Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate element must exist. Assume that there is only one duplicate number, find the duplicate one. Note: You must not modify t…
https://leetcode.com/problems/find-all-duplicates-in-an-array/ 典型的数组中的重复数.这次是通过跳转法,一个个跳转排查的.因为查过的不会重复处理,所以复杂度也是O(n). 后面发现了别人一个更好的做法...如下: public class Solution { // when find a number i, flip the number at position i-1 to negative. // if the number a…
[题目] Given a collection of integers that might contain duplicates, nums, return all possible subsets (the power set). Note: The solution set must not contain duplicate subsets. [思路] 注意sort,使得判断临接元素是否相邻. 与leetcode78类似,多了一个重复数判断条件 if(i>flag&&nums…
//效率取随机不重复数 public int[] takeRandom(int num) { Random rd = new Random(); int[] rds = new int[num];//随机数数组 List list = new ArrayList();//存放有序数字集合 int index = 0;//随机索引 for (int i = 0; i < num; i++) { list.add(i); } for (int i = 0; i < num; i++) { inde…
D. Delivery Service 单测试点时限: 2.5 秒 内存限制: 512 MB EOJ Delivery Service Company handles a massive amount of orders in our nation. As is well known, our nation has ncities, with n−1 bi-directional paths connecting them, forming a tree. The length of the i…
限量供应 Time limit per test: 4.0 seconds Time limit all tests: 4.0 seconds Memory limit: 256 megabytes 华东师大的食堂常常有许多很奇怪的菜,比方说:玉米炒葡萄.玉米炒草莓.玉米炒香蕉……所以很多同学,包括你,去食堂吃东西,是只吃菜,不吃饭的. 但这些菜都是限量供应的:如果你今天点了某一道菜,那么接下来 r 天(不包括今天)你都不能再点这道菜了.当然,同一道菜在同一天内点两份也是不可以的.此外,因为你是…
请从L=[1,10,20,50,20,20,1]中找出重复数. L=[1,10,20,50,20,20,1] L1=[] for i in L: if(L.count(i)>1): L1.append(i) L2=[] for i in L1: if i not in L2: L2.append(i) print L2…
Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. Assume that there is only one duplicate number, find the duplicate one. Example 1: Input: [1,3,4,2,2…
