package leetcode // 解法一 最快的解是 DP + 单调栈 func sumSubarrayMins(A []int) int { stack, dp, res, mod := []int{}, make([]int, len(A)+1), 0, 1000000007 stack = append(stack, -1) for i := 0; i < len(A); i++ { for stack[len(stack)-1] != -1 && A[i]...
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]) ...
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. Sum of Subarray Minimums_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,要计算这样的子数组个数就会想到要计算以它...
Can you solve this real interview question? Sum of Subarray Minimums - 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 109 + 7. Ex
907. Sum of Subarray Minimums Given an array of integers A, find the sum of min(B), where B ranges over every (contiguous) subarray of A. Since the answer may be large, return the answer modulo 10^9 + 7....
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 = [...
907. Sum of Subarray Minimums 难度:m class Solution: def sumSubarrayMins(self, A: List[int]) -> int: res = 0 stack = [] for i, n in enumerate(A): while stack and A[stack[-1][0]] >= n: stack.pop() if stack: si = n*(i-stack[-1][0])+stack[-1][1] ...
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: arr = [3,1,2,4] Output: 17 Explanation: Subarrays are [3], [1], [2], ...
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,...
918. Maximum Sum Circular Subarray # 题目 # Given a circular array C of integers represented by A, find the maximum possible sum of a non-empty subarray of C. Here, a circular array means the end of the array connects to the beginning of the array. (Fo