Taxi Cab Scheme Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 5710 Accepted: 2393 Description Running a taxi station is not all that simple. Apart from the obvious demand for a centralised coordination of the cabs in order to pick up
HDU-4676 Sum Of Gcd 题意:给定一个1-N的全排列序列,N<=20000,有Q组询问,Q<=20000,每组询问给出左右区间[l, r],问区间内的任意两个数的gcd之和为多少? 分析:早几场多校做过一道题目是问任意区间的gcd最大值为多少.使用的离线加线段树的方法.这题的解题就需要一些数论知识知识了.对于任意一段区间,任意两个数的gcd值一定会是区间内某个数的因子,因此我们从因子出发,通过得到该区间内所有数的所有因子分别出现的次数,那么就有线索来求最终的答案了.例如区间内数
Given an unsorted array, find the maximum difference between the successive elements in its sorted form. Try to solve it in linear time/space. Return 0 if the array contains less than 2 elements. You may assume all elements in the array are non-negat
Problem Description This year is the 60th anniversary of NJUST, and to make the celebration more colorful, Tom200 is going to invite distinguished alumnus back to visit and take photos. After carefully planning, Tom200 announced his activity plan