Group For C++/C/Java/Python Students
Update: 8/11/16 created a group on edmodo, join via this link: https://www.edmodo.com/home#/join/2s9zicHello, friends I am a student. And a beginner in c++ programming. Friends i got an idea of...
View ArticleVideo Editorials: *September Challenge*
Hey guys,This is me Rachit Jain. I had made a playlist for the previous August Challenge, which you can see HERE. I was busy with office work recently, hence the delay for the video editorials for the...
View ArticleHow to find XOR of all the elements in given range?
#include <bits/stdc++.h> #define ll long long int using namespace std; ll Xor(ll n) { if(n%4==0) return n; if(n%4==1) return 1; if(n%4==2) return n+1; if(n%4==3) return 0; } int main() { ll t;...
View ArticleWhat is the Problem in this Binary Search Tree code?
include <stdio.h>include <stdlib.h>//Biinary Search Tree typedef struct NODE { int data; struct NODE * lchild, *rchild; }node;node * add(node * root, int n) { node temp, parent, current;...
View ArticleORDERS SPOJ
How to solve this problemhttp://www.spoj.com/problems/ORDERS/ I have seen some solution implementing tree to solve it but not able to understand it please help me out....
View ArticleHow to create a object to call method for interface?
Can you help me to modify this code? I want my code to display the addition method and subtraction in two classes also. interface TypeOfNumber { int a=10; int b=6;void addition(int a,int b);void...
View Articlereduce loop
Can any one tell me how we can reduce loops except using recurssion .. if I'm getting O(n^3) how can we reduce it. In C,C++,JAVA
View ArticleWhat are the "must known" algorithms for online programming contests?
Hello all, I've been practicing at Codechef for a while and now I'm gradually moving toward medium/hard problems. However many algorithms at these levels are very difficult to predict, and I was always...
View Articlehelp needed in ASIA AMRITA ICPC REGIONAL 2016 on problem influence on social...
how to prove that the Every supporter is of the form p^{q-1} , where p , q are primes and q is odd. problem link https://www.codechef.com/problems/AMR16C
View ArticleFIRESC - Editorial
PROBLEM LINKSPracticeContestDIFFICULTYSIMPLEPREREQUISITESGraph Theory, Union Find, Depth First SearchPROBLEMAn Office has several people on which a relationship of being mutual friends is defined. Two...
View ArticleHelp in QUERGRID problem
I have been figuring out the solution of the QUERGRID problem of the codechef september challenge 2017. I have gone through the editorial many a times but i was unable to figure out a question. A...
View ArticleBuying Sweets
Sachin likes sweets a lot. So, he goes to a market of sweets. There is a row of sweet stalls. Every sweet stall has different sweets. To save some time, he decided to buy sweets from contiguous stalls....
View ArticleProblem in obtaining the right judgement
I have tried solving the "Video Game" problem(ZCO14001) ad i am pretty sure the answer is correct, the subtasks are also showing right results. But when i am submitting they are saying that the answer...
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CHEFTOWN - Editorial
PROBLEM LINK:PracticeContestDIFFICULTYEASYPREREQUISITESData Structure, Double Ended QueuePROBLEMGiven a permutation of numbers from 1 to N, how many segments of length W exist such thatSuppose the...
View ArticleHow post increment and pre increment are used in GCC Compiler ?
include<stdio.h>int main(){int x=12;printf("%d %d",x++,x++);return 0;}
View ArticleWhy does judge has so many issues?
During any competition may it be codechef, codeforces or any other platform, whenever I use codechef's IDE, most of the times I get a reply "Judge has some issues" and the frustrating part it that it...
View ArticleEqual sum partition
Equal partition: Given a set A of 40 real numbers, find out if there is any way to split A in two sets such that the sums of their elements are equal. (Hint: complexity O(2n/2))How do I solve this...
View Articleoutput not correct
Can anybody please explain me where I went wrong .My output is showing 0 on online compiler, but is working well on codeblocks. link to the question is:https://www.codechef.com/problems/SPREAD ans is...
View ArticleANDROUND question
problem-http://www.spoj.com/problems/ANDROUND/ Can someone please help provide a detailed solution on the above problem, am not able to understand why and how to apply segment tree in the given...
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