Hello!

Problems:
https://codeforces.com/problemset/problem/997/C
https://codeforces.com/contest/958/problem/C3
http://community.topcoder.com/stat?c=problem_statement&pm=14909

A nice problem to try with:
http://acm.timus.ru/problem.aspx?space=1&num=1268

Have questions? Ask them here.

Hello!

Today's problems:
https://arc086.contest.atcoder.jp/tasks/arc086_d
https://szkopul.edu.pl/problemset/problem/jd9o4lcV64v_ec432zTSoqh8/site/?key=statement
http://acm.timus.ru/problem.aspx?space=1&num=1976 AC code: https://ideone.com/DcnV3b
http://codeforces.com/contest/781/problem/D

Binary search using BIT: https://codeforces.com/blog/entry/61364
Ordered set in c++: https://codeforces.com/blog/entry/11080

Any questions are welcomed.

Hello!

Problems we solved today:
https://beta.atcoder.jp/contests/arc091/tasks/arc091_d
http://codeforces.com/problemset/gymProblem/100733/F
http://codeforces.com/contest/819/problem/D

Feel free to ask any questions.

Hello!

Here are the list of problems we solved today:
http://codeforces.com/problemset/problem/484/C
https://www.codechef.com/problems/BLACKCOM
http://codeforces.com/contest/1025/problem/F
http://codeforces.com/contest/840/problem/C

Feel free to ask any questions here.
AC code for first problem.
AC code with comments for last problem using binomial coefficients, I was wrong, it's actually O(n³) and not O(n²), sorry about that.