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A top-k query is a request for data from a database that involves retrieving up to k query answers ordered by a user-defined ranking function. Such a function is defined as a weighted sum over the values of the attributes of the records of interest, with the user’s preferences expressed...
}intmid = l + r >>1;if(x <= mid)add(zrt,l,mid,x,z);elseadd(yrt,mid +1,r,x,z);pushup(k); }intquery(intk,intl,intr,intx,inty){if(l >= x && r <= y)returns[k].su;intmid = l + r >>1;if(x > mid)returnquery(yrt,mid +1,r,x,y);elseif(y <= mid)return...
Top-k Query过滤器构建算法dg中第一层的所有数据放进qcandidateqcandidate设为空集flsink也设为空集如果qcandidate不为空对qcandidate中每个数据点d如果d有超过k1个决策者把它标记进md的最短的过期时间用dexpired表示把最近的超出时间的k1个点放进m把d放进flsink中对于每个d的孩子d如果d没有一个双亲节点在fl...
Definition A top-kquery is a request for data from a database that involves retrieving up tokquery answers ordered by a user-defined ranking function. Such a function is defined as a weighted sum over the values of the attributes of the records of interest, with the user’s preferences exp...
Given a sequence of n numbers a1, a2, ..., an and a number of k-queries. A k-query is a triple (i, j, k) (1 ≤ i ≤ j ≤ n). For each k-query (i, j, k), you have to return the number of elements greater than k in the subsequence ai, ai+1, ..., aj. ...
比如这题,先考虑线段树,这棵线段树的叶子都是1, 先把 所有询问按k的大小从小到大排序, 然后对于 每个询问可以把 小于当前询问k的数字的位置在线段树里置0,那么结果就是线段树的区间 求和问题来了。 这样Q次询问, 最终所有数字都加进来了 复杂度 并不高 O( N + Q * log N) ...
__k_ConstrainedTable_ID __k_ContextString_ID __k_ContextType_ID __k_DEL_ElementHandle_ID __k_DEL_IsEnabled_ID __k_DEL_LayerId_ID __k_IsDirty_ID __k_IsModeled_ID __k_ModeledQueryDebugInfo_ID __k_ModeledQueryPackData_ID __k_ModelSecPolRuntimeExId __k_Name_ID __k_Operati...
In mobile ad hoc peer to peer (M-P2P) networks, since nodes are highly resource constrained, it is effective to retrieve data items using a top-k query, in which data items are ordered by the score of a particular attribute and the query-issuing node acquires data items with the k high...
__k_ConstrainedTable_ID __k_ContextString_ID __k_ContextType_ID __k_DEL_ElementHandle_ID __k_DEL_IsEnabled_ID __k_DEL_LayerId_ID __k_IsDirty_ID __k_IsModeled_ID __k_ModeledQueryDebugInfo_ID __k_ModeledQueryPackData_ID __k_ModelSecPolRuntimeExId __k_Name_ID __k_Operatio...