Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the arr ...
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其他好文 时间:
2019-08-10 17:40:21
阅读次数:
92
Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j] and the ...
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其他好文 时间:
2019-08-10 17:01:29
阅读次数:
75
It is said that in 2011, there are about 100 graduate schools ready to proceed over 40,000 applications in Zhejiang Province. It would help a lot if y ...
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其他好文 时间:
2019-08-09 13:51:29
阅读次数:
95
insertintomyTable(t_id,year,details)values(5,2019,cast(‘{"haha":[{"u":1,"t":123}]}‘asjson))SELECTidFROMmyTablewhereid=4andjson_contains_path(details->‘$[*]‘,‘one‘,‘$[*].haha‘);updatemyTablesetdetai
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数据库 时间:
2019-08-08 16:05:03
阅读次数:
187
返回的值是null 测试代码 运行结果为: 从结果可以看出,HashMap集合中,获取不存在的key时并不会报异常. 在Map的实现类HashMap中有这样一段代码 在get方法中并没有向上抛出异常,注释也说明了 返回节点或者null ...
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其他好文 时间:
2019-08-08 12:53:01
阅读次数:
111
Map 键值对 * a:添加功能 V put(K key,V value):添加元素。 * 如果键是第一次存储,就直接存储元素,返回null * 如果键不是第一次存在,就用值把以前的值替换掉,返回以前的值 * b:删除功能 * void clear():移除所有的键值对元素 * V remove(O ...
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其他好文 时间:
2019-08-06 00:38:45
阅读次数:
77
1. local_date_time The constructor of boost::local_time::local_date_time expects its first parameter to be an object of type boost::posix_time::ptime ...
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其他好文 时间:
2019-08-05 19:09:28
阅读次数:
82
2019-08-03 20:31:37 Binary trees are defined recursively. A binary tree T is a structure defined on a finite set of nodes that either contains no node ...
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其他好文 时间:
2019-08-03 21:31:34
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94
The highest building in our city has only one elevator. A request list is made up with N positive numbers. The numbers denote at which floors the elev ...
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其他好文 时间:
2019-08-03 11:19:56
阅读次数:
104