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题目描述 Alice and Bob are always playing game! The game today is about taking out stone from the stone piles in turn. There are n piles of stones, and the i-th pile contains A[i] stones. As the number o...

题目描述 There is an array of length n, containing only positive numbers. Now you can add all numbers by 1 many times. Please find out the minimum times you need to perform to obtain an array whose great...

题目描述 Now given two integers x and y, you can reverse every consecutive three bits in arbitrary number’s binary form (any leading zero can be taken into account) using one coin. Reversing (1,2,3) mean...

题目描述 The World can indicate world travel, particularly on a large scale. You mau be lucky enough to be embarking on a six-month overseas trip, or are working, studying or living overseas for an exten...

题目描述 The Tower shows atall tower perched on the top of a rocky mountain. Lightning strikes, setting the building alight， and two people leap frnm the windows, head first and arms outstretched. It is...

题目描述 Little Sub loves triangles. Now he has a problem for you. Given n points on the two-dimensional plane, you have to answer many queries. Each query require you to calculate the number of triangle...

题目描述 Little Sub has learned a new word ’Triple’, which usually means a group with three elements in it. Now he comes up with an interesting problem for you. Define Given an positive integer sequence...

题目描述 Little Sub builds a naive Enigma machine of his own. It can only be used to encrypt/decrypt lower-case letters by giving each letter a unique corresponding lower-case letter. In order to ensure ...

题目描述 Little Sub likes Math. Now he has a simple counting problem for you. Given an positive integer sequence A, for each Ai , Please calculate how many elements Aj in the sequence satisfi ed 输入 ...