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A3 - The Guessing Game?

does anyone have any DEEPER notion about A3 - The Guessing Game: http://www.codechef.com/problems/A3 approach? thanx beforehand.

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subset sum

Given a set of n numbers ai sum up to M, and any K ≤ M, whether there is a subset of the numbers such that they sum up to (hit)??can any one plz explain this code??? and what r the changes required to...

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Fast Multiplication - explanation

I will try to explain the working of the fast multiplication function in brief.If we want to do an operation like 10^18 * 10^18 % MOD, where MOD is also of the order of 10^18, direct multiplication...

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ATM need help

#include < stdio.h > void main () { int w; float b; scanf("%d %f",&w,&b); if ((w%5==0)&&((b-0.5)>w)) printf("%.2f",(b-0.5-w)); else printf("%.2f",b); } whats wrong in this?

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getting sigsegv error LEBOMBS

i'm getting sigsegv error(runtime error) i checked the guidelines .to my knowledge i followed them.please help in finding the error .thanks in advance.question linkmy solution

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LUCKY5 - Editorial

PROBLEM LINKSPracticeContestDIFFICULTYEASYEXPLANATIONIn this problem the only thing you should notice is that the only operation that you need to use is the changing of digits.Indeed, adding leading...

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Binary tree structure in this case.

Imagine a binary tree lying on the floor with nodes as balls and edges as threads, you are given a pointer to a node. When you pick the tree from that node up what will be the structure of the tree....

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Fastest read / write in java

I am using simple bufferreader but it is slow enough and due to this in some program i got time limit exceed problem . So guys tell me about fastest read and write code for java program.

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MTRICK Problem

http://www.codechef.com/viewsolution/3207227My solution was BIT. But It's get's many time. I think my solution is better than tester solution.How i can optimism time. Any suggestion About my solution.

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Application of breadth first search

I am trying to solve this question: http://www.spoj.com/problems/FINDPATH/ Don't know where it's going wrong. Firstly i am ignoring all the a[i] which are not divisors of destination, i.e., N I am...

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Codechef Rating System

Can anybody explain me how exactly the rating of any user is calculated ?I did't get it from this link also http://blog.codechef.com/2010/12/27/a-surprise-in-store-this-new-year/Please Explain us with...

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LAPIN - Editorial

Problem Link:PracticeContestDifficulty:CakewalkPre-requisites:ad-hocProblem:Given a string S, if we split it in the middle (if S has an odd number of characters, disregard the middle character), then...

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NZEC in Funny Marble

I was solving the funny marble problem of december/13 long contest problem. I have implemented segment tree , but getting NZEC error in code. Plz help !import java.io.*;class funny{public static void...

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Merciless Chef Question: O((q+n)logn) solution is giving TLE

I had submitted the solution for this question (Merciless chef) but it is giving me TLE. I have solved it by first traversing the tree in preorder and obtaining the start and end index of inferior...

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How did you discover Sperner's Theorem for SPOONS?

http://www.codechef.com/SEPT13/problems/SPOONS1) Is Sperner's Theorem a common theorem?2) If it isn't, how did you discover it after reading the question? what were the clues?

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NZEC in java but not in C++

The code in java got NZEC but the same code with same logic in C++ got Accepted . Can you tell me why ?Link to the problem http://www.spoj.com/problems/BYTESM2/C++...

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Knapsack Problems?

What are your favourite knapsack problems? Please link them in the answer. I just learnt the algo and would like to get proficient in it. Thanks :D

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improving program execution time

do recursive programs are less time taking than iterative ones??

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A3 - "The Guessing Game" Editorial / Explanation

does anyone have any DEEPER notion about A3 - The Guessing Game: http://www.codechef.com/problems/A3 approach? thanx beforehand.edit: pls look below for explanation. and pls show your gratitude by...

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Java version (switch)

Hello, I posted my submit to http://www.codechef.com/problems/A3/. It works locally, but on this site I have compilation errors:Main.java:75: incompatible types found : java.lang.String required: int...

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