这两段区间包括2在内的所有subarray的最小值都是2,其分别可以组成的subarry的个数是 len([3])和len([4,5]),左右区间合并在一起可以组成的subarray的个数是len([3])*len([4,5]),再加上2本身自己组成一个独立的subarray [2],其总数就是 len([3]) + len([4,5]) + len([3])*len([4,5]) ...
Given an array of integers arr, find the sum ofmin(b), wherebranges over every (contiguous) subarray ofarr. Since the answer may be large, return the answer modulo109 + 7. Example 1: Input:arr = [3,1,2,4]Output:17Explanation:Subarrays are [3], [1], [2], [4], [3,1], [...
https://leetcode.com/contest/weekly-contest-102/problems/sum-of-subarray-minimums/ """ class Solution(object): def sumSubarrayMins(self, A): """ :type A: List[int] :rtype: int """ mod = 10**9 + 7 # count left = [] right = [] # (num, count) _left = [] _right = [...
si是以Ai为尾的全部子列的sum(min)。如果A[n+1]<=A[n],s[n+1]=s[n]+A[n+1],否则假设A[n+1]左边第一个比它小的数是A[i],s[n+1] = s[i] + (n+1-i)*A[i]。 这样写可能更清晰,而且快: class Solution(object): def sumSubarrayMins(self, A): MOD = 10**9 + 7 N = len(...
Given an array of integers arr, find the sum of min(b), where b ranges over every (contiguous) subarray of arr. Since the answer may be large, return the answer modulo 10**9 + 7. Example 1:Input: ar…
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No.907 Sum of Subarray Minimums,907.子数组的最小值之和-力扣(LeetCode)(leetcode-cn.com)思路参考:【LeetCode】907.SumofSubarrayMinimums_哔哩哔哩_bilibili做过较多类似题目的话很容易就想到枚举每个数字将其作为最小数时计算其所包含的子数组个数,...
I have tried 2-pointers/sliding-window but it can't handle negative cases and gives the wrong answer. Can the geniuses of CF help me out on how to approach this problem? Here is my (non working) code: publicintshortestSubarray(int[]A,intK){intptr=0;intsum=0;intsol=Integer.MAX_VALU...
the the top index k that is in the stack. A very important reason that we maintain a non-decreasing, but not strictly increasing stack, is to handle the case where there are more than 1 element of the same value that can be considered as subarrays minimum. Consider the following example...
Given an array of integersA, find the sum ofmin(B), whereBranges over every (contiguous) subarray ofA. Since the answer may be large, return the answer modulo10^9 + 7. Example 1: Input:[3,1,2,4] Output:17 Explanation: Subarrays are [3], [1], [2], [4], [3,1], [1,2...