array answer, where answer[j] is the answer to the jth query.
Course Schedule IV
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Examples
numCourses = 2, prerequisites = [[1,0]], queries = [[0,1],[1,0]][false,true]The pair [1, 0] indicates that you have to take course 1 before you can take course 0. Course 0 is not a prerequisite of course 1, but the opposite is true.
numCourses = 2, prerequisites = [], queries = [[1,0],[0,1]][false,false]There are no prerequisites, and each course is independent.
numCourses = 3, prerequisites = [[1,2],[1,0],[2,0]], queries = [[1,0],[1,2]][true,true]Constraints
2 <= numCourses <= 1000 <= prerequisites.length <= (numCourses * (numCourses - 1) / 2)prerequisites[i].length == 20 <= ai, bi <= numCourses - 1ai != biAll the pairs [ai, bi] are unique.The prerequisites graph has no cycles.1 <= queries.length <= 1040 <= ui, vi <= numCourses - 1ui != viHow Interview Coder Helps with Leetcode Problems
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