摘要： Alex doesn't like boredom. That's why whenever he gets bored, he comes up with games. One long winter evening he came up with a game and decided to pl 阅读全文

摘要： The task is simple: given any positive integer N, you are supposed to count the total number of 1's in the decimal form of the integers from 1 to N. F 阅读全文

摘要： While Vasya finished eating his piece of pizza, the lesson has already started. For being late for the lesson, the teacher suggested Vasya to solve on 阅读全文

摘要： The Bitlandians are quite weird people. They do everything differently. They have a different alphabet so they have a different definition for a strin 阅读全文

摘要： Bizon the Champion isn't just charming, he also is very smart. While some of us were learning the multiplication table, Bizon the Champion had fun in 阅读全文

摘要： Dreamoon loves summing up something for no reason. One day he obtains two integers a and b occasionally. He wants to calculate the sum of all nice int 阅读全文

摘要： On his trip to Luxor and Aswan, Sagheer went to a Nubian market to buy some souvenirs for his friends and relatives. The market has some strange rules 阅读全文

摘要： On one quiet day all of sudden Mister B decided to draw angle a on his field. Aliens have already visited his field and left many different geometric 阅读全文

摘要： Polycarp thinks about the meaning of life very often. He does this constantly, even when typing in the editor. Every time he starts brooding he can no 阅读全文

摘要： Mad scientist Mike is building a time machine in his spare time. To finish the work, he needs a resistor with a certain resistance value. However, all 阅读全文