题目:UVALive 5881 Unique Encryption Keys
分类:线段树,想法题
题意:给出n个数,然后有q次查询,每次查询 l---r 区间内有没有重复的数,有的话输出任意的,没有的话输出ok
分析:上去一看觉得这个题目可以不用线段树做,因为它是静态的,想了一个方法后来发现时不对的,后来规规矩矩用线段树了。
这个题目不能直接用线段树,否则的话无法...
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其他好文 时间:
2014-08-15 19:42:39
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256
A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below).The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the grid (marked 'Finish' in the diag...
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其他好文 时间:
2014-08-15 09:32:37
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200
Givenn, generate all structurally uniqueBST's(binary search trees) that store values 1...n.For example,Givenn= 3, your program should return all 5 uni...
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其他好文 时间:
2014-08-14 20:16:29
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219
在model中定义public function rules(){ return array( array('Name,Email','required'), array('Email','unique','message'=>'{value...
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其他好文 时间:
2014-08-12 18:31:14
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199
Follow up for "Unique Paths":Now consider if some obstacles are added to the grids. How many unique paths would there be?An obstacle and empty space i...
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其他好文 时间:
2014-08-12 16:40:14
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157
Given a collection of numbers that might contain duplicates, return all possible unique permutations.For example, [1,1,2] have the following unique pe...
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其他好文 时间:
2014-08-12 10:17:03
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142
Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array whic...
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其他好文 时间:
2014-08-12 00:12:03
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209
The Unique MSTTime Limit:1000MSMemory Limit:10000KTotal Submissions:20430Accepted:7186DescriptionGiven a connected undirected graph, tell if its minim...
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其他好文 时间:
2014-08-12 00:09:23
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273
Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of ...
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其他好文 时间:
2014-08-11 23:52:23
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209
SQL 约束解说2009-04-27 09:29约束主要包含:NOT NULL UNIQUE PRIMARY KEY FOREIGN KEY CHECK DEFAULT 1、not null :用于控制字段的内容一定不能为空(NULL)。 使用方法 :Create table MyTable ( i...
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数据库 时间:
2014-08-11 20:55:42
阅读次数:
270