Skip to main content

Complete the Tour

Given a circular road and a set of petrol pumps located at distances d1 d2 ... dn away from each other and supplying p1 p2 p3 ... pn amounts of fuel and your vehicle has a mileage of 1km/l. Determine the feasibility of going around the path starting with zero fuel. Find a point from which you can start and complete the cycle given that you have zero initial fuel.

This will be O(n) algorithm.

Start from a random node say i...check till the last node it reach.
Two case:
1: Either it reach to last node. And current node i is result.
2. It stopped at node j.
Then start from node j+1. to find where we can reach all the node by
above algorithm.
No Node from i to j can complete the traversal, because each node will start with 0 petrol. While traversing from i we always reached that node >= 0. So that condition is already checked.

Labels

Labels:

Comments

Post a Comment

Popular posts from this blog

Car Parking Problem

There is n parking slots and n-1 car already parked. Lets say car parked with initial arrangement and we want to make the car to be parked to some other arrangement. Lets say n = 5, inital = free, 3, 4, 1, 2 desired = 1, free, 2, 4 ,3 Give an algorithm with minimum steps needed to get desired arrangement. Told by one of my friend and after a lot of search i really got a nice solution. I will post solution in comment part
3 comments
Read more

JAVA CLASSLOADER- Types, usages.

JVM loads library and classes dynamically only. Its on demand only. A Class will be loaded only when needed and only once. There can be system supported class loader and user supplied class loader. When JVM starts it loads three type of class loader 1. Bootstrap loader - When system boots. Loads from jre_home/lib/ 2. External class loader - Loads from jre_home/lib/ext. 3. System Class loader - Loads classes from system property CLASSPATH. Besides this user can provide their own class loader which is pretty easy to implement in Java. User supplied loader will work in conjunction with other loader i.e. system loader too. Some of the examples are: 1. Load library at runtime from http resources. Example scripting classes, bean classes. 2. Can load encrypted class files with new class loader. 3. Modify the byte code. Application Container loads classes from deployed WAR or EAR files using a tree of class loaders.
Post a Comment
Read more

Permutations Sum(xi)

You have given "k" dice. How many way you can get a sum "S" and yes you have to throw all the dice. Write program for this. Its same permutations program...but we have to try with all the six S(1,2,3,4,5,6) possibilities for a dice. Exit condition will be If all the dice run out. SumP(dice,sum) = SumP(dice-1,sum-i)+i (from S).
1 comment
Read more