You know I'm too newbie but why my rating doesn't change

Link ->http://mirror.codeforces.com/contest/431/submission/20762830 I don't know why it is wrong maybe the way I use mod or my states aren't ok.

Hey what's up? Can u help me to understand this one http://mirror.codeforces.com/contest/474/problem/D I don't understand the ouput. it says eat only white flowers of size k. I think it means consecutive white flowers.

Hi all. Could some please make me understand what it is with an example? I'll appreciate it. DO you have some problems to apply it?

in my local PC I ouput the correct answer but in CF does not. Link -> http://mirror.codeforces.com/contest/585/submission/13721320

Hi everyone. When I try to solve a C or D problem. it turn out to be difficult for me I dont know what to do. I spend almost all my time in those problems but without success.

I'm really bad at math. Do you know some textbooks that can help me in that way? Can you give me some advices, which math books are usefull for programming ?

I am learning DP and I am a litle frustrated. I am stucked in this problem http://mirror.codeforces.com/problemset/problem/466/C I drew some pictures to find out some states this is the image http://i61.tinypic.com/de4rpe.jpg theres is a pattern in these pictures to get this formula n = n — 2 numberOfTotalCombinations = n * (n-1) / 2 the worst case(5 * 10^5) would be = 124999750000 and it will not pass. My questions Should I consider all the combinations? How to define my states? How I need to construct a DP solution based on the previous states? Thansk in advance and sorry for my bad english

Hi everyone. sometimes when I am stresed I can't think of ideas and it affects my progress What do you do to manage the stress and at the same time improving your programming skills?

I've never hacked a solution before. Could someone leave a link to learn how to hack? About the title In general. I mean how to generate counter-examples? what is the best way?

Like books, links, blogs, videos.

Are there some contests for beginners? I'd like to participate.

Are there some contests for beginners? I'd like to participate.