VK Cup 2012 Finals, Practice Session A. Multicolored Marbles

Codeforces Round #131 (Div. 2) B. Hometask

Codeforces Round #135 (Div. 2) C. Color Stripe

Codeforces Round #139 (Div. 2) B. Well-known Numbers

Codeforces Round #143 (Div. 2) C. To Add or Not to Add

520. Detect Capital

We define the usage of capitals in a word to be right when one of the following cases holds:

• All letters in this word are capitals, like “USA”.
• All letters in this word are not capitals, like “leetcode”.
• Only the first letter in this word is capital, like “Google”.

Given a string word, return true if the usage of capitals in it is right.

F - Knapsack for All Segments

E - Yutori

F - Select Half

E - Sum of gcd of Tuples (Hard)