I am currently stuck around 1500-1600 and it's time for me to start the grind to reach CM. Here's how I'm planning to do it strategically and consistently. Please have a look, maybe it can motivate someone else to reach their next rank. Any support would mean so much to me. and I'm looking for suggestions from anyone who has already achieved this.

Posting Intuition on YouTube would improve my insight and may help someone else who is also stuck there. Let me know what you think about it.

here is the link for the same.

You are given an array a of length n and q queries... A query is in the form [l,r,x].. First, you need to replace each a[i] with a[i]^x for each i from l to r and then answer for the query will be bitwise OR of all a[i] for each i from l to r... here the changes of each query will permanently reflect in the array...and every time we process on the updated array... constraints: N and q <=10^5 A[i] and x <=10^9 L<=r<=N

suggest some of the possible way to approach this problem and some of intuition for in general solving this type of range update questions.... i think...some kind of segment tree or BIT solution must be there...

we have given with an array of coordinate pairs in the form of (x,y) and an integer k, we have to find the number of pairs such that ((x1^x2)+(y1^y2))=k where (x1,y1) is first pair and (x2,y2) is second pair... also i<j, assume the length of the input array to be 10^5 and k can go up to 100..

i know it's some kind of map question where we have separate the relationship in form of x1,y1 and x2,y2 independently...but not able to come up with such relationship... can someone help me with some good approaches and also the intuition behind it... thank you!!

we are given with an array of n integers n<=10^5 , we need to answer q queries q<=10^5 , in each query we are given with l,r and an integer x, for each query we need to answer the summation of |a[i]-x| for all i>=l && i<=r (summation of absolute difference of each number with x in range l and r)..as constraints are big we need to solve each query in less than n... Can anyone suggest some approach with some thought process....

can anyone explain this why https://mirror.codeforces.com/contest/18/submission/172558206 this solution gets accepted while https://mirror.codeforces.com/contest/18/submission/172557506 this is giving wrong answer for problem https://mirror.codeforces.com/contest/18/problem/C

Isn't both the same thing??

can anyone suggest some good resource to learn the basic concept and implementation of sparse table?