摘要： Your friend has n cards. You know that each card has a lowercase English letter on one side and a digit on the other. Currently, your friend has laid 阅读全文

摘要： You are given two positive integer numbers a and b. Permute (change order) of the digits of a to construct maximal number not exceeding b. No number i 阅读全文

摘要： Luba is surfing the Internet. She currently has n opened tabs in her browser, indexed from 1 to n from left to right. The mouse cursor is currently lo 阅读全文

摘要： Jamie loves sleeping. One day, he decides that he needs to wake up at exactly hh: mm. However, he hates waking up, so he wants to make waking up less 阅读全文

摘要： Given an array a1, a2, ..., an of n integers, find the largest number in the array that is not a perfect square. A number x is said to be a perfect sq 阅读全文