You are given an arraynumsthat consists of non-negative integers. Let us definerev(x)as the reverse of the non-negative integerx. For example,rev(123) = 321, andrev(120) = 21. A pair of indices(i, j)isniceif it satisfies all of the following conditions: ...
0-indexedinteger arraynumsof lengthnand an integerk, returnthenumber of pairs(i, j)such that: 0 <= i < j <= n - 1and nums[i] * nums[j]is divisible byk. Example 1: Input:nums = [1,2,3,4,5], k = 2Output:7Explanation:The 7 pairs of indices whose corresponding products are...
Givennums= [5, 2, 6, 1] To the right of 5 there are 2 smaller elements (2 and 1). To the right of 2 there is only 1 smaller element (1). To the right of 6 there is 1 smaller element (1). To the right of 1 there is 0 smaller element. Return the array[2, 1, 1, 0...
count(\*) 其实等于 count(0),也就是说,当你使用 count(*)时,MySQL 会将 * 参数转化为参数 0 来处理。 所以,count(*) 执行过程跟 count(1) 执行过程基本一样的,性能没有什么差异。 在MySQL 5.7 的官方手册中有这么一句话: InnoDB handles SELECT COUNT(\*) and SELECT COUNT(1) operations in the ...
}returncountAndMergeSort(sums,0, sums.size(), lower, upper); }intcountAndMergeSort(vector<long>& sums,intstart,intend,intlower,intupper) {if(end - start <=1)return0;intmid = start + (end - start) /2;intcnt = countAndMergeSort(sums, start, mid, lower, upper) +countAndMergeSort...
count(1)：这个查询与count(*)类似，统计表中的总行数。在某些情况下，count(1)可能稍微慢于count(*...
The three ranges are :[0, 0],[2, 2],[0, 2]and their respective sums are:-2, -1, 2. 题解: 题目的意思是说给了一个int array, 计算有多少subarray的sum在[lower, upper]区间内. 给的例子是index. 建立BST,每个TreeNode的val是prefix sum. 为了避免重复的TreeNode.val, 设置一个count记录多少...
packageleetcode// 解法一 线段树,时间复杂度 O(n log n)funccountRangeSum(nums[]int,lowerint,upperint)int{iflen(nums)==0{return0}st,prefixSum,sumMap,sumArray,res:=template.SegmentCountTree{},make([]int,len(nums)),make(map[int]int,0),[]int{},0prefixSum[0],sumMap[nums[0]]=nums[...
例题1 - LeetCode剑指 Offer 51. 数组中的逆序对 题目 在数组中的两个数字,如果前面一个数字大于后面的数字,则这两个数字组成一个逆序对。输入一个数组,求出这个数组中的逆序对的总数。 输入: [7,5,6,4] 输出: 5 限制:0 <= 数组长度 <= 50000 ...
13 changes: 13 additions & 0 deletions 13 2176. Count Equal and Divisible Pairs in an Array Original file line numberDiff line numberDiff line change @@ -0,0 +1,13 @@ 2176. Count Equal and Divisible Pairs in an Arrayhttps://leetcode.com/problems/count-equal-and-divisible-pairs-in-...